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ART002107589
|
oai_dc
|
Analysis of a damaged industrial hall subjected to the effects of fire
|
Analysis of a damaged industrial hall subjected to the effects of fire
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Stanislav Kmet(Technical University of Kosice); Michal Tomko(Technical University of Kosice); Ivo Demjan(Technical University of Kosice); Ladislav Pesek(Technical University of Kosice); Sergej Priganc(Technical University of Kosice)"
] |
The results of diagnostics and analysis of an industrial hall located on the premises of a thermal power plant severely damaged by fire are presented in the paper. The comprehensive failure-related diagnostics, non-destructive and destructive tests of steel and concrete materials, geodetic surveying of selected structural members, numerical modelling, static analysis and reliability assessment were focused on two basic goals: The determination of the current technical condition of the load bearing structure and the assessment of its post fire resistance as well as assessing the degree of damage and subsequent design of reconstruction measures and arrangements which would enable the safe and reliable use of the building. The current mechanical properties of the steel material obtained from the tests and measured geometric characteristics of the structural members with imperfections were employed in finite element models to study the post-fire behaviour of the structure. In order to compare the behaviour of the numerically modelled steel roof truss, subjected to the effects of fire, with the real post-fire response of the damaged structure theoretically obtained resistance, critical temperature and the time at which the structure no longer meets the required reliability criteria under its given loading are compared with real values. A very good agreement between the simulated results and real characteristics of the structure after the fire was observed.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002107597
|
oai_dc
|
Nanotechnology, smartness and orthotropic nonhomogeneous elastic medium effects on buckling of piezoelectric pipes
|
Nanotechnology, smartness and orthotropic nonhomogeneous elastic medium effects on buckling of piezoelectric pipes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Farhad Mosharrafian(Islamic Azad University); Reza Kolahchi(Islamic Azad University)"
] |
The effects of nanotechnology and smartness on the buckling reduction of pipes are the main contributions of present work. For this ends, the pipe is simulated with classical piezoelectric polymeric cylindrical shell reinforced by armchair double walled boron nitride nanotubes (DWBNNTs), The structure is subjected to combined electro-thermo-mechanical loads. The surrounding elastic foundation is modeled with a novel model namely as orthotropic nonhomogeneous Pasternak medium. Using representative volume element (RVE) based on micromechanical modeling, mechanical, electrical and thermal characteristics of the equivalent composite are determined. Employing nonlinear strains-displacements and stress-strain relations as well as the charge equation for coupling of electrical and mechanical fields, the governing equations are derived based on Hamilton's principal. Based on differential quadrature method (DQM), the buckling load of pipe is calculated. The influences of electrical and thermal loads, geometrical parameters of shell, elastic foundation, orientation angle and volume percent of DWBNNTs in polymer are investigated on the buckling of pipe. Results showed that the generated Φ improved sensor and actuator applications in several process industries, because it increases the stability of structure. Furthermore, using nanotechnology in reinforcing the pipe, the buckling load of structure increases.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002107594
|
oai_dc
|
Non-deformable support system application at tunnel-34 of Ankara-Istanbul high speed railway project
|
Non-deformable support system application at tunnel-34 of Ankara-Istanbul high speed railway project
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"C.O. Aksoy(Dokuz Eylul University); G.G. Uyar(Hacettepe University); E. Posluk(Turkish Republic National Railway); K. Ogul(Turkish Republic National Railway); I. Topal(Dumlupınar University); K. Kucuk(Dokuz Eylul University)"
] |
Non-Deformable Support System (NDSS) is one of the support system analysis methods. It is likely seen as numerical analysis. Obviously, numerical modeling is the key tool for this system but not unique. Although the name of the system makes you feel that there is no deformation on the support system, it is not true. The system contains some deformation but in certain tolerance determined by the numerical analyses. The important question is what is the deformation tolerance? Zero deformation in the excavation environment is not the case, actually. However, deformation occurred after supporting is important. This deformation amount will determine the performance of the applied support. NDSS is a stronghold analysis method applied in full to make this work. While doing this, NDSS uses the properties of rock mass and material, various rock mass failure criteria, various material models, different excavation geometries, like other methods. The thing that differ NDSS method from the others is that NDSS makes analysis using the time dependent deformation properties of rock mass and engineering judgement. During the evaluation process, NDSS gives the permission of questioning the field observations, measurements and timedependent support performance. These transactions are carried out with 3-dimensional numeric modeling analysis. The goal of NDSS is to design a support system which does not allow greater deformation of the support system than that calculated by numerical modeling. In this paper, NDSS applied to the problems of Tunnel 34 of the same Project (excavated with NATM method, has a length of 2218 meters), which is driven in graphite schist, was illustrated. Results of the system analysis and insitu measurements successfully coincide with each other.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002107588
|
oai_dc
|
A new formulation of the J integral of bonded composite repair in aircraft structures
|
A new formulation of the J integral of bonded composite repair in aircraft structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Nassim Serier(University of SidiBel Abbes); Belaïd Mechab(University of SidiBel Abbes); Rachid Mhamdia(University of SidiBel Abbes); Boualem Serier(University of SidiBel Abbes)"
] |
A three-dimensional finite element method is used for analysis of repairing cracks in plates with bonded composite patch in elastic and elastic plastic analysis. This study was performed in order to establish an analytical model of the J-integral for repair crack. This formulation of the J-integral to establish models of fatigue crack growth in repairing aircraft structures. The model was developed by interpolation of numerical results. The obtained results were compared with those calculated with the finite element method. It was found that our model gives a good agreement of the J-integral. The arrow shape reduces the J integral at the crack tip, which improves the repair efficiency.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002107590
|
oai_dc
|
Exact deformation of an infinite rectangular plate with an arbitrarily located circular hole under in-plane loadings
|
Exact deformation of an infinite rectangular plate with an arbitrarily located circular hole under in-plane loadings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yeong-Bin Yang(Chongqing University); Jae-Hoon Kang(Chung-Ang University)"
] |
Exact solutions for stresses, strains, and displacements of a perforated rectangular plate by an arbitrarily located circular hole subjected to both linearly varying in-plane normal stresses on the two opposite edges and in-plane shear stresses are investigated using the Airy stress function. The hoop stress occurring at the edge of the non-central circular hole are computed and plotted. Stress concentration factors (the maximum non-dimensional hoop stresses) depending on the location and size of the non-central circular hole and the loading condition are tabularized.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002090668
|
oai_dc
|
Static and dynamic stability of cracked multi-storey steel frames
|
Static and dynamic stability of cracked multi-storey steel frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mustafa Sabuncu(Dokuz Eylul University); Hasan Ozturk(Dokuz Eylul University); Ahmed Yashar(Dokuz Eylul University)"
] |
Multi-storey frame structures are frequently exposed to static and dynamic forces. Therefore analyses of static (buckling) and dynamic stability come into prominence for these structures. In this study, the effects of number of storey, static and dynamic load parameters, crack depth and crack location on the in-plane static and dynamic stability of cracked multi-storey frame structures subjected to periodic loading have been investigated numerically by using the Finite Element Method. A crack element based on the Euler beam theory is developed by using the principles of fracture mechanics. The equation of motion for the cracked multi-storey frame subjected to periodic loading is achieved by Lagrange’s equation. The results obtained from the stability analysis are presented in three dimensional graphs and tables.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002090671
|
oai_dc
|
Structural damage identification based on modified Cuckoo Search algorithm
|
Structural damage identification based on modified Cuckoo Search algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H.J. Xu(Sun Yat-sen University); J.K. Liu(Sun Yat-sen University); Z.R. Lv(Sun Yat-sen University)"
] |
The Cuckoo search (CS) algorithm is a simple and efficient global optimization algorithm and it has been applied to figure out large range of real-world optimization problem. In this paper, a new formula is introduced to the discovering probability process to improve the convergence rate and the Tournament Selection Strategy is adopted to enhance global search ability of the certain algorithm. Then an approach for structural damage identification based on modified Cuckoo search (MCS) is presented. Meanwhile, we take frequency residual error and the modal assurance criterion (MAC) as indexes of damage detection in view of the crack damage, and the MCS algorithm is utilized to identifying the structural damage. A simply supported beam and a 31-bar truss are studied as numerical example to illustrate the correctness and efficiency of the propose method. Besides, a laboratory work is also conducted to further verification. Studies show that, the proposed method can judge the damage location and degree of structures more accurately than its counterpart even under measurement noise, which demonstrates the MCS algorithm has a higher damage diagnosis precision.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002090664
|
oai_dc
|
Reliability evaluation of water distribution network considering mechanical characteristics using informational entropy
|
Reliability evaluation of water distribution network considering mechanical characteristics using informational entropy
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mostafa Ghanbari Kashani(Islamic Azad University); Mahmood Hosseini(International Institute of Earthquake Engineering and Seismology); Armin Aziminejad(Islamic Azad University)"
] |
Many studies have been carried out to investigate the important factors in calculating the realistic entropy amount of water distribution networks, but none of them have considered both mechanical and hydraulic characteristics of the networks. Also, the entropy difference in various networks has not been calculated exactly. Therefore, this study suggested a modified entropy function to calculate the informational entropy of water distribution networks so that the order of demand nodes and entropy difference among various networks could be calculated by taking into account both mechanical and hydraulic characteristics of the network. This modification was performed through defining a coefficient in the entropy function as the amount of outflow at each node to all dissipated power in the network. Hence, a more realistic method for calculating entropy was presented by considering both mechanical and hydraulic characteristics of network while keeping simplicity. The efficiency of the suggested method was evaluated by calculating the entropy of some sample water networks using the modified function.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002090665
|
oai_dc
|
Dynamic shear strength of unreinforced and Hairpin-reinforced cast-in-place anchors using shaking table tests
|
Dynamic shear strength of unreinforced and Hairpin-reinforced cast-in-place anchors using shaking table tests
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김동현(부산대학교); 박용명(부산대학교); 강충현(부산대학교); 이종한(대구대학교)"
] |
Since the publication of ACI 318-02, the concrete capacity design (CCD) method has been used to determine the resistance of unreinforced concrete anchors. The regulation of steel-reinforced anchors was proposed in ACI 318-08. Until ACI 318-08, the shear resistance of concrete breakout for an unreinforced anchor during an earthquake was reduced to 75% of the static shear strength, but this reduction has been eliminated since ACI 318-11. In addition, the resistance of a hairpin-reinforced anchor was calculated using only the strength of the steel, and a regulation on the dynamic strength was not given for reinforced anchors. In this study, shaking table tests were performed to evaluate the dynamic shear strength of unreinforced and hairpin-reinforced cast-in-place (CIP) anchors during earthquakes. The anchors used in this study were 30 mm in diameter, with edge distances of 150 mm and embedment depths of 240 mm. The diameter of the hairpin steel was 10 mm. Shaking table tests were carried out on two specimens using the artificial earthquake, based on the United States Nuclear Regulatory Commission (US NRC)’s Regulatory Guide 1.60, and the Northridge earthquake. The experimental results were compared to the current ACI 318 and ETAG 001 design codes.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002090666
|
oai_dc
|
Buckling of thick deep laminated composite shell of revolution under follower forces
|
Buckling of thick deep laminated composite shell of revolution under follower forces
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Majid Khayat(Shahid Chamran University); Davood Poorveis(Shahid Chamran University); Shapour Moradi(Shahid Chamran University); Mona Hemmati(Shahid Chamran University)"
] |
Laminated composite shells are commonly used in various engineering applications including aerospace and marine structures. In this paper, using semi-analytical finite strip method, the buckling behavior of laminated composite deep as well as thick shells of revolution under follower forces which remain normal to the shell is investigated. The stiffness caused by pressure is calculated for the follower forces subjected to external fibers in thick shells. The shell is divided into several closed strips with alignment of their nodal lines in the circumferential direction. The governing equations are derived based on first-order shear deformation theory which accounts for through thickness-shear flexibility. Displacements and rotations in the middle surface of shell are approximated by combining polynomial functions in the meridional direction as well as truncated Fourier series with an appropriate number of harmonic terms in the circumferential direction. The load stiffness matrix which accounts for variation of loads direction will be derived for each strip of the shell. Assembling of these matrices results in global load stiffness matrix which may be un-symmetric. Upon forming linear elastic stiffness matrix called constitutive stiffness matrix, geometric stiffness matrix and load stiffness matrix, the required elements for the second step analysis which is an eigenvalue problem are provided. In this study, different parameter effects are investigated including shell geometry, material properties, and different boundary conditions. Afterwards, the outcomes are compared with other researches. By considering the results of this article, it can be concluded that the deformation-dependent pressure assumption can entail to decrease the calculated buckling load in shells. This characteristic is studied for different examples.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002090667
|
oai_dc
|
An experimental study and new correlations of viscosity of ethylene glycol-water based nanofluid at various temperatures and different solid concentrations
|
An experimental study and new correlations of viscosity of ethylene glycol-water based nanofluid at various temperatures and different solid concentrations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mahmood Rabani Bidgoli(Islamic Azad University); Reza Kolahchi(Islamic Azad University); Mohammad Saeed Karimi(Semnan University)"
] |
This article presents an experimental study on the effect of temperature and solid volume fraction of nanoparticles on the dynamic viscosity for the CuO/EG-water nanofluid. Nanoparticles with diameter of 40 nm are used in the present study to prepare nanofluid by two-step method. A “Brookfield viscometer” has been used to measure the dynamic viscosity of nanofluid with solid volume fraction up to 2% at the temperature range between 20 to 60°C. The findings have shown that dynamic viscosity of nanofluid increases with increasing particle volume fraction and decreasing temperature. Nine different correlations are developed on experimental data point to predict the relative dynamic viscosity of nanofluid at different temperatures. To make sure of accuracy of the proposed correlations, margin of deviation is presented at the end of this study. The results show excellent agreement between experimental data and those obtained through the correlations.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002090670
|
oai_dc
|
Self-compacting light-weight concrete; mix design and proportions
|
Self-compacting light-weight concrete; mix design and proportions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Behnam Vakhshouri(University of Technology Sydney); Shami Nejadi(University of Technology Sydney)"
] |
Utilization of mineral and chemical admixtures in concrete technology has led to changes in the formulation and mix design in recent decades, which has, in turn, made the concrete stronger and more durable. Lightweight concrete is an excellent solution in terms of decreasing the dead load of the structure, while self-compacting concrete eases the pouring and removes the construction problems. Combining the advantages of lightweight concrete and self-compacting concrete is a new and interesting research topic. Considering its light weight of structure and ease of placement, self-compacting lightweight concrete may be the answer to the increasing construction requirements of slender and more heavily reinforced structural elements. Twenty one laboratory experimental investigations published on the mix proportion, density and mechanical properties of lightweight self-compacting concrete from the last 12 years are analyzed in this study. The collected information is used to investigate the mix proportions including the chemical and mineral admixtures, light weight and normal weight aggregates, fillers, cement and water. Analyzed results are presented in terms of statistical expressions. It is very helpful for future research to choose the proper components with different ratios and curing conditions to attain the desired concrete grade according to the planned application.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002090669
|
oai_dc
|
Performance evaluation of suspended ceiling systems using shake table test
|
Performance evaluation of suspended ceiling systems using shake table test
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ozgur Ozcelik(Dokuz Eylul University); Ibrahim S. Misir(Dokuz Eylul University); Serhan Saridogan(General Directorate of State Hydraulic Works)"
] |
The national standard being used in Turkey for suspended ceiling systems (SCS) regulates material and dimensional properties but does not contain regulations regarding installation instructions which cause substandard applications of SCSs in practice. The lack of installation instructions would potentially affect the dynamic performance of these systems. Also, the vast majority of these systems are manufactured using substandard low-quality materials, and this will inevitably increase SCS related damages during earthquakes. The experimental work presented here focuses on the issue of dynamic performance of SCSs with different types of carrier systems (lay-on and clip-in systems), different weight conditions, and material-workmanship qualities. Moreover, the effects of auxiliary fastening elements, so called seismic perimeter clips, in improving the dynamic performance of SCSs were experimentally investigated. Results show that clip-in ceiling system performs better than lay-on system regardless of material and workmanship qualities. On the other hand, the quality aspect becomes the most important parameter in affecting the dynamic performance of lay-on type systems as opposed to tile weights and usage of perimeter clips. When high quality system is used, tile weight does not change the performance of lay-on system, however in poor quality system, tile weight becomes an important factor where heavier tiles considerably decrease the performance level. Perimeter clips marginally increase the dynamic performance of lay-on ceiling system, but it has no effect on the clip-in ceiling system under the shaking levels considered.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002090672
