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|---|---|---|---|---|---|---|---|---|---|---|---|---|
ART002114974
|
oai_dc
|
Effect of recycled glass powder on asphalt concrete modification
|
Effect of recycled glass powder on asphalt concrete modification
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Pourabbas Bilondi(Shahid Bahonar University of Kerman); S.M. Marandi(Shahid Bahonar University of Kerman); F. Ghasemi(Graduate University of Advanced Technology)"
] |
During recent years researchers performed large effort to increase the service life and asphalt stability of the roads against traffic loads and weather conditions. Investigations carried out in various aspects such as changes in gradation, addition of various additives, changes in asphalt textures and etc. The objective of this research is to evaluate the advantages of adding recycled glass powder (RGP), Crumb Rubber (CR), styrene-butadiene rubber