|
oai_dc
|
Rotational effect on Rayleigh, Love and Stoneley waves in non-homogeneous fibre-reinforced anisotropic general viscoelastic media of higher order
|
Rotational effect on Rayleigh, Love and Stoneley waves in non-homogeneous fibre-reinforced anisotropic general viscoelastic media of higher order
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.M. Abo-Dahab(Taif University); A.M. Abd-Alla(Taif University); Aftab Khan(Institute of Information)"
] |
In this paper, we investigated the propagation of surface waves in a nonhomogeneous rotating fibre-reinforced viscoelastic anisotropic media of higher order of nth order including time rate of strain. The general surface wave speed is derived to study the effect of rotation on surface waves. Particular cases for Stoneley, Love and Rayleigh waves are discussed. The results obtained in this investigation are more general in the sense that some earlier published results are obtained from our result as special cases. Also results for homogeneous media can be deduced from this investigation. For order zero our results are well agreed to fibre-reinforced materials. Also by neglecting the reinforced elastic parameters, the results reduce to well known isotropic medium. It is also observed that, surface waves cannot propagate in a fast rotating medium. Comparison was made with the results obtained in the presence and absence of rotation and parameters for fibre-reinforced of the material medium Numerical results are given and illustrated graphically. The results indicate that the effect of rotation and parameters for fibre-reinforced of the material are very pronounced.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002090663
|
oai_dc
|
Curvature ductility of high strength concrete beams according to Eurocode 2
|
Curvature ductility of high strength concrete beams according to Eurocode 2
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Haytham Bouzid(Université of Hassiba Benbouali of Chlef); Amar Kassoul(Université of Hassiba Benbouali of Chlef)"
] |
Recently, the high-strength concrete is increasingly used in the construction of reinforced concrete structures due to its benefits, but this use is influenced negatively on the local ductility of structural elements. The objective of this study is the prediction of a new approach to evaluate the curvature ductility factor of high strength concrete beams according to Eurocode 2. After the presentation of the Constitutive laws of materials and the evaluation method of curvature ductility according to the Eurocode 2, we conduct a parametric study on the factors influencing the curvature ductility of inflected sections. The calibrating of the obtained results allows predicting a very simple approach for estimating the curvature ductility factor. The proposed formula allows to calculate the curvature ductility factor of high strength concrete beams directly according to the concrete strength fck, the yield strength of steel fyk and the ratio of tension and compression reinforcements ρ and ρ' respectively, this proposed formula is validated by theoretical and experimental results of different researchers.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001858985
|
oai_dc
|
Stiffness modeling of RC columns reinforced with plain rebars
|
Stiffness modeling of RC columns reinforced with plain rebars
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Okan Özcan(Akdeniz University)"
] |
Inaccurate predictions of effective stiffness for reinforced concrete (RC) columns having plain (undeformed) longitudinal rebars may lead to unsafe performance assessment and strengthening of existing deficient frames. Currently utilized effective stiffness models cover RC columns reinforced with deformed longitudinal rebars. A database of 47 RC columns (33 columns had continuous rebars and the remaining had spliced reinforcement) that were longitudinally reinforced with plain rebars was compiled from literature. The existing effective stiffness equations were found to overestimate the effective stiffness of columns with plain rebars for all levels of axial loads. A new approach that considers the contributions of flexure, shear and bond slip to column deflections prior to yielding was proposed. The new effective stiffness formulations were simplified without loss of generality for columns with and without lap-spliced plain rebars. In addition, the existing stiffness models for the columns with deformed rebars were improved while taking poor bond characteristics of plain rebars into account.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001858987
|
oai_dc
|
Slenderness limit for SSTT-confined HSC column
|
Slenderness limit for SSTT-confined HSC column
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ma Chau Khun(University Technology Malaysia); Abdullah Zawawi Awang(University Technology Malaysia); Wahid Omar(University Technology Malaysia)"
] |
Due to the confinement effects, Steel-Straps Tensioning Technique (SSTT) can significantly enhance the strength and ductility of high-strength concrete (HSC) members (Moghaddam et al. 2008). However, the enhancement especially in strength may result in slender member and more susceptible toinstability (Jiang and Teng 2012a). This instability is particularly significant in HSC member as it inherent the brittle nature of the material (Galano et al. 2008). The current slenderness limit expression used in the design is mainly derived from the experiment and analysis results based on Normal strength concrete (NSC) column and therefore the direct application of these slenderness limit expressions to the HSC column is being questioned. Besides, a particular slenderness limit for the SSTT-confined HSC column which incorporated the pre-tensioned force and multilayers effects is not yet available. Hence, an analytical study was carried out in the view of developing a simple equation in order to determine the slenderness limit for HSC column confined with SSTT. Based on the analytical results, it was concluded that the existing slenderness limit expressions used in the design are appropriate for neither HSC columns nor SSTTconfined HSC columns. In this paper, a slenderness limit expression which has incorporated the SSTTconfinement effects is proposed. The proposed expression can also be applied to unconfined HSC columns.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001858983
|
oai_dc
|
Modal parameter identification of in-filled RC frames with low strength concrete using ambient vibration
|
Modal parameter identification of in-filled RC frames with low strength concrete using ambient vibration
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mehmet E. Arslan(Karadeniz Technical University); Ahmet Durmuş(Karadeniz Technical University)"
] |
In this study, modal parameters such as natural frequencies, mode shapes and damping ratios ofRC frames with low strength are determined for different construction stages using ambient vibration test.
For this purpose full scaled, one bay and one story RC frames are produced and tested for plane, brick infilledand brick in-filled with plaster conditions. Measurement time, frequency span and effective modenumber are determined by considering similar studies and literature. To obtain experimental dynamiccharacteristics, Enhanced Frequency Domain Decomposition and Stochastic Subspace Identificationtechniques are used together. It is shown that the ambient vibration measurements are enough to identify themost significant modes of RC frames. The results indicate that modal parameters change significantlydepending on the construction stages. In addition, Infill walls increase stiffness and change the mode shapesof the RC frame. There is a good agreement between mode shapes obtained from brick in-filled and in-filledwith plaster conditions. However, some differences are seen in plane frame, like expected. Dynamiccharacteristics should be verified using finite element analysis. Finally, inconsistency between experimentaland analytical dynamic characteristics should be minimize by finite element model updating using someuncertain parameters such as material properties, boundary condition and section properties to reflect thecurrent behavior of the RC frames.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001858984
|
oai_dc
|
Simulation, analysis and optimal design of fuel tank of a locomotive
|
Simulation, analysis and optimal design of fuel tank of a locomotive
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Karkhaneh Yousefi(Isfahan University of Technology); H. Nahvi(Isfahan University of Technology); M. Shariat Panahi(University of Tehran)"
] |
In this paper, fuel tank of the locomotive ER 24 has been studied. Firstly the behavior of fuel and air during the braking time has been investigated by using a two-phase model. Then, the distribution of pressure on the surface of baffles caused by sloshing has been extracted. Also, the fuel tank has been modeled and analyzed using Finite Element Method (FEM) considering loading conditions suggested by the DIN EN 12663 standard and real boundary conditions. In each loading condition, high stressed areas havebeen identified. By comparing the distribution of pressure caused by sloshing phenomena and suggested loading conditions, optimization of the tank has been taken into consideration. Moreover, internal baffles have been investigated and by modifying their geometric properties, search of the design space has been done to reach the optimal tank. Then, in order to reduce the mass and manufacturing cost of the fuel tank, Non-dominated Sorting Genetic Algorithm (NSGA-II) and Artificial Neural Networks (ANNs) have been employed. It is shown that compared to the primary design, the optimized fuel tank not only provides the safety conditions, but also reduces mass and manufacturing cost by %39 and %73, respectively.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001858986
|
oai_dc
|
Is it shear locking or mesh refinement problem?
|
Is it shear locking or mesh refinement problem?
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Y.I. Özdemir(Karadeniz Technical University); Y. Ayvaz(Karadeniz Technical University)"
] |
Locking phenomenon is a mesh problem and can be staved off with mesh refinement. If the studier is not preferred going to the solution with increasing mesh size or the computer memory can stack over flow than using higher order plate finite element or using integration techniques is a solution for this problem. The purpose of this paper is to show the shear locking phenomenon can be avoided by increase low order finite element mesh size of the plates and to study shear locking-free analysis of thick plates using Mindlin’s theory by using higher order displacement shape function and to determine the effects of various parameters such as the thickness/span ratio, mesh size on the linear responses of thick plates subjected to uniformly distributed loads. A computer program using finite element method is coded in C++ to analyze the plates clamped or simply supported along all four edges. In the analysis, 4-, 8- and 17-noded quadrilateral finite elements are used. It is concluded that 17-noded finite element converges to exact results much faster than 8-noded finite element, and that it is better to use 17-noded finite element for shear-locking free analysis of plates.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001858988
|
oai_dc
|
Seismic performance and its favorable structural system of three-tower suspension bridge
|
Seismic performance and its favorable structural system of three-tower suspension bridge
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xin-Jun Zhang(Zhejiang University of Technology); Guo-Ning Fu(Zhejiang University of Technology)"
] |
Due to the lack of effective longitudinal constraint for center tower, structural stiffness of three-tower suspension bridge becomes less than that of two-tower suspension bridge, and therefore it becomes more susceptible to the seismic action. By taking a three-tower suspension bridge-the Taizhou Highway Bridge over the Yangtze River with two main spans of 1080 m as example, structural dynamiccharacteristics and seismic performance of the bridge is investigated, and the effects of cable’s sag to span ratio, structural stiffness of the center tower, and longitudinal constraint of the girder on seismic response of the bridge are also investigated, and the favorable structural system is discussed with respect to seismic performance. The results show that structural response under lateral seismic action is more remarkable, especially for the side towers, and therefore more attentions should be paid to the lateral seismicperformance and also the side towers. Large cable’s sag, flexible center tower and the longitudinal elastic cable between the center tower and the girder are favorable to improve structural seismic performance of long-span three-tower suspension bridges.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001858989
|
oai_dc
|
Fatigue modeling of chopped strand mat/epoxy composites
|
Fatigue modeling of chopped strand mat/epoxy composites
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.M. Shokrieh(Iran University of Science and Technology); M. Esmkhani(Iran University of Science and Technology); F. Taheri-Behrooz(Iran University of Science and Technology)"
] |
In the present research, fatigue behavior of chopped strand mat/epoxy composites has beenstudied with two different techniques. First, the normalized stiffness degradation approach as a well-known model for unidirectional and laminated composites was utilized to predict the fatigue behavior of chopped strand mat/epoxy composites. Then, the capability of the fatigue damage accumulation model for chopped strand mat/epoxy composites was investigated. A series of tests has been performed at different stress levels to evaluate both models with the obtained results. The results of evaluation indicate a better correlation of the normalized stiffness degradation technique with experimental results in comparison with the fatigue damage accumulation model.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001858990
|
oai_dc
|
Responses of self-anchored suspension bridge to sudden breakage of hangers
|
Responses of self-anchored suspension bridge to sudden breakage of hangers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wenliang Qiu(Dalian University of Technology); Meng Jiang(Dalian University of Technology); Zhe Zhang(Dalian University of Technology)"
] |
The girder of self-anchored suspension bridge is subjected to large compression force applied by main cables. So, serious damage of the girder due to breakage of hangers may cause collapse of the wholebridge. With the time increasing, the hangers may break suddenly for their resistance capacities decrease due to corrosion. Using nonlinear static and dynamic analysis methods and adopting 3D finite element model, the responses of a concrete self-anchored suspension bridge to sudden breakage of hangers are studied in this paper. The results show that the sudden breakage of a hanger has significant effects on tensions of the hangers next to the broken hanger, bending and torsion moments of the girder, moments of the towers and reaction forces of the bearings. The results obtained from dynamic analysis method are very different from those obtained from static analysis method. The maximum tension of hanger produced by breakage of a hanger exceeds 2.2 times of its initial value, the maximum dynamic amplification factor reaches 2.54, which is larger than the value of 2.0 recommended for cable-stayed bridge in PTI codes. If two adjacent hangers onthe same side of bridge break one after another, the maximum tension of other hangers exceeds 3.0 times of its initial value. If the safety factor adopted to design hanger is too small, or the hangers have been exposed to corrosion, the bridge may collapse due to breakage of two adjacent hangers.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002109205
|
oai_dc
|
The effects of foundation size on the seismic performance of buildings considering the soil-foundation-structure interaction
|
The effects of foundation size on the seismic performance of buildings considering the soil-foundation-structure interaction
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Quoc Van Nguyen(University of Technology Sydney (UTS)); Behzad Fatahi(University of Technology Sydney (UTS)); Aslan S. Hokmabadi(Ove Arup & Partners)"
] |
Shallow footings are one of the most common types of foundations used to support mid-rise buildings in high risk seismic zones. Recent findings have revealed that the dynamic interaction between the soil, foundation, and the superstructure can influence the seismic response of the building during earthquakes. Accordingly, the properties of a foundation can alter the dynamic characteristics (natural frequency and damping) of the soil-foundation-structure system. In this paper the influence that shallow foundations have on the seismic response of a mid-rise moment resisting building is investigated. For this purpose, a fifteen storey moment resisting frame sitting on shallow footings with different sizes was simulated numerically using ABAQUS software. By adopting a direct calculation method, the numerical model can perform a fully nonlinear time history dynamic analysis to realistically simulate the dynamic behaviour of soil, foundation, and structure under seismic excitations. This three-dimensional numerical model accounts for the nonlinear behaviour of the soil medium and structural elements. Infinite boundary conditions were assigned to the numerical model to simulate free field boundaries, and appropriate contact elements capable of modelling sliding and separation between the foundation and soil elements are also considered. The influence of foundation size on the natural frequency of the system and structural response spectrum was also studied. The numerical results for cases of soil-foundation-structure systems with different sized foundations and fixed base conditions (excluding soil-foundation-structure interaction) in terms of lateral deformations, inter-storey drifts, rocking, and shear force distribution of the structure were then compared. Due to natural period lengthening, there was a significant reduction in the base shears when the size of the foundation was reduced. It was concluded that the size of a shallow foundation influences the dynamic characteristics and the seismic response of the building due to interaction between the soil, foundation, and structure, and therefore design engineer should carefully consider these parameters in order to ensure a safe and cost effective seismic design.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002109207
|
oai_dc
|
Usability of inclinometers as a complementary measurement tool in structural monitoring
|
Usability of inclinometers as a complementary measurement tool in structural monitoring
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hüseyin Pehlivan(Gebze Technical University); Halim Ferit Bayata(Erzincan University)"
] |
In the last few years, many structural monitoring studies have been performed using different techniques to measure structures of different scales such as buildings, dams or bridges. One of the mostly used tools are GPS instruments, which have been utilized in various combinations with accelerometers and some other conventional sensors. In the current study, observation series were recorded for 8 hours with GPS receivers (NovAtel) and Inclination Measurement Sensors mounted on a television tower in Istanbul, Turkey. Each series of observations collected from two different sensors were transformed into a single coordinate system (Local Topocentric Coordinates System). The positional changes of the tower were calculated from the GPS and the inclination data. These changes were plotted in two dimensions (2D) on the same graphic. Thus, the possibility of comparison and analysis were found using the data from both the GPS and the Inclinometer complement each other, in the real test area. The positional changes of the tower were modeled for further examination. As a result, the movement of the tower within an area of 1×1 cm2 was observed. Based on the results, it can be concluded that inclinometers can be used for monitoring the structural behavior of the tower.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002109211
|
oai_dc
|
Multicracks identification in beams based on moving harmonic excitation
|
Multicracks identification in beams based on moving harmonic excitation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hajar Chouiyakh(Abdelmalek Essaâdi University); Lahcen Azrar(Abdelmalek Essaâdi University); Khaled Alnefaie(King Abdulaziz University); Omar Akourri(Abdelmalek Essaâdi University)"
] |
A method of damage detection based on the moving harmonic excitation and continuous wavelet transforms is presented. The applied excitation is used as a moving actuator and its frequency and speed parameters can be adjusted for an amplified response. The continuous wavelet transforms, CWT, is used for cracks detection based on the resulting amplified signal. It is demonstrated that this identification procedure is largely better than the classical ones based on eigenfrequencies or on the eigenmodes wavelet transformed. For vibration responses, free and forced vibration analyses of multi-cracked beams are investigated based on both analytical and numerical methodological approaches. Cracks are modeled through rotational springs whose compliances are evaluated using linear elastic fracture mechanics. Based on the obtained forced responses, multi-cracks positions are accurately identified and the CWT identification can be highly improved by adjusting the frequency and the speed excitation parameters.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002109212
|
oai_dc
|
Optimal design of double layer barrel vaults considering nonlinear behavior
|
Optimal design of double layer barrel vaults considering nonlinear behavior
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Saeed Gholizadeh(Urmia University); Changiz Gheyratmand(Urmia University); Hamed Davoudi(Urmia University)"
] |
The present paper focuses on size optimization of double layer barrel vaults considering nonlinear behavior. In order to tackle the optimization problem an improved colliding bodies optimization (ICBO) algorithm is proposed. The important task that should be achieved before optimization of structural systems is to determine the best form having the least cost. In this study, an attempt is done to find the best form then it is optimized considering linear and non-linear behaviors. In the optimization process based on nonlinear behavior, the geometrical and material nonlinearity effects are included. A large-scale double layer barrel vault is presented as the numerical example of this study and the obtained results indicate that the proposed ICBO has better computational performance compared with other algorithms.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002109198
|
oai_dc
|
Wind load effects and equivalent static wind loads of three-tower connected tall buildings based on wind tunnel tests
|
Wind load effects and equivalent static wind loads of three-tower connected tall buildings based on wind tunnel tests
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shitang Ke(Nanjing University of Aeronautics and Astronautics); Hao Wang(Nanjing University of Aeronautics and Astronautics); Yaojun Ge(Tongji University)"
] |
Due to the significant aerodynamic interference from sub-towers and surrounding tall buildings, the wind loads and dynamic responses on main tower of three-tower connected tall building typically change especially compared with those on the isolated single tall building. This paper addresses the wind load effects and equivalent static wind loads (ESWLs) of three-tower connected tall building based on measured synchronous surface pressures in a wind tunnel. The variations of the global shape coefficients and extremum wind loads of main tower structure with or without interference effect under different wind directions are studied, pointing out the deficiency of the traditional wind loads based on the load codes for the three-tower connected tall building. The ESWLs calculation method based on elastic restoring forces is proposed, which completely contains the quasi-static item, inertia item and the coupled effect between them.
Then the wind-induced displacement and acceleration responses for main tower of three-tower connected tall building in the horizontal and torsional directions are investigated, subsequently the structural basal and floor ESWLs under different return periods, wind directions and damping ratios are studied. Finally, the action mechanism of interference effect on structural wind effects is investigated. Main conclusions can provide a sientific basis for the wind-resistant design of such three-tower connected tall building.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002109195
|
oai_dc
|
Effect of higher order terms of Maclaurin expansion in nonlinear analysis of the Bernoulli beam by single finite element
|
Effect of higher order terms of Maclaurin expansion in nonlinear analysis of the Bernoulli beam by single finite element
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Seyed Mehdi Zahrai(The University of Tehran); Mohamad Hosein Mortezagholi(The University of Tehran); Maryam Mirsalehi(Isfahan University of Technology)"
] |
The second order analysis taking place due to non-linear behavior of the structures under the mechanical and geometric factors through implementing exact and approximate methods is an indispensible issue in the analysis of such structures. Among the exact methods is the slope-deflection method that due to its simplicity and efficiency of its relationships has always been in consideration. By solving the differential equations of the modified slope–deflection method in which the effect of axial compressive force is considered, the stiffness matrix including trigonometric entries would be obtained. The complexity of computations with trigonometric functions causes replacement with their Maclaurin expansion. In most cases only the first two terms of this expansion are used but to obtain more accurate results, more elements are needed. In this paper, the effect of utilizing higher order terms of Maclaurin expansion on reducing the number of required elements and attaining more rapid convergence with less error is investigated for the Bernoulli beam with various boundary conditions. The results indicate that when using only one element along the beam length, utilizing higher order terms in Maclaurin expansion would reduce the relative error in determining the critical buckling load and kinematic parameters in the second order analysis.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002109199
|
oai_dc
|
Prediction of compressive strength of concrete based on accelerated strength
|
Prediction of compressive strength of concrete based on accelerated strength
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"N.L. Shelke(Sardar Patel College of Engineering); Sangeeta Gadve(Visvesvaraya National Institute of Technology (VNIT))"
] |
Moist curing of concrete is a time consuming procedure. It takes minimum 28 days of curing to obtain the characteristic strength of concrete. However, under certain situations such as shortage of time, weather conditions, on the spot changes in project and speedy construction, waiting for entire curing period becomes unaffordable. This situation demands early strength of concrete which can be met using accelerated curing methods. It becomes necessary to obtain early strength of concrete rather than waiting for entire period of curing which proves to be uneconomical. In India, accelerated curing methods are used to arrive upon the actual strength by resorting to the equations suggested by Bureau of Indian Standards’ (BIS). However, it has been observed that the results obtained using above equations are exaggerated. In the present experimental investigations, the results of the accelerated compressive strength of the concrete are used to develop the regression models for predicting the short term and long term compressive strength of concrete. The proposed regression models show better agreement with the actual compressive strength than the existing model suggested by BIS specification.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002109200
|
oai_dc
|
Vibration analysis of a shear deformed anti-symmetric angle-ply conical shells with varying sinusoidal thickness
|
Vibration analysis of a shear deformed anti-symmetric angle-ply conical shells with varying sinusoidal thickness
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Saira Javed(Universiti Teknologi Malaysia); K.K. Viswanathan(Universiti Teknologi Malaysia); Z.A. Aziz(Universiti Teknologi Malaysia); J.H. Lee(Inha University)"
] |
The study is to investigate the free vibration of antisymmetric angle-ply conical shells having non-uniform sinusoidal thickness variation. The arbitrarily varying thickness is considered in the axial direction of the shell. The vibrational behavior of shear deformable conical shells is analyzed for three different support conditions. The coupled differential equations in terms displacement and rotational functions are obtained. These displacement and rotational functions are invariantly approximated using cubic spline. A generalized eigenvalue problem is obtained and solved numerically for an eigenfrequency parameter and an associated eigenvector of spline coefficients. The vibration characteristic of the shells is examined for cone angle, aspect ratio, sinusoidal thickness variation, layer number, stacking sequence, and boundary conditions.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002109204
|
oai_dc
|
Damage and fatigue quantification of RC structures
|
Damage and fatigue quantification of RC structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kabir Sadeghi(Near East University); Fatemeh Nouban(Near East University)"
] |
Different versions of a damage index (DI) along with a formulation to find the number of cycles at failure due to fatigue, applicable to reinforced concrete (RC) structures are presented. These are based on an energetic analysis method and applicable to both global and local levels. The required data can be found either from the numerical simulation of structures or from the experimental tests. A computer program has been developed to simulate numerically the nonlinear behavior of RC columns under cyclic loading. The proposed DI gives a regular distribution of structural damages up to failure and is validated by the results of the tests carried out on RC columns subjected to cyclic loading. In general, the local and global damage indices give approximately similar results, while each of them has its own advantages. The advantage of the implicit version of DI is that, it allows the comparison of the results with those of the monotonic loading case, while the explicit version makes it possible to estimate the number of loading cycles at failure due to fatigue, and the advantage of the simplified version is that; the monotonic loading data is not needed for the cyclic loading case.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002109216
|
oai_dc
|
Time delay study for semi-active control of coupled adjacent structures using MR damper
|
Time delay study for semi-active control of coupled adjacent structures using MR damper
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Javad Katebi(University of Tabriz); Samira Mohammady Zadeh(University of Tabriz)"
] |
The pounding phenomenon in adjacent structures happens in severing earthquakes that can cause great damages. Connecting neighboring structures with active and semi-active control devices is an effective method to avoid mutual colliding between neighboring buildings. One of the most important issues in control systems is applying online control force. There will be a time delay if the prose of producing control force does not perform on time. This paper proposed a time-delay compensation method in coupled structures control, with semi-active Magnetorheological (MR) damper. This method based on Newmark’s integration is adopted to mitigate the time-delay effect. In this study, Lyapunov's direct approach is employed to compute demanded voltage for MR dampers. Using Lyapunov's direct algorithm guarantees the system stability to design a controller based on feedback. Because of the strong nonlinearity of MR dampers, the equation of motion of coupled structures becomes an involved equation, and it is impossible to solve it with the common time step methods. In present paper modified Newmark-Beta integration based on the instantaneous optimal control algorithm, used to solve the involved equation. In this method, the response of a coupled system estimated base on optimal control force. Two MDOF structures with different degrees of freedom are finally considered as a numeric example. The numerical results show, the Newmark compensation is an efficient method to decrease the negative effect of time delay in coupled systems; furthermore, instantaneous optimal control algorithm can estimate the response of structures suitable.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002077485
|
oai_dc
|
Seismic vulnerbility analysis of Bankstown’s West Terrace railway bridge
|
Seismic vulnerbility analysis of Bankstown’s West Terrace railway bridge
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Olivia Mirza(Western Sydney University); Sakdirat Kaewunruen(the University of Birmingham); Darren Galia(Marten and Associate)"
] |
This paper highlights a case study that investigates the behaviour of existing bridge, West Terrace Bridge, induced by horizontal seismic loading. Unfortunately the lack of past information related to seismic activity within the NSW region has made it difficult to understand better the capacity of the structure if Earthquake occurs. The research was conducted through the University of Western Sydney in conjunction with Railcorp Australia, as part of disaster reduction preparedness program. The focus of seismic analyses was on the assessment of stress behaviour, induced by cyclic horizontal/vertical displacements, within the concrete slab and steel truss of the bridge under various Earthquake Year Return Intervals (YRI) of 1-100, 1- 200, 1-250, 1-500, 1-800, 1-1000, 1-1500, 1-2000 and 1-2500. Furthermore the stresses and displacements were rigorously analysed through a parametric study conducted using different boundary conditions. The numerical analysis of the concrete slab and steel truss were performed through the finite element software, ABAQUS. The field measurements and observation had been used to validate the results drawn from the finite element simulation. It was illustrated that under a YRI of 1/1000 the bottom chord of the steel truss failed as the stress induced surpassed the ultimate stress capacity and the horizontal displacement exceeded the allowable displacement measured in the field observations whereas the vertical displacement remained within the previously observed limitations. Furthermore the parametric studies in this paper demonstrate that a change in boundary conditions alleviated the stress distribution throughout the structure allowing it to withstand a greater load induced by the earthquake YRI but ultimately failed when the maximum earthquake loading was applied. Therefore it was recommended to provide a gap of 50mm on the end of the concrete slab to allow the structure to displace without increasing the stress in the structure. Finally, this study has proposed a design chart to showcase the failure mode of the bridge when subjected to seismic loading.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002077470
|
oai_dc
|
Significance of seabed interaction on fatigue assessment of steel catenary risers in the touchdown zone
|
Significance of seabed interaction on fatigue assessment of steel catenary risers in the touchdown zone
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hany Elosta(FORSYS SUBSEA An FMC Technologies and Technip Company); Shan Huang(University of Strathclyde,); Atilla Incecik(University of Strathclyde)"
] |
The challenges involved with fatigue damage assessment of steel catenary riser (SCR) in the touchdown zone (TDZ) are primarily due to the non-linear behaviour of the SCR-seabed interaction, considerable uncertainty in SCR-seabed interaction modelling and geotechnical parameters. The issue of fatigue damage induced by the cyclic movements of the SCR with the seabed has acquired prominence with the touch down point (TDP) interaction in the TDZ. Therefore, the SCR-seabed response is critical for reliable estimation of fatigue life in the TDZ. Various design approaches pertaining to the lateral pipe-soil resistance model are discussed. These techniques have been applied in the finite element model that can be used to analyse the lateral SCR-seabed interaction under hydrodynamic loading. This study investigates the sensitivity of fatigue performance to geotechnical parameters through a parametric study. In this study, global analyses are performed to assess the influence of vertical linear seabed springs, the lateral seabed model and the non-linear seabed model, including trench evolution into seabed, seabed normalised stiffness, re-penetration offset parameter and soil suction resistance ratio, on the fatigue life of SCRs in the TDZ.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002077473
|
oai_dc
|
Wave propagation in functionally graded composite cylinders reinforced by aggregated carbon nanotube
|
Wave propagation in functionally graded composite cylinders reinforced by aggregated carbon nanotube
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rasool Moradi-Dastjerdi(Islamic Azad University)"
] |
This work reports wave propagation in the nanocomposite cylinders that reinforced by straight single-walled carbon nanotubes based on a mesh-free method. Moving least square shape functions have been used for approximation of displacement field in weak form of motion equation. The straight carbon nanotubes (CNTs) are assumed to be oriented in specific or random directions or locally aggregated into some clusters. In this simulation, an axisymmetric model is used and also the volume fractions of the CNTs and clusters are assumed to be functionally graded along the thickness. So, material properties of the carbon nanotube reinforced composite cylinders are variable and estimated based on the Eshelby-Mori-Tanaka approach. The effects of orientation, aggregation and volume fractions of the functionally graded clusters and CNTs on dynamic behavior of nanocomposite cylinders are studied. This study results show that orientation and aggregation of CNTs have significant effects on the effective stiffness and dynamic behaviors.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002077467
|
oai_dc
|
The finite element model research of the pre-twisted thin-walled beam
|
The finite element model research of the pre-twisted thin-walled beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chang Hong Chen(Northwestern Polytechnical University); Yan Fei Zhu(Northwestern Polytechnical University); Yao Yao(Northwestern Polytechnical University); Ying Huang(Xi’an University of Architecture and Technology)"
] |
Based on the traditional mechanical model of thin-walled straight beam, the paper makes analysis and research on the pre-twisted thin-walled beam finite element numerical model. Firstly, based on the geometric deformation differential relationship, the Saint-Venant warping strain of pre-twisted thin-walled beam is deduced. According to the traditional thin-walled straight beam finite element mechanical model, the finite element stiffness matrix considering the Saint-Venant warping deformations is established. At the same time, the paper establishes the element stiffness matrix of the pre-twisted thin-walled beam based on the classic Vlasov Theory. Finally, by calculating the pre-twisted beam with elliptical section and I cross section and contrasting three-dimensional solid finite element using ANSYS, the comparison analysis results show that pre-twisted thin-walled beam element stiffness matrix has good accuracy.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002077478
|
oai_dc
|
Numerical investigation seismic performance of rigid skewed beam-to-column connection with reduced beam section
|
Numerical investigation seismic performance of rigid skewed beam-to-column connection with reduced beam section
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ali Zarei(Persian Gulf University); Mohammad Vaghefi(Persian Gulf University); Ali R. Fiouz(Persian Gulf University)"
] |
Reduced beam section (RBS) moment resisting connections are among the most economical and practical rigid steel connections developed in the aftermath of the 1994 Northridge and the 1995 Kobe earthquakes. Although the performance of RBS connection has been widely studied, this connection has not been subject to in the skewed conditions. In this study, the seismic performance of dogbone connection was investigated at different angles. The Commercial ABAQUS software was used to simulate the samples. The numerical results are first compared with experimental results to verify the accuracy. Nonlinear static analysis with von Mises yield criterion materials and the finite elements method were used to analyze the behavior of the samples The selected Hardening Strain of materials at cyclic loading and monotonic loading were kinematics and isotropic respectively The results show that in addition to reverse twisting of columns, change in beam angle relative to the central axis of the column has little impact on hysteresis response of samples. Any increase in the angle, leads to increased non-elastic resistance. As for Weak panel zone, with increase of the angle between the beam and the column, the initial submission will take place at a later time and at a larger rotation angle in the panel zone and this represents reduced amount of perpendicular force exerted on the column flange. In balanced and strong panel zones, with increase in the angle between the beam and the central axis of the column, the reduced beam section (RBS), reaches the failure limit faster and at a lower rotation angle. In connection of skewed beam, balanced panel zone, due to its good performance in disposition of plasticity process away from connection points and high energy absorption, is the best choice for panel zone. The ratio of maximum moment developed on the column was found to be within 0.84 to 1 plastic anchor point, which shows prevention of brittle fracture in connections.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002077476
|
oai_dc
|
Development of a 2D isoparametric finite element model based on the layerwise approach for the bending analysis of sandwich plates
|
Development of a 2D isoparametric finite element model based on the layerwise approach for the bending analysis of sandwich plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohamed-Ouejdi Belarbi(Université de Biskra); Abdelouahab Tati(Université de Biskra); Houdayfa Ounis(Université de Biskra); Adel Benchabane(Université de Biskra)"
] |
The aim of this work is the development of a 2D quadrilateral isoparametric finite element model, based on a layerwise approach, for the bending analysis of sandwich plates. The face sheets and the core are modeled individually using, respectively, the first order shear deformation theory and the third-order plate theory. The displacement continuity condition at the interfaces „face sheets-core‟ is satisfied. The assumed natural strains method is introduced to avoid an eventual shear locking phenomenon. The developed element is a four-nodded isoparametric element with fifty two degrees-of-freedom (52 DOF).
Each face sheet has only two rotational DOF per node and the core has nine DOF per node: six rotational degrees and three translation components which are common for the all sandwich layers. The performance of the proposed element model is assessed by six examples, considering symmetric/unsymmetric composite sandwich plates with different aspect ratios, loadings and boundary conditions. The numerical results obtained are compared with the analytical solutions and the numerical results obtained by other authors. The results indicate that the proposed element model is promising in terms of the accuracy and the convergence speed for both thin and thick plates.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002077482
|
oai_dc
|
Buckling and vibration behavior of a non-uniformly heated isotropic cylindrical panel
|
Buckling and vibration behavior of a non-uniformly heated isotropic cylindrical panel
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Vinod S. Bhagat(National Institute of Technology Karnataka); Jeyaraj Pitchaimani(National Institute of Technology Karnataka); S.M. Murigendrappa(National Institute of Technology Karnataka)"
] |
This study attempts to address the buckling and free vibration characteristics of an isotropic cylindrical panel subjected to non-uniform temperature rise using numerical approach. Finite element analysis has been used in the present study. The approach involves three parts, in the first part non-uniform temperature field is obtained using heat transfer analysis, in the second part, the stress field is computed under the thermal load using static condition and, the last part, the buckling and pre-stressed modal analysis are carried out to compute critical buckling temperature as well as natural frequencies and associated mode shapes. In the present study, the effect of non-uniform temperature field, heat sink temperatures and in-plane boundary constraints are considered. The relation between buckling temperature under uniform and nonuniform temperature fields has been established. Results revealed that decrease (Case (ii)) type temperature variation field influences the fundamental buckling mode shape significantly. Further, it is observed that natural frequencies under free vibration state, decreases as temperature increases. However, the reduction is significantly higher for the lowest natural frequency. It is also found that, with an increase in temperature, nodal and anti-nodal positions of free vibration mode shapes is shifting towards the location where the intensity of the heat source is high and structural stiffness is low.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002077480
|
oai_dc
|
Fractal behavior identification for monitoring data of dam safety
|
Fractal behavior identification for monitoring data of dam safety
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Huaizhi Su(Hohai University); Zhiping Wen(Nanjing Institute of Technology); Feng Wang(Hohai University)"
] |
Under the interaction between dam body, dam foundation and external environment, the dam structural behavior presents the time-varying nonlinear characteristics. According to the prototypical observations, the correct identification on above nonlinear characteristics is very important for dam safety control. It is difficult to implement the description, analysis and diagnosis for dam structural behavior by use of any linear method. Based on the rescaled range analysis approach, the algorithm is proposed to identify and extract the fractal feature on observed dam structural behavior. The displacement behavior of one actual dam is taken as an example. The fractal long-range correlation for observed displacement behavior is analyzed and revealed. The feasibility and validity of the proposed method is verified. It is indicated that the mechanism evidence can be provided for the prediction and diagnosis of dam structural behavior by using the fractal identification method. The proposed approach has a high potential for other similar applications.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002077471
|
oai_dc
|
Investigation of fresh concrete behavior under vibration using mass-spring model
|
Investigation of fresh concrete behavior under vibration using mass-spring model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gultekin Aktas(Dicle University)"
] |
This paper deals with the behavior of fresh concrete that is under vibration using mass-spring model (MSM). To this end, behaviors of two different full scale precast concrete molds were investigated experimentally and theoretically. Experiments were performed under vibration with the use of a computerbased data acquisition system. Transducers were used to measure time-dependent lateral displacements at some points on mold while mold is empty and full of fresh concrete. Analytical modeling of molds used in experiments were prepared by three dimensional finite element method (3D FEM) using software. Modeling of full mold, using MSM, was made to solve the problem of dynamic interaction between fresh concrete and mold. Numerical displacement histories obtained from time history analysis were compared with experimental results. The comparisons show that the measured and computed results are compatible.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002077474
|
oai_dc
|
C0-type Reddy’s theory for composite beams using FEM under thermal loads
|
C0-type Reddy’s theory for composite beams using FEM under thermal loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xiaoyan Fan(Shenyang Aerospace University); Zhen Wu(Shenyang Aerospace University)"
] |
To analyze laminated composite and sandwich beams under temperature loads, a C0-type Reddy’s beam theory considering transverse normal strain is proposed in this paper. Although transverse normal strain is taken into account, the number of unknowns is not increased. Moreover, the first derivatives of transverse displacement have been taken out from the in-plane displacement fields, so that the C0 interpolation functions are only required for the finite element implementation. Based on the proposed model, a three-node beam element is presented for analysis of thermal responses. Numerical results show that the proposed model can accurately and efficiently analyze the thermoelastic problems of laminated composites.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002029719
|
oai_dc
|
Damping of a taut cable with two attached high damping rubber dampers
|
Damping of a taut cable with two attached high damping rubber dampers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Viet Hung Cu(Beijing Jiaotong University); Bing Han(National University of Civil Engineering); Fang Wang(China Railway Corporation)"
] |
Due to their low intrinsic damping, stay cables in cable-stayed bridges have often exhibited unanticipated and excessive vibrations which result in increasing maintenance frequency and disruption to normal operations of the entire bridges. Mitigation of undesired cable vibration can be achieved by attaching an external damping device near the anchorage. High Damping Rubber (HDR) dampers have many advantages such as compact size, better aesthetics, easy maintenance, temperature stability, and cost benefits; therefore, they have been widely used to increase cable damping. Although a single damper has been shown to reduce cable vibrations, it is not the most effective method due to geometric constraints. This paper proposes the use of two HDR dampers to improve effectiveness and robustness in suppressing cable vibration. Oscillation parameters of the cable-dampers system were investigated in detail by modeling the stay cable as a taut string and each HDR damper as complex-valued impedance and by using an analytical formulation of the complex eigenvalue problem. The problem of two HDR dampers arbitrarily located along a cable is solved and the solution is discussed. Asymptotic formulas to calculate the damping ratios of the cable with two HDR dampers installed near the anchorage(s) are proposed and compared with the exact solutions. Further, a design example is presented in order to justify the methodology. The results of this study show that when the two HDR dampers are installed close to each other on the same end of the cable, some interaction between the dampers leads to reduced damping ratio. When the dampers are on the opposite ends of the cable, they are effective in increasing damping ratio and can provide better vibration reduction to multiple modes.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002029714
|
oai_dc
|
Study of seismic performance of cable-stayed-suspension hybrid bridges
|
Study of seismic performance of cable-stayed-suspension hybrid bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xin-Jun Zhang(Zhejiang University of Technology); Zhou-Jun Yu(Zhejiang University of Technology)"
] |
By taking a cable-stayed-suspension hybrid bridge with main span of 1400 m as example, seismic response of the bridge under the horizontal and vertical seismic excitations is investigated numerically by response spectrum analysis and time history analysis, its seismic performance is discussed and compared to the cable-stayed bridge and suspension bridge with the same main span, and considering the aspect of seismic performance, the feasibility of using cable-stayed-suspension hybrid bridge in super long-span bridges is discussed. Under the horizontal seismic action, the effects of structural design parameters including the cable sag to span ratio, the suspension to span ratio, the side span length, the subsidiary piers in side spans, the girder supporting system and the deck form etc on the seismic performance of the bridge are investigated by response spectrum analysis, and the favorable values of these design parameters are proposed.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002029703
|
oai_dc
|
Stress intensity factor calculation for semi-elliptical cracks on functionally graded material coated cylinders
|
Stress intensity factor calculation for semi-elliptical cracks on functionally graded material coated cylinders
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Peyman Farahpour(Islamic Azad University); Vahid Babaghasabha(Islamic Azad University); Mahdi Khadem(Yonsei University)"
] |
In this paper, the effect of functionally graded material (FGM) coatings on the fracture behavior of semi-elliptical cracks in cylinders is assessed. The objective is to calculate the stress intensity factor (SIF) of a longitudinal semi-elliptical crack on the wall of an aluminum cylinder with FGM coating. A threedimensional finite element method (FEM) is used for constructing the mechanical models and analyzing the SIFs of cracks. The effect of many geometrical parameters such as relative depth, crack aspect ratio, FG coating thickness to liner thickness as well as the mechanical properties of the FG coating on the SIF of the cracks is discussed. For a special case, the validity of the FE model is examined. The results indicated that there is a particular crack aspect ratio in which the maximum value of SIFs changes from the deepest point to the surface point of the crack. Moreover, it was found that the SIFs decrease by increasing the thickness ratio of the cylinder. But, the cylinder length has no effect on the crack SIFs.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002029705
|
oai_dc
|
Behaviour of continuous prestressed concrete beams with external tendons
|
Behaviour of continuous prestressed concrete beams with external tendons
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K.H. Enoch Chan(CH2M HILL); Vahid Babaghasabha(The University of Hong Kong)"
] |
External prestressing has been applied to both new construction and retrofitting of existing reinforced and prestressed concrete structures. Continuous beams are preferred to simply supported beams because of economy, fewer movement joints and possible benefits from moment redistribution. However, this paper argues that continuous prestressed concrete beams with external unbonded tendons demonstrate different full-range behaviour compared to reinforced concrete (RC) beams. Applying the same design approach for RC to external prestressing may lead to design with a lower safety margin. To better understand the behaviour of continuous prestressed concrete beams with unbonded tendons, an experimental investigation is performed in which nine such specimens are tested to failure. The full-range behaviour is investigated with reference to moment-curvature relationship and moment redistribution. The amounts of moment redistribution measured in the experiments are compared with those allowed by BS 8110, EC2 and ACI 318. Design equations are also proposed to estimate the curvature ductility index of unbonded prestressed concrete beams.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002029711
|
oai_dc
|
Optimizing structural topology patterns using regularization of Heaviside function
|
Optimizing structural topology patterns using regularization of Heaviside function
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이동규(세종대학교); 신수미(부산대학교)"
] |
This study presents optimizing structural topology patterns using regularization of Heaviside function. The present method needs not filtering process to typical SIMP method. Using the penalty formulation of the SIMP approach, a topology optimization problem is formulated in co-operation, i.e., couple-signals, with design variable values of discrete elements and a regularized Heaviside step function.
The regularization of discontinuous material distributions is a key scheme in order to improve the numerical problems of material topology optimization with 0 (void)-1 (solid) solutions. The weak forms of an equilibrium equation are expressed using a coupled regularized Heaviside function to evaluate sensitivity analysis. Numerical results show that the incorporation of the regularized Heaviside function and the SIMP leads to convergent solutions. This method is tested using several examples of a linear elastostatic structure.
It demonstrates that improved optimal solutions can be obtained without the additional use of sensitivity filtering to improve the discontinuous 0-1 solutions, which have generally been used in material topology optimization problems.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002029717
|
oai_dc
|
Dynamic properties of a building with viscous dampers in non-proportional arrangement
|
Dynamic properties of a building with viscous dampers in non-proportional arrangement
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Luis E. Suarez(University of Puerto Rico at Mayaguez); Carlos A. Gaviria(Universidad de la Costa)"
] |
Any rational approach to define the configuration and size of viscous fluid dampers in a structure should be based on the dynamic properties of the system with the dampers. In this paper we propose an alternative representation of the complex eigenvalues of multi degree of freedom systems with dampers to calculate new equivalent natural frequencies. Analytical expressions for the dynamic properties of a two-story building model with a linear viscous damper in the first floor (i.e. with a non-proportional damping matrix) are derived. The formulas permit to obtain the equivalent damping ratios and equivalent natural frequencies for all the modes as a function of the mass, stiffness and damping coefficient for underdamped and overdamped systems. It is shown that the commonly used formula to define the equivalent natural frequency is not applicable for this type of system and for others where the damping matrix is not proportional to the mass matrix, stiffness matrix or both. Moreover, the new expressions for the equivalent natural frequencies expose a novel phenomenon; the use of viscous fluid dampers can modify the vibration frequencies of the structure. The significance of the new equivalent natural frequencies is expounded by means of a simulated free vibration test. The proposed approach may offer a new perspective to study the effect of viscous dampers on the dynamic properties of a structure.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002029713
|
oai_dc
|
A novel proficient and sufficient intensity measure for probabilistic analysis of skewed highway bridges
|
A novel proficient and sufficient intensity measure for probabilistic analysis of skewed highway bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Bayat(Tarbiat Modares University); F. Daneshjoo(Tarbiat Modares University); N. Nistico(Università degli Studi di Roma La Sapienza)"
] |
In this paper, a new intensity measure of earthquakes for probabilistic seismic analysis is presented for skewed highway bridges. Three different cases of skewed bridges with different skew angles (0o, 30o and 45o) are considered. Well-known intensity measures (e.g., PGA, Sa) are evaluated and critically discussed based on sensitivity analysis: efficiency, practically, proficiency and sufficiency of intensity measures are considered in detail. The analyses demonstrated that the intensity measures have to take into account structural acceleration on a wide range of periods so that a new seismic intensity measure is proposed showing that it has less dispersion compared to others. Since the proposed intensity represents the average value of the Sa (between a lower and upper structural period) it has been called Averaged Spectral Acceleration (ASA). Based on performed incremental dynamic analysis (IDA), the seismic analytical fragility curves of typical skewed highway bridges have been evaluated for different states of damage controlling the low dispersion of the ASA index as well as its proficiency and sufficiency.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002029710
|
oai_dc
|
Experimental study on seismic behavior of reinforced concrete column retrofitted with prestressed steel strips
|
Experimental study on seismic behavior of reinforced concrete column retrofitted with prestressed steel strips
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bo Zhang(Xi’an University of Architecture & Technology); Yong Yang(Xi’an University of Architecture & Technology); Yuan-feng Wei(Xi’an University of Architecture & Technology); Ru-yue Liu(Xi’an University of Architecture & Technology); Chu Ding(Virginia Tech); Ke-qiang Zhang(Shaanxi University of Technology)"
] |
In this study, a new retrofitting method for improving the seismic performance of reinforced concrete column was presented, in which prestressed steel strips were utilized as retrofitting stuff to confine the reinforced concrete column transversely. In order to figure out the seismic performance of concrete column specimen retrofitted by such prestressed steel strips methods, a series of quasi-static tests of five retrofitted specimens and two unconfined column specimen which acted as control specimens were conducted. Based on the test results, the seismic performance including the failure modes, hysteresis performance, ductility performance, energy dissipation and stiffness degradation of all these specimens were fully investigated and analyzed. And furthermore the influences of some key parameters such as the axial force ratios, shear span ratios and steel strips spacing on seismic performance of those retrofitted reinforced concrete column specimens were also studied. It was shown that the prestressed steel strips provided large transverse confining effect on reinforced concrete column specimens, which resulted in improving the shearing bearing capacity, ductility performance, deformation capacity and energy dissipation performance of retrofitted specimens effectively. In comparison to the specimen which was retrofitted by the carbon fiber reinforced plastics (CFRP) strips method, the seismic performance of the specimens retrofitted by the prestressed steel strips was a bit better, and with much less cost both in material and labor. From this research results, it can be concluded that this new retrofitting method is really useful and has significant advantages both in saving money and time over some other retrofitting methods.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002029716
|
oai_dc
|
Structural damage detection based on Chaotic Artificial Bee Colony algorithm
|
Structural damage detection based on Chaotic Artificial Bee Colony algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H.J. Xu(Sun Yat-sen University); Z.H. Ding(Sun Yat-sen University); Z.R. Lu(Sun Yat-sen University); J.K. Liu(Sun Yat-sen University)"
] |
A method for structural damage identification based on Chaotic Artificial Bee Colony (CABC) algorithm is presented. ABC is a heuristic algorithm with simple structure, ease of implementation, good robustness but with slow convergence rate. To overcome the shortcoming, the tournament selection mechanism is chosen instead of the roulette mechanism and chaotic search mechanism is also introduced.
Residuals of natural frequencies and modal assurance criteria (MAC) are used to establish the objective function, ABC and CABC are utilized to solve the optimization problem. Two numerical examples are studied to investigate the efficiency and correctness of the proposed method. The simulation results show that the CABC algorithm can identify the local damage better compared with ABC and other evolutionary algorithms, even with noise corruption.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002029707
|
oai_dc
|
Use of design optimization techniques in solving typical structural engineering related design optimization problems
|
Use of design optimization techniques in solving typical structural engineering related design optimization problems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Filip Fedorik(University of Oulu); Jiří Kala(Brno University of Technology); Antti Haapala(University of Eastern Finland); Mikko Malaska(University of Oulu)"
] |
High powered computers and engineering computer systems allow designers to routinely simulate complex physical phenomena. The presented work deals with the analysis of two finite element method optimization techniques (First Order Method-FOM and Subproblem Approximation Method-SAM) implemented in the individual Design Optimization module in the Ansys software to analyze the behavior of real problems. A design optimization is a difficult mathematical process, intended to find the minimum or maximum of an objective function, which is mostly based on iterative procedure. Using optimization techniques in engineering designs requires detailed knowledge of the analyzed problem but also an ability to select the appropriate optimization method. The methods embedded in advanced computer software are based on different optimization techniques and their efficiency is significantly influenced by the specific character of a problem. The efficiency, robustness and accuracy of the methods are studied through strictly convex two-dimensional optimization problem, which is represented by volume minimization of two bars‟ plane frame structure subjected to maximal vertical displacement limit. Advantages and disadvantages of the methods are described and some practical tips provided which could be beneficial in any efficient engineering design by using an optimization method.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002072526
|
oai_dc
|
Effects of Hall current in a transversely isotropic magnetothermoelastic with and without energy dissipation due to normal force
|
Effects of Hall current in a transversely isotropic magnetothermoelastic with and without energy dissipation due to normal force
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rajneesh Kumar(Kurukshetra University); Nidhi Sharma(MM University); Parveen Lata(Punjabi University)"
] |
This investigation is concerned with the disturbances in a homogeneous transversely isotropic thermoelastic rotating medium with two temperature, in the presence of the combined effects of Hall currents and magnetic field due to normal force of ramp type. The formulation is applied to the thermoelasticity theories developed by Green-Naghdi Theories of Type-II and Type-III. Laplace and Fourier transform technique is applied to solve the problem. The analytical expressions of displacements, stress components, temperature change and current density components are obtained in the transformed domain. Numerical inversion technique has been applied to obtain the results in the physical domain. Numerically simulated results are depicted graphically to show the effects of Hall current and anisotropy on the resulting quantities. Some special cases are also deduced from the present investigation.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002072545
|
oai_dc
|
An investigation into the influence of thermal loading and surface effects on mechanical characteristics of nanotubes
|
An investigation into the influence of thermal loading and surface effects on mechanical characteristics of nanotubes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Farzad Ebrahimi(Imam Khomeini International University); Gholam Reza Shaghaghi(Imam Khomeini International University); Mahya Boreiry(Imam Khomeini International University)"
] |
In this paper the differential transformation method (DTM) is utilized for vibration and buckling analysis of nanotubes in thermal environment while considering the coupled surface and nonlocal effects. The Eringen’s nonlocal elasticity theory takes into account the effect of small size while the Gurtin- Murdoch model is used to incorporate the surface effects (SE). The derived governing differential equations are solved by DTM which demonstrated to have high precision and computational efficiency in the vibration analysis of nanobeams. The detailed mathematical derivations are presented and numerical investigations are performed while the emphasis is placed on investigating the effect of thermal loading, small scale and surface effects, mode number, thickness ratio and boundary conditions on the normalized natural frequencies and critical buckling loads of the nanobeams in detail. The results show that the surface effects lead to an increase in natural frequency and critical buckling load of nanotubes. It is explicitly shown that the vibration and buckling of a nanotube is significantly influenced by these effects and the influence of thermal loadings and nonlocal effects are minimal.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002072543
|
oai_dc
|
Design of double dynamic vibration absorbers for reduction of two DOF vibration system
|
Design of double dynamic vibration absorbers for reduction of two DOF vibration system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lovely Son(Andalas University); Mulyadi Bur(Andalas University); Meifal Rusli(Andalas University); Adriyan(Andalas University)"
] |
This research is aimed to design and analyze the performance of double dynamic vibration absorber (DVA) using a pendulum and a spring-mass type absorber for reducing vibration of two-DOF vibration system. The conventional fixed-points method and genetics algorithm (GA) optimization procedure are utilized in designing the optimal parameter of DVA. The frequency and damping ratio are optimized to determine the optimal absorber parameters. The simulation results show that GA optimization procedure is more effective in designing the double DVA in comparison to the fixed-points method. The experimental study is conducted to verify the numerical result.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002072536
|
oai_dc
|
Static and dynamic behavior of FGM plate using a new first shear deformation plate theory
|
Static and dynamic behavior of FGM plate using a new first shear deformation plate theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lazreg Hadji(University of Sidi Bel Abbes); M. Ait Amar Meziane(University of Sidi Bel Abbes); Z. Abdelhak(University of Sidi Bel Abbes); T. Hassaine Daouadji(University of Sidi Bel Abbes); E.A Adda Bedia(University of Sidi Bel Abbes)"
] |
In this paper, a new first shear deformation plate theory based on neutral surface position is developed for the static and the free vibration analysis of functionally graded plates (FGPs). Moreover, the number of unknowns of this theory is the least one comparing with the traditional first-order and the other higher order shear deformation theories. The neutral surface position for a functionally graded plate which its material properties vary in the thickness direction is determined. The mechanical properties of the plate are assumed to vary continuously in the thickness direction by a simple power-law distribution in terms of the volume fractions of the constituents. Based on the present shear deformation plate theory and the neutral surface concept, the governing equations are derived from the principle of Hamilton. There is no stretchingbending coupling effect in the neutral surface based formulation. Numerical illustrations concern flexural and dynamic behavior of FG plates with Metal-Ceramic composition. Parametric studies are performed for varying ceramic volume fraction, length to thickness ratios. The accuracy of the present solutions is verified by comparing the obtained results with the existing solutions.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002072516
|
oai_dc
|
Numerical analysis on stability of express railway tunnel portal
|
Numerical analysis on stability of express railway tunnel portal
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xiaojun Zhou(Southwest Jiaotong University); Hongyun Hu(Southwest Jiaotong University); Bo Jiang(China Railway ErYuan Engineering Group Co. Ltd.); Yuefeng Zhou(China Railway ErYuan Engineering Group Co. Ltd.); Yong Zhu(China Railway ErYuan Engineering Group Co. Ltd.)"
] |
On the basis of the geological conditions of high and steep mountainous slope on which an exit portal of an express railway tunnel with a bridge-tunnel combination is to be built, the composite structure of the exit portal with a bridge abutment of the bridge-tunnel combination is presented and the stability of the slope on which the express railway portal is to be built is analyzed using three dimensional (3D) numerical simulation in the paper. Comparison of the practicability for the reinforcement of slope with in-situ bored piles and diaphragm walls are performed so as to enhance the stability of the high and steep slope. The safety factor of the slope due to rockmass excavation both inside the exit portal and beneath the bridge abutment of the bridge-tunnel combination has been also derived using strength reduction technique. The obtained results show that post tunnel portal is a preferred structure to fit high and steep slope, and the surrounding rock around the exit portal of the tunnel on the high and steep mountainous slope remains stable when rockmass is excavated both from the inside of the exit portal and underneath the bridge abutment after the slope is reinforced with both bored piles and diaphragm walls. The stability of the high and steep slope is principally dominated by the shear stress state of the rockmass at the toe of the slope; the procedure of excavating rockmass in the foundation pit of the bridge abutment does not obviously affect the slope stability. In-situ bored piles are more effective in controlling the deformation of the abutment foundation pit in comparison with diaphragm walls and are used as a preferred retaining structure to uphold the stability of slope in respect of the lesser time, easier procedure and lower cost in the construction of the exit portal with bridge-tunnel combination on the high and steep mountainous slope. The results obtained from the numerical analysis in the paper can be used to guide the structural design and construction of express railway tunnel portal with bridge-tunnel combination on high and abrupt mountainous slope under similar situations.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002072530
|
oai_dc
|
Vibration of axially moving 3-phase CNTFPC plate resting on orthotropic foundation
|
Vibration of axially moving 3-phase CNTFPC plate resting on orthotropic foundation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ali Ghorbanpour Arani(University of Kashan); Elham Haghparast(University of Kashan); Hassan Baba Akbar Zarei(University of Kashan)"
] |
In the present study, modelling and vibration control of axially moving laminated Carbon nanotubes/fiber/polymer composite (CNTFPC) plate under initial tension are investigated. Orthotropic visco-Pasternak foundation is developed to consider the influences of orthotropy angle, damping coefficient, normal and shear modulus. The governing equations of the laminated CNTFPC plates are derived based on new form of first-order shear deformation plate theory (FSDT) which is simpler than the conventional one due to reducing the number of unknowns and governing equations, and significantly, it does not require a shear correction factor. Halpin-Tsai model is utilized to evaluate the material properties of two-phase composite consist of uniformly distributed and randomly oriented CNTs through the epoxy resin matrix.
Afterwards, the structural properties of CNT reinforced polymer matrix which is assumed as a new matrix and then reinforced with E-Glass fiber are calculated by fiber micromechanics approach. Employing Hamilton’s principle, the equations of motion are obtained and solved by Hybrid analytical numerical method. Results indicate that the critical speed of moving laminated CNTFPC plate can be improved by adding appropriate values of CNTs. These findings can be used in design and manufacturing of marine vessels and aircrafts.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002072519
|
oai_dc
|
Axial buckling response of fiber metal laminate circular cylindrical shells
|
Axial buckling response of fiber metal laminate circular cylindrical shells
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ali M. Moniri Bidgoli(University of Tehran); Mohammad Heidari-Rarani(University of Isfahan)"
] |
Fiber metal laminates (FMLs) represent a high-performance family of hybrid materials which consist of thin metal sheets bonded together with alternating unidirectional fiber layers .In this study, the buckling behavior of a FML circular cylindrical shell under axial compression is investigated via both analytical and finite element approaches. The governing equations are derived based on the first-order shear deformation theory and solved by the Navier solution method. Also, the buckling load of a FML cylindrical shell is calculated using linear eigenvalue analysis in commercial finite element software, ABAQUS. Due to lack of experimental and analytical data for buckling behavior of FML cylindrical shells in the literature, the proposed model is simplified to the full-composite and full-metal cylindrical shells and buckling loads are compared with the available results. Afterwards, the effects of FML parameters such as metal volume fraction (MVF), composite fiber orientation, stacking sequence of layers and geometric parameters are studied on the buckling loads. Results show that the FML layup has the significant effect on the buckling loads of FML cylindrical shells in comparison to the full-composite and full-metal shells. Results of this paper hopefully provide a useful guideline for engineers to design an efficient and economical structure.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002072540
|
oai_dc
|
A hybrid method for dynamic stiffness identification of bearing joint of high speed spindles
|
A hybrid method for dynamic stiffness identification of bearing joint of high speed spindles
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yongsheng Zhao(Beijing University of Technology); Bingbing Zhang(Beijing University of Technology); Guoping An(Beijing University of Technology); Zhifeng Liu(Beijing University of Technology); Ligang Cai(Beijing University of Technology)"
] |
Bearing joint dynamic parameter identification is crucial in modeling the high speed spindles for machining centers used to predict the stability and natural frequencies of high speed spindles. In this paper, a hybrid method is proposed to identify the dynamic stiffness of bearing joint for the high speed spindles. The hybrid method refers to the analytical approach and experimental method. The support stiffness of spindle shaft can be obtained by adopting receptance coupling substructure analysis method, which consists of series connected bearing and joint stiffness. The bearing stiffness is calculated based on the Hertz contact theory. According to the proposed series stiffness equation, the stiffness of bearing joint can be separated from the composite stiffness. Then, one can obtain the bearing joint stiffness fitting formulas and its variation law under different preload. An experimental set-up with variable preload spindle is developed and the experiment is provided for the validation of presented bearing joint stiffness identification method.
The results show that the bearing joint significantly cuts down the support stiffness of the spindles, which can seriously affects the dynamic characteristic of the high speed spindles.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002072523
|
oai_dc
|
XFEM for fatigue and fracture analysis of cracked stiffened panels
|
XFEM for fatigue and fracture analysis of cracked stiffened panels
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.R. Nanda Kumar(Bhabha Atomic Research Centre); A. Ramachandra Murthy(CSIR-Structural Engineering Research Centre); Smitha Gopinath(CSIR-Structural Engineering Research Centre); Nagesh R. Iyer(CSIR-Structural Engineering Research Centre)"
] |
This paper presents the development of methodologies using Extended Finite Element Method (XFEM) for cracked unstiffened and concentric stiffened panels subjected to constant amplitude tensile fatigue loading. XFEM formulations such as level set representation of crack, element stiffness matrix formulation and numerical integration are presented and implemented in MATLAB software. Stiffeners of the stiffened panels are modelled using truss elements such that nodes of the panel and nodes of the stiffener coincide. Stress Intensity Factor (SIF) is computed from the solutions of XFEM using domain form of interaction integral. Paris’s crack growth law is used to compute the number of fatigue cycles up to failure. Numerical investigations are carried out to model the crack growth, estimate the remaining life and generate damage tolerant curves. From the studies, it is observed that (i) there is a considerable increase in fatigue life of stiffened panels compared to unstiffened panels and (ii) as the external applied stress is decreasing number of fatigue life cycles taken by the component is increasing.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002072517
|
oai_dc
|
Identification of flexible vehicle parameters on bridge using particle filter method
|
Identification of flexible vehicle parameters on bridge using particle filter method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Talukdar(Indian Institute of Technology); R. Lalthlamuana(Indian Institute of Technology)"
] |
A conditional probability based approach known as Particle Filter Method (PFM) is a powerful tool for system parameter identification. In this paper, PFM has been applied to identify the vehicle parameters based on response statistics of the bridge. The flexibility of vehicle model has been considered in the formulation of bridge-vehicle interaction dynamics. The random unevenness of bridge has been idealized as non homogeneous random process in space. The simulated response has been contaminated with artificial noise to reflect the field condition. The performance of the identification system has been examined for various measurement location, vehicle velocity, bridge surface roughness factor, noise level and assumption of prior probability density. Identified vehicle parameters are found reasonably accurate and reconstructed interactive force time history with identified parameters closely matches with the simulated results. The study also reveals that crude assumption of prior probability density function does not end up with an incorrect estimate of parameters except requiring longer time for the iterative process to converge.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001900092
|
oai_dc
|
Multi-criteria shape design of crane-hook taking account of estimated load condition
|
Multi-criteria shape design of crane-hook taking account of estimated load condition
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Takao Muromaki(Maizuru National College of Technology); Kazuyuki Hanahara(Kobe University); Yukio Tada(Kobe University)"
] |
In order to improve the crane-hook‟s performance and service life, we formulate a multi-criteriashape design problem considering practical conditions. The structural weight, the displacement at specifiedpoints and the induced matrix norm of stiffness matrix are adopted as the evaluation items to be minimized.
The heights and widths of cross-section are chosen as the design variables. The design variables areexpressed in terms of shape functions based on the Gaussian function. For this multi-objective optimizationproblem with three items, we utilize a multi-objective evolutionary algorithm, that is, the multi-objectiveParticle Swarm Optimization (MOPSO). As a common feature of obtained solutions, the side views aretapered shapes similar to those of actual crane-hook designs. The evaluation item values of the obtaineddesigns demonstrate importance of the present optimization as well as the feasibility of the proposed optimaldesign approach.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001900096
|
oai_dc
|
Tailoring the second mode of Euler-Bernoulli beams: an analytical approach
|
Tailoring the second mode of Euler-Bernoulli beams: an analytical approach
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Korak Sarkar(Indian Institute of Science); Ranjan Ganguli(Indian Institute of Science)"
] |
In this paper, we study the inverse mode shape problem for an Euler-Bernoulli beam, using ananalytical approach. The mass and stiffness variations are determined for a beam, having various boundary conditions, which has a prescribed polynomial second mode shape with an internal node. It is found that physically feasible rectangular cross-section beams which satisfy the inverse problem exist for a variety of boundary conditions. The effect of the location of the internal node on the mass and stiffness variations and on the deflection of the beam is studied. The derived functions are used to verify the p-version finite element code, for the cantilever boundary condition. The paper also presents the bounds on the location of the internal node, for a valid mass and stiffness variation, for any given boundary condition. The derived property variations, corresponding to a given mode shape and boundary condition, also provides a simple closed-form solution for a class of non-uniform Euler-Bernoulli beams. These closed-form solutions canalso be used to check optimization algorithms proposed for modal tailoring.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001900098
|
oai_dc
|
Modeling nonlinear behavior of gusset plates in the truss based steel bridges
|
Modeling nonlinear behavior of gusset plates in the truss based steel bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Babur Deliktas(Uludag University); Akhaan Mizamkhan(Uludag University)"
] |
The truss based steel bridge structures usually consists of gusset plates which lose their load carrying capacity and rigidity under the effect of repeated and dynamics loads. This paper is focused on modeling the nonlinear material behavior of the gusset plates of the Truss Based Bridges subjected to dynamics loads. The nonlinear behavior of material is characterized by a damage coupled elsto-plastic material models. A truss bridge finite element model is established in Abaqus with the details of the gusset plates and their connections. The nonlinear finite element analyses are performed to calculate stress and strain states in the gusset plates under different loading conditions. The study indicates that damage initiationoccurred in the plastic deformation localized region of the gusset plates where all, diagonal, horizontal and vertical, truss member met and are critical for shear type of failure due tension and compression interaction. These findings are agreed with the analytical and experimental results obtained for the stress distribution of this kind gusset plate.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001900101
|
oai_dc
|
Flexure of cross-ply laminated plates using equivalent single layer trigonometric shear deformation theory
|
Flexure of cross-ply laminated plates using equivalent single layer trigonometric shear deformation theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Atteshamuddin S. Sayyad(University of Pune); Yuwaraj M. Ghugal(Government Engineering College)"
] |
An equivalent single layer trigonometric shear deformation theory taking into account transverse shear deformation effect as well as transverse normal strain effect is presented for static flexure of cross-ply laminated composite and sandwich plates. The inplane displacement field uses sinusoidal function in terms of thickness coordinate to include the transverse shear deformation effect. The cosine function in thickness coordinate is used in transverse displacement to include the effect of transverse normal strain. The kinematics of the present theory is much richer than those of the other higher order shear deformation theories, because if the trigonometric term (involving thickness coordinate z) is expanded in power series, the kinematics of higher order theories (which are usually obtained by power series in thickness coordinate z) are implicitly taken into account to good deal of extent. Governing equations and boundary conditions of the theory are obtained using the principle of virtual work. The closed-form solutions of simply supported cross-ply laminated composite and sandwich plates have been obtained. The results of present theory are compared with those of the classical plate theory (CPT), first order shear deformation theory (FSDT), higher order shear deformation theory (HSDT) of Reddy and exact three dimensional elasticity theory wherever applicable. The results predicted by present theory are in good agreement with those of higher order shear deformation theory and the elasticity theory.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001900093
|
oai_dc
|
A novel two-dimensional approach to modelling functionally graded beams resting on a soil medium
|
A novel two-dimensional approach to modelling functionally graded beams resting on a soil medium
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Amin Chegenizadeh(Curtin University); Behzad Ghadimi(Curtin University); Hamid Nikraz(Curtin University); Mesut Simsek(Yildiz Technical University)"
] |
The functionally graded beam (FGB) is investigated in this study on both dynamic and static loading in case of resting on a soil medium rather than on the usual Winkler-Pasternak elastic foundation. The powerful ABAQUS software was used to model the problem applying finite element method. In the present study, two different soil models are taken into account. In the first model, the soil is assumed to be an elastic plane stress medium. In the second soil model, the Drucker-Prager yield criterion, which is one of the most well-known elastic-perfectly plastic constitutive models, is used for modelling the soil medium. The results are shown to evaluate the effects of the different soil models, stiffness values of the elastic soil medium on the normal and shear stress and free vibration properties. A comparison was made to those from the existing literature. Numerical results show that considering real soil as a continuum space affects the results of the bending and the modal properties significantly.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001900094
|
oai_dc
|
Control of chaotic dynamics by magnetorheological damping of a pendulum vibration absorber
|
Control of chaotic dynamics by magnetorheological damping of a pendulum vibration absorber
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Krzysztof Kecik(Lublin University of Technology)"
] |
Investigations of regular and chaotic vibrations of the autoparametric pendulum absorber suspended on a nonlinear coil spring and a magnetorheological damper are presented in the paper. Application of a semi-active damper allows controlling the dangerous motion without stooping of system and additionally gives new possibilities for designers. The investigations are curried out close to the main parametric resonance. Obtained numerical and experimental results show that the semi-active suspension may reduce dangerous motion and it also allows to maintain the pendulum at a given attractor or to jump to another one. Moreover, the results show that, for some parameters, MR damping may transit to chaotic motions.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001900095
|
oai_dc
|
Structural impact response characteristics of an explosion- resistant profiled blast walls in arctic conditions
|
Structural impact response characteristics of an explosion- resistant profiled blast walls in arctic conditions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"손정민(부산대학교); 김상진(부산대학교); 성동진(부산대학교); 김봉주(부산대학교); 하연철(부산대학교); 서정관(부산대학교); 백점기(부산대학교)"
] |
Environmental changes, especially global climate change, are creating new challenges to the development of the Arctic regions, which have substantial energy resources. And attention to offshore structures has increased with oil and gas development. The structural impact response of an explosionresistantprofiled blast walls normally changes when it operates in low temperatures. The main objectives of this study are to investigate the structural response of blast walls in low temperature and suggest useful guidelines for understanding the characteristics of the structural impact response of blast walls subjected to hydrocarbon explosions in Arctic conditions. The target temperatures were based on the average summer temperature (−20°C), the average winter temperature (−40°C) and the coldest temperature recorded (approximately −68°C) in the Arctic. The nonlinear finite element analysis was performed to design an explosion-resistant profiled blast wall for use in Arctic conditions based on the behaviour of material properties at low temperatures established by performing a tensile test. The conclusions and implications of the findings are discussed.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001900097
|
oai_dc
|
Topological material distribution evaluation for steel plate reinforcement by using CCARAT optimizer
|
Topological material distribution evaluation for steel plate reinforcement by using CCARAT optimizer
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이동규(세종대학교); 신수미(부산대학교); 박현정(신라대학교); 박성수(부산대학교)"
] |
The goal of this study is to evaluate and design steel plates with optimal material distributions achieved through a specific material topology optimization by using a CCARAT (Computer Aided Research Analysis Tool) as an optimizer, topologically optimally updating node densities as design variables. In typical material topology optimization, optimal topology and layouts are described by distributing element densities (from almost 0 to 1), which are arithmetic means of node densities. The average element densitiesare employed as material properties of each element in finite element analysis. CCARAT may deal with material topology optimization to address the mean compliance problem of structural mechanical problems. This consists of three computational steps: finite element analysis, sensitivity analysis, and optimality criteria optimizer updating node densities. The present node density based design via CCARAT using node densities as design variables removes jagged optimal layouts and checkerboard patterns, which are disadvantages of classical material topology optimization using element densities as design variables. Numerical applications that topologically optimize reinforcement material distribution of steel plates of a cantilever type are studied to verify the numerical superiority of the present node density based design via CCARAT.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001900099
|
oai_dc
|
Blastability Quality System (BQS) for using it, in bedrock excavation
|
Blastability Quality System (BQS) for using it, in bedrock excavation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"B. Christaras(Aristotle University of Thessaloniki); M. Chatziangelou(Aristotle University of Thessaloniki)"
] |
Success in the excavation of foundations is commonly known as being very important in asserting stability. Furthermore, when the subjected formation is rocky and the use of explores is required, the demands of successful blasting are multiplied. The quick and correct estimation of excavation’s characteristics may help the design of building structures, increasing their safety. The present paper proposes a new classification system which connects blastability and rock mass quality. This new system primarily concerns poor and friable rock mass, heavily broken with mixture of angular and rounded rock pieces. However, it should concern medium and good quality rock mass. The Blastability Quality System (BQS) can be an easy and widely - used tool as it is a quick calculator for blastability index (BI) and rock mass quality. Taking into account the research calculations and the parameters of BQS, what has been at question in this paper is the effect of BI magnitude on a geological structure.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001900100
|
oai_dc
|
Design analysis of the optimum configuration of self-anchored cable-stayed suspension bridges
|
Design analysis of the optimum configuration of self-anchored cable-stayed suspension bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Paolo Lonetti(University of Calabria); Arturo Pascuzzo(University of Calabria)"
] |
This paper describes a formulation to predict optimum post-tensioning forces and cable dimensioning for self-anchored cable-stayed suspension bridges. The analysis is developed with respect toboth dead and live load configurations, taking into account design constrains concerning serviceability and ultimate limit states. In particular, under dead loads, the analysis is developed with the purpose to calculate the post-tensioning cable forces to achieve minimum deflections for both girder and pylons. Moreover, under live loads, for each cable elements, the lowest required cross-section area is determined, which verifies prescriptions, under ultimate or serviceability limit states, on maximum allowable stresses and bridge deflections. The final configuration is obtained by means of an iterative procedure, which leads to aprogressive definition of the stay, hanger and main cable characteristics, concerning both post-tensioningcable stresses and cross-sections. The design procedure is developed in the framework of a FE modeling, by using a refined formulation of the bridge components, taking into account of geometric nonlinearities involved in the bridge components. The results demonstrate that the proposed method can be easily utilized to predict the cable dimensioning also in the framework of long span bridge structures, in which typically more complexities are expected in view of the large number of variables involved in the design analysis.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002089428
|
oai_dc
|
Effect of stiffener arrangement on hysteretic behavior of link-to-column connections
|
Effect of stiffener arrangement on hysteretic behavior of link-to-column connections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Seyed Mehdi Zahrai(The University of Tehran); Saman Zarsav(Islamic Azad University); Asghar Vatani Oskouei(Shahid Rajaee Teacher Training University)"
] |
Link-to-column connections in Eccentrically Braced Frames (EBFs) have critical role in their safety and seismic performance. Accordingly, in this study, contribution of supplemental stiffeners on hysteretic behavior of the link-to-column connection is investigated. Considered stiffeners are placed on both sides and parallel to the link web between the column face and the first stiffener of the link. Hysteretic behaviors of the link beams with supplemental stiffeners are numerically investigated using a pre-validated numerical model in ANSYS. It turned out that supplemental stiffeners can change energy dissipation mechanism of intermediate links from shear-flexure to shear. Both rectangular and trapezoidal supplemental stiffeners are studied. Moreover, optimal placement of the supplemental stiffeners is also investigated. Obtained results indicate a discrepancy of less than 9% in maximum link shear of the numerical and experimental specimens. This indicates that the numerical results are in good agreement with those obtained from the test. Trapezoidal supplemental stiffeners improve rotational capacity of the link. Moreover, use of two supplemental stiffeners at both ends of the link can more effectively improve hysteretic behavior of intermediate links. Supplemental stiffeners would also alleviate the imposed demands on the connections. This latter feature is more pronounced in the case of two supplemental stiffeners at both ends of the link.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002089431
|
oai_dc
|
Buckling of plates including effect of shear deformations: a hyperelastic formulation
|
Buckling of plates including effect of shear deformations: a hyperelastic formulation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Idris A. Musa(University of Duhok)"
] |
Consistent finite strain Plate constitutive relations are derived based on a hyperelastic formulation for an isotropic material. Plate equilibrium equations under finite strain are derived following a static kinematic approach. Three Euler angles and four shear angles, based on Timoshenko beam theory, represent the kinematics of the deformations in the plate cross section. The Green deformation tensor has been expressed in term of a deformation tensor associated with the deformation and stretches of an embedded plate element. Buckling formulation includes the in-plane axial deformation prior to buckling and transverse as well as in-plane shear deformations. Numerical results for a simply supported thick plate under uni-axial compression force are presented.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002089427
|
oai_dc
|
A novel approximate solution for nonlinear problems of vibratory systems
|
A novel approximate solution for nonlinear problems of vibratory systems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mahmoud Bayat(Islamic Azad University); Seyyed A. Edalati(Tarbiat Modares University); Iman Pakar(Islamic Azad University); Mahdi Bayat(Islamic Azad University)"
] |
In this research, an approximate analytical solution has been presented for nonlinear problems of vibratory systems in mechanical engineering. The new method is called Variational Approach (VA) which is applied in two different high nonlinear cases. It has been shown that the presented approach leads us to an accurate approximate analytical solution. The results of variational approach are compared with numerical solutions. The full procedure of the numerical solution is also presented. The results are shown that the variatioanl approach can be an efficient and practical mathematical tool in field of nonlinear vibration.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002089426
|
oai_dc
|
An advanced criterion based on non-AFR for anisotropic sheet metals
|
An advanced criterion based on non-AFR for anisotropic sheet metals
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Farzad Moayyedian(Eqbal Lahoori Institute of Higher Education); Mehran Kadkhodayan2a(Ferdowsi University of Mashhad)"
] |
In the current research an advanced criterion with non-associated flow rule (non-AFR) for depicting the behavior of anisotropic sheet metals is presented to consider the strength differential effects (SDEs) for these materials. Owing to the fact that Lou et al. (2013) yield function is dependent on structure of an anisotropic material (BCC, FCC and HCP), an advanced yield function with inspiring of Yoon et al. (2014) yield function is proposed which is dependent upon anisotropic structures. Furthermore, to compute Lankford coefficients, a new pressure sensitive plastic potential function which would be dependent to anisotropic structure is presented and coupled with the proposed yield function with employing a non-AFR in a novel criterion which is called here ‘advanced criterion’. Totally eighteen experimental data are required to calibrate the criterion contained of directional tensile and compressive yield stresses for the yield function and directional Lankford coefficients for the plastic potential function. To verify the criterion, three anisotropic sheet metals with different structures are taken as case studies such as Al 2008-T4 (a BCC material), Al 2090-T3 (a FCC material) and AZ31 (a HCP material).
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002089425
|
oai_dc
|
Exact vibration of Timoshenko beam combined with multiple mass spring sub-systems
|
Exact vibration of Timoshenko beam combined with multiple mass spring sub-systems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tamer A. El-Sayed(Helwan University); Said H. Farghaly(Helwan University)"
] |
This paper deals with the analysis of the natural frequencies, mode shapes of an axially loaded beam system carrying ends consisting of non-concentrated tip masses and three spring-two mass subsystems. The influence of system design and sub-system parameters on the combined system characteristics is the major part of this investigation. The effect of material properties, rotary inertia and shear deformation of the beam system is included. The end masses are elastically supported against rotation and translation at an offset point from the point of attachment. Sub-systems are attached to center of gravity eccentric points out of the beam span. The boundary conditions of the ordinary differential equation governing the lateral deflections and slope due to bending of the beam system including developed shear force frequency dependent terms, due to the sub–system suspension, have been formulated. Exact formulae for the modal frequencies and the modal shapes have been derived. Based on these formulae, detailed parametric studies are carried out. The geometrical and mechanical parameters of the system under study have been presented in non-dimensional analysis. The applied mathematical model is presented to cover wide range of mechanical, naval and structural engineering applications.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002089429
|
oai_dc
|
The stability of semi-rigid skeletal structures accounting for shear deformations
|
The stability of semi-rigid skeletal structures accounting for shear deformations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Halil Gorgun(Dicle University)"
] |
The analysis and design of skeletal structures is greatly influenced by the behaviour of beamto- column connections, where patented designs have led to a wide range of types with differing structural quantities. The behaviour of beam-to-column connections plays an important role in the analysis and design of framed structures. This paper presents an overview of the influence of connection behaviour on structural stability, in the in-plane (bending) mode of sway. A computer-based method is presented for geometrically nonlinear plane frames with semi-rigid connections accounting for shear deformations. The analytical procedure employs transcendental modified stability functions to model the effect of axial force on the stiffness of members. The member stiffness matrix were found. The critical load has been searched as a suitable load parameter for the loss of stability of the system. Several examples are presented to demonstrate the validity of the analysis procedure. The method is readily implemented on a computer using matrix structural analysis techniques and is applicable for the efficient nonlinear analysis of frameworks. Combined with a parametric column effective length study, connection and frame stiffness are used to propose a method for the analysis of semi-rigid frames where column effective lengths are greatly reduced and second order (deflection induced) bending moments in the column may be distributed via the connectors to the beams, leading to significant economies.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002089430
|
oai_dc
|
Flat-bottomed design philosophy of Y-typed bifurcations in hydropower stations
|
Flat-bottomed design philosophy of Y-typed bifurcations in hydropower stations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chang-zheng Shi(Wuhan University); Yang Wang(Wuhan University); He-gao Wu(Wuhan University); Qi-ling Zhang(Changjiang River Scientific Research Institute); Kai Su(Wuhan University)"
] |
The drainage problem in bifurcations causes pecuniary losses when hydropower stations are undergoing periodic overhaul. A new design philosophy for Y-typed bifurcations that are flat-bottomed is proposed. The bottoms of all pipe sections are located at the same level, making drainage due to gravity possible and shortening the draining time. All fundamental curves were determined, and contrastive analysis with a crescent-rib reinforced bifurcation in an actual project was conducted. Feasibility demonstrations were researched including structural characteristics based on finite element modeling and hydraulic characteristics based on computational fluid dynamics. The new bifurcation provided a well-balanced shape and reasonable stress state. It did not worsen the flow characteristics, and the head loss was considered acceptable. The proposed Y-typed bifurcation was shown to be suitable for pumped storage power stations
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002089433
|
oai_dc
|
The investigation crack problem through numerical analysis
|
The investigation crack problem through numerical analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Murat Yaylacı(Recep Tayyip Erdoğan University)"
] |
This paper presents a comparative study of finite element method (FEM) and analytical method for the plane problem of a layered composite containing an internal perpendicular crack in literature. The layered composite consists of two elastic layers having different elastic constants and heights. External load is applied to the upper elastic layer by means o a rigid punch and the lower elastic layer rests on two simple supports. Numerical simulations are realized by the world wide code ANYS software. Two dimensional analysis of the problem is carried out and the results are verified by comparison with solutions reported in literature. Main goal of the numerical simulation is to investigate the normal stress <i>σ<sub>x</sub></i>(0, <i>y</i>), stress intensity factors at the crack factor and the crack opening displacements
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002089432
|
oai_dc
|
Efficiency assessment of L-profiles and pipe fore-poling pre- support systems in difficult geological conditions: a case study
|
Efficiency assessment of L-profiles and pipe fore-poling pre- support systems in difficult geological conditions: a case study
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ayub Elyasi(Tarbiat Modares University); Taher Moradi(Consultant Engineering Institute of Iman Sazan); Javad Moharrami(Consultant Engineering Institute of Iman Sazan); Saeid Parnian(Consultant Engineering Institute of Iman Sazan); Akbar Mousazadeh(Islamic Azad University of Naghadeh); Sepideh Nasseh(Ferdowsi University of Mashhad)"
] |
Tunneling is one of the challenging tasks in civil engineering because it involves a variety of decision making and engineering judgment based on knowledge and experience. One of the challenges is to construct tunnels in risky areas under shallow overburden. In order to prevent the collapse of ceilings and walls of a large tunnels, in such conditions, either a sequential excavation method (SEM) or ground reinforcing method, or a combination of both, can be utilized. This research deals with the numerical modeling of L-profiles and pipe fore-poling pre-support systems in the adit tunnel in northwestern Iran. The first part of the adit tunnel has been drilled in alluvial material with very weak geotechnical parameters. Despite applying an SEM in constructing this tunnel, analyzing the results of numerical modeling done using FLAC3D, as well as observations during drilling, indicate the tunnel instability. To improve operational safety and to prevent collapse, pre-support systems, including pipe fore-poling and L-profiles were designed and implemented. The results of the numerical modeling coupled with monitoring during operation, as well as the results of instrumentation, indicate the efficacy of both these methods in tunnel collapse prevention. Moreover, the results of modeling using FLAC3D and SECTION BUILDER suggest a double angle with equal legs (2L100×100×10 mm) in both box profile and tee array as an alternative section to pipe fore-poling system while neither L80×80×8 mm nor 2L80×80×8 mm can sustain the axial and shear stresses exerted on pipe fore-poling system.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART002089424
|
oai_dc
|
Comparative dynamic analysis of axially loaded beams on modified Vlasov foundation
|
Comparative dynamic analysis of axially loaded beams on modified Vlasov foundation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Çağlayan Hızal(Izmir Institute of Technology); Hikmet Hüseyin Çatal(Dokuz Eylul University)"
] |
Vibration analysis of the beams on elastic foundation has gained the great interest of many researchers. In the literature, there are many studies that focus on the free vibration analysis of the beams on one or two parameter elastic foundations. On the other hand, there are no sufficient studies especially focus on the comparison of dynamic response including the bending moment and shear force of the beams resting on Winkler and two parameter foundations. In this study, dynamic response of the axially loaded Timoshenko beams resting on modified Vlasov type elastic soil was investigated by using the separation of variables method. Governing equations were obtained by assuming that the material had linear elastic behaviour and mass of the beam was distributed along its length. Numerical analysis were provided and presented in figures to find out the differences between the modified Vlasov model and conventional Winkler type foundation. Furthermore, the effect of shear deformation of elastic soil on the dynamic response of the beam was investigated.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001910217
|
oai_dc
|
Improving buckling response of the square steel tube by using steel foam
|
Improving buckling response of the square steel tube by using steel foam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammadreza Moradi(Old Dominion University); Sanjay R. Arwade(University of Massachusetts)"
] |
Steel tubes have an efficient shape with large second moment of inertia relative to their lightweight. One of the main problems of these members is their low buckling resistance caused from havingthin walls. In this study, steel foams with high strength over weight ratio is used to fill the steel tube tobeneficially modify the response of steel tubes. The linear eigenvalue and plastic collapse FE analysis isdone on steel foam filled tube under pure compression and three point bending simulation. It is shown thatsteel foam improves the maximum strength and the ability of energy absorption of the steel tubessignificantly. Different configurations with different volume of steel foam and composite behavior isinvestigated. It is demonstrated that there are some optimum configurations with more efficient behavior. Ifcomposite action between steel foam and steel increases, the strength of the element will improve, in a waythat, the failure mode change from local buckling to yielding.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001910210
|
oai_dc
|
Displacements and stresses in pressurized thick FGM cylinders with exponentially varying properties based on FSDT
|
Displacements and stresses in pressurized thick FGM cylinders with exponentially varying properties based on FSDT
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mehdi Ghannad(Shahrood University of Technology); Hamed Gharooni(Shahrood University of Technology)"
] |
Using the infinitesimal theory of elasticity and analytical formulation based on the first-order shear deformation theory (FSDT) is presented for axisymmetric thick-walled cylinders made of functionally graded materials under internal and/or external uniform pressure. The material is assumed to be isotropic heterogeneous with constant Poisson’s ratio and radially exponentially varying elastic modulus. At first, general governing equations of the FGM thick cylinders are derived by assumptions of the FSDT. Then the obtained equations are solved under the generalized clamped-clamped conditions. The results are compared with the findings of both FSDT and finite element method (FEM).
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001910206
|
oai_dc
|
Meshless local collocation method for natural frequencies and mode shapes of laminated composite shells
|
Meshless local collocation method for natural frequencies and mode shapes of laminated composite shells
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Song Xiang(Shenyang Aerospace University); Ying-tao Chen(Shenyang Aerospace University)"
] |
Meshless local collocation method produces much better conditioned matrices than meshless global collocation methods. In this paper, the meshless local collocation method based on thin plate spline radial basis function and first-order shear deformation theory are used to calculate the natural frequencies and mode shapes of laminated composite shells. Through numerical experiments, the accuracy and efficiency of present method are demonstrated.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001910219
|
oai_dc
|
New damage localization indicator based on curvature for single-span beams
|
New damage localization indicator based on curvature for single-span beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yi-lin Wang(Shandong Jianzhu University)"
] |
Most existing damage detection methods based on curvature should investigate the indicator value changes between the intact and damaged state. However, the ‘footprint’ in the intact state is usually not available for most actual beams. Therefore, a new damage localization indicator called Difference of Nearby Difference Curvature Indicator (DNDCI) was introduced for single-span beams. This indicator does not require prior information of the intact beam and is sensitive to the damage occurs on or nearby the measuring points. Practical and detailed application method of DNDCI has been proposed. Besides the idealized simply supported beams, it was validated by example that DNDCI is also applicable to the actual single-span beams supported by bearings.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001910213
|
oai_dc
|
Factor-analysis based questionnaire categorization method for reliability improvement of evaluation of working conditions in construction enterprises
|
Factor-analysis based questionnaire categorization method for reliability improvement of evaluation of working conditions in construction enterprises
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jeng-Wen Lin(Feng Chia University); Pu Fun Shen(Feng Chia University)"
] |
This paper presents a factor-analysis based questionnaire categorization method to improve the reliability of the evaluation of working conditions without influencing the completeness of the questionnaire both in Taiwanese and Chinese construction enterprises for structural engineering applications. The proposed approach springs from the AI application and expert systems in structural engineering. Questions with a similar response pattern are grouped into or categorized as one factor. Questions that form a single factor usually have higher reliability than the entire questionnaire, especially in the case when the questionnaire is complex and inconsistent. By classifying questions based on the meanings of the words used in them and the responded scores, reliability could be increased. The principle for classification was that 90% of the questions in the same classified group must satisfy the proposed classification rule and consequently the lowest one was 92%. The results show that the question classification method could improve the reliability of the questionnaires for at least 0.7. Compared to the question deletion method using SPSS, 75% of the questions left were verified the same as the results obtained by applying the classification method.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001910220
|
oai_dc
|
Structural damping of composite materials using combined FE and lamb wave method
|
Structural damping of composite materials using combined FE and lamb wave method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"B.S. Ben(National Institute of Technology); B.A. Ben(Andhra University); S.H. Kweon(경북대학교); S.H. Yang(경북대학교)"
] |
The article presents the methodology for finding material damping capacity at higher frequency and at relatively lower amplitudes. The Lamb wave dispersion theory and loss less finite element model is used to find the damping capacity of composite materials. The research has been focused on high frequency applications materials. The method was implemented on carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP) plates. The Lamb waves were generated using ultrasonic pulse generator setup. The hybrid method has been explored in this article and the results have been compared with bandwidth methods available in the literature.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001910208
|
oai_dc
|
Rational finite element method for plane orthotropic elastic problems
|
Rational finite element method for plane orthotropic elastic problems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ling Mao(Dalian University of Technology); Weian Yao(Dalian University of Technology); Qiang Gao(Dalian University of Technology); Wanxie Zhong(Dalian University of Technology)"
] |
The rational finite element method is different from the standard finite element method, which is constructed using basic solutions of the governing differential equations as interpolation functions in the elements. Therefore, it is superior to the isoparametric approach because of its obvious physical meaning and accuracy; it has successfully been applied to the isotropic elasticity problem. In this paper, the formulation of rational finite elements for plane orthotropic elasticity problems is deduced. This method is formulated directly in the physical domain with full consideration of the requirements of the patch test. Based on the number of element nodes and the interpolation functions, different approaches are applied with complete polynomial interpolation functions. Then, two special stiffness matrixes of elements with four and five nodes are deduced as a representative application. In addition, some typical numerical examples are considered to evaluate the performance of the elements. The numerical results demonstrate that the present method has a high level of accuracy and is an effective technique for solving plane orthotropic elasticity problems.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001910216
|
oai_dc
|
Numerical study on fluid flow by hydrodynamic loads in reactor internals
|
Numerical study on fluid flow by hydrodynamic loads in reactor internals
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김다혜(경희대학교); 장윤석(경희대학교); 정명조(한국원자력안전기술원)"
] |
Roles of reactor internals are to support nuclear fuel, provide insertion and withdrawal channelsof nuclear fuel control rods, and carry out core cooling. In case of functional loss of the reactor internals, itmay lead to severe accidents caused by damage of nuclear fuel assembly and deterioration of reactor vesseldue to attack of fallen out parts. The present study is to examine fluid flows in reactor internals subjected tohydrodynamic loads. In this context, an integrated model was developed and applied to two kinds ofnumerical analyses; one is to analyze periodic loading effect caused by pump pulsation and the other is toanalyze random loading effect employing different turbulent models. Acoustic pressure distributions andflow velocity as well as pressure and temperature fields were calculated and compared to establishappropriate analysis techniques.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001910221
|
oai_dc
|
Three dimensional static and dynamic analysis of two dimensional functionally graded annular sector plates
|
Three dimensional static and dynamic analysis of two dimensional functionally graded annular sector plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kamran Asemi(Amirkabir University of Technology); Manouchehr Salehi(Amirkabir University of Technology); Mojtaba Sadighi(Amirkabir University of Technology)"
] |
In this paper, three dimensional static and dynamic analyses of two dimensional functionally graded annular sector plates have been investigated. The material properties vary through both the radial and axial directions continuously. Graded finite element and Newmark direct integration methods have been used to solve the 3D-elasticity equations in time and space domains. The effects of power law exponents and different boundary conditions on the behavior of FGM annular sector plate have been investigated. Results show that using 2D-FGMs and graded elements have superiority over the homogenous elements and 1D-FGMs. The model has been compared with the result of a 1D-FGM annular sector plate and it shows good agreement.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001910211
|
oai_dc
|
Large post-buckling behavior of Timoshenko beams under axial compression loads
|
Large post-buckling behavior of Timoshenko beams under axial compression loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Şeref D. Akbaş(Bursa Technical University)"
] |
Large post-buckling behavior of Timoshenko beams subjected to non-follower axial compression loads are studied in this paper by using the total Lagrangian Timoshenko beam element approximation. Two types of support conditions for the beams are considered. In the case of beams subjected to compression loads, load rise causes compressible forces end therefore buckling and postbuckling phenomena occurs. It is known that post-buckling problems are geometrically nonlinear problems. The considered highly non-linear problem is solved considering full geometric non-linearity by using incremental displacement-based finite element method in conjunction with Newton-Raphson iteration method. There is no restriction on the magnitudes of deflections and rotations in contradistinction to von-Karman strain displacement relations of the beam. The beams considered in numerical examples are made of lower-Carbon Steel. In the study, the relationships between deflections, rotational angles, critical buckling loads, post-buckling configuration, Cauchy stress of the beams and load rising are illustrated in detail in post-buckling case.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001910207
|
oai_dc
|
Seismic design strategy of cable stayed bridges subjected to strong ground motions
|
Seismic design strategy of cable stayed bridges subjected to strong ground motions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yan Xu(Tongji University); Xinzhi Duan(Shanghai Municipal Engineering Design and Research Institute); Jianzhong Li(Tongji University)"
] |
In this paper, we present an alternative seismic design strategy for cable stayed bridges with concrete pylons when subjected to strong ground motions. The comparison of conventional seismic design using supplemental dampers (strategy A) and the new strategy using nonlinear seismic design of pylon columns (strategy B) is exemplified by one typical medium span cable stayed bridge subjected to strong ground motions from 1999 Taiwan Chi-Chi earthquake and 2008 China Wenchuan earthquake. We first conducted the optimization of damper parameters according to strategy A in response to the distinct features that strong ground motions contain. And then we adopted strategy B to carry out seismic analysis by introducing the elastic-plastic elements that allowing plasticity development in the pylon columns. The numerical results show that via strategy A, the earthquake induced structural responses can be kept in the desired range provided with the proper damping parameters, however, the extra cost of unusual dampers will be inevitable. For strategy B, the pylon columns may not remain elastic and certain plasticity developed, but the seismic responses of the foundation will be greatly decreased, meanwhile, the displacement at the top of pylon seems to be not affected much by the yielding of pylon columns, which indicates the pylon nonlinear design can be an alternative design strategy when strong ground motions have to be considered for the bridge.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001910214
|
oai_dc
|
Minimization of differential column shortening and sequential analysis of RC 3D-frames using ANN
|
Minimization of differential column shortening and sequential analysis of RC 3D-frames using ANN
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wilfried W. Njomo(Middle East Technical University); Giray Ozay(Eastern Mediterranean University)"
] |
In the preliminary design stage of an RC 3D-frame, repeated sequential analyses to determineoptimal members’ sizes and the investigation of the parameters required to minimize the differential columnshortening are computational effort consuming, especially when considering various types of loads such asdead load, temperature action, time dependent effects, construction and live loads. Because the desiredaccuracy at this stage does not justify such luxury, two backpropagation feedforward artificial neuralnetworks have been proposed in order to approximate this information. Instead of using a commercialsoftware package, many references providing advanced principles have been considered to code a programand generate these neural networks. The first one predicts the typical amount of time between two phases,needed to achieve the minimum maximorum differential column shortening. The other network aims toprognosticate sequential analysis results from those of the simultaneous analysis. After the training stages,testing procedures have been carried out in order to ensure the generalization ability of these respectivesystems. Numerical cases are studied in order to find out how good these ANN match with the sequentialfinite element analysis. Comparison reveals an acceptable fit, enabling these systems to be safely used in thepreliminary design stage.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001935685
|
oai_dc
|
Earthquake performance of FRP retrofitting of short columns around band-type windows
|
Earthquake performance of FRP retrofitting of short columns around band-type windows
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ali Koçak(Yıldız Technical University)"
] |
Due to design codes and regulations and the variety of building plans in Turkey, it is very often seen that band-type windows are left for ventilation and lightening of the basements of buildings which are used for various purposes such as workplaces and storage. Therefore when the necessary support measurescannot be given, short columns are subjected to very high shear forces and so damage occurs. One of the precautions to avoid the damage of short column mechanisms in buildings where band-type windows are in the basement is to strengthen the short columns with fiber reinforced polymer (FRP).
In this study, the effect of the FRP retrofitting process of the short columns around band-windowed structures, which are found especially in basement areas, is analyzed in accordance with Turkish Seismic Code 2007 (TSC 2007). Three different models which are bare frame, frame with short columns andretrofitted short columns with FRP, are created and analyzed according to TSC 2007 performance analysis methods to understand the effects of band windows in basements and the effect of FRP retrofitting.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001935692
|
oai_dc
|
A new look at the restrictions on the speed and magnitude of train loads for bridge management
|
A new look at the restrictions on the speed and magnitude of train loads for bridge management
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mehran Aflatooni(Queensland University of Technology); Tommy H.T. Chan(Queensland University of Technology); David P. Thambiratnam(Queensland University of Technology)"
] |
In current bridge management systems (BMSs), load and speed restrictions are applied onunhealthy bridges to keep the structure safe and serviceable for as long as possible. But the question is, whether applying these restrictions will always decrease the internal forces in critical components of thebridge and enhance the safety of the unhealthy bridges. To find the answer, this paper for the first time in literature, looks into the design aspects through studying the changes in demand by capacity ratios of the critical components of a bridge under the train loads. For this purpose, a structural model of a simply supported bridge, whose dynamic behaviour is similar to a group of real railway bridges, is developed. Demand by capacity ratios of the critical components of the bridge are calculated, to identify their sensitivity to increase of speed and magnitude of live load. The outcomes of this study are very significant as they show that, on the contrary to what is expected, by applying restriction on speed, the demand by capacity ratio of components may increase and make the bridge unsafe for carrying live load. Suggestions are made to solve the problem.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001935697
|
oai_dc
|
A method for predicting approximate lateral deflections in thin glass plates
|
A method for predicting approximate lateral deflections in thin glass plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H. Xenidis(Aristotle University of Thessaloniki); K. Morfidis(Institute of Engineering Seismology and Earthquake Engineering); P.G. Papadopoulos(Aristotle University of Thessaloniki)"
] |
In the present paper a three-dimensional non-linear truss element and a short computer program for the modeling and predicting approximate lateral deflections in thin glass plates by the method of incremental loading are proposed. Due to the out-of-plane large deflections of thin glass plates compared to the plate thickness within each loading increment, the equilibrium and stiffness conditions are written with respect to the deformed structure. An application is presented on a thin fully tempered monolithic rectangular glass plate, laterally supported around its perimeter subjected to uniform wind pressure. The results of the analysis are compared with published experimental results and found to have satisfactory approximation. It is also observed that the large deflections of a glass plate lead to a part substitution of the bending plate behavior by a tensioned membrane behavior which is favorable.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001935705
|
oai_dc
|
Investigation of wall flexibility effects on seismic behavior of cylindrical silos
|
Investigation of wall flexibility effects on seismic behavior of cylindrical silos
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ramazan Livaoğlu(Uludağ University); Ayşegül Durmuş(Karadeniz Technical University)"
] |
This paper is concerned with effects of the wall flexibility on the seismic behavior of groundsupported cylindrical silos. It is a well-known fact that almost all analytical approximations in the literatureto determine the dynamic pressure stemming from the bulk material assume silo structure as rigid. However, it is expected that the horizontal dynamic material pressures can be modified due to varying horizontal extensional stiffness of the bulk material which depends on the wall stiffness. In this study, finite element analyses were performed for six different slenderness ratios according to both rigid and flexible wall approximations. A three dimensional numerical model, taking into account bulk material-silo wall interaction, constituted by ANSYS commercial program was used. The findings obtained from the numerical analyses were discussed comparatively for rigid and flexible wall approximations in terms of the dynamic material pressure, equivalent base shear and bending moment. The numerical results clearly show that the wall flexibility may significantly affects the characteristics behavior of the reinforced concrete (RC) cylindrical silos and magnitudes of the responses under strong ground motions.
|
토목공학
| null |
kci_detailed_000068.xml
|
|||
ART001935686
|
oai_dc
|
Brazier effect of single- and double-walled elastic tubes under pure bending
|
Brazier effect of single- and double-walled elastic tubes under pure bending
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Motohiro Sato(Hokkaido University); Yuta Ishiwata(Hokkaido University)"
] |
The cross sections of hollow cylindrical tubes ovalise under a pure bending condition, and thisreduces their flexural stiffness as their curvatures increase. It is important to accurately evaluate this phenomenon, known as the „Brazier effect‟, to understand the bending behaviour of the systems considered. However, if the tubes are supported by an elastic medium or foundation, the ovalisation displacements of their cross sections may decrease. From this point of view, the purpose of this research is to analytically investigate the bending characteristics of single- and double-walled elastic tubes contacted by an elastic material by considering the Brazier effect. The Brazier moment, which is the maximum moment-carrying capacity of the ovalised cross section, can be calculated by introducing the strain energy per unit length of the tube in terms of the degree of ovalisation for the tube and the curvature. The total strain energy of the double-walled system is the sum of the strain energies of the outer and inner tubes and that of the compliant core. Results are comparatively presented to show the variation in the degree of ovalisation and the Brazier moment for single- and double-walled tubes.
|
토목공학
| null |
kci_detailed_000068.xml
|
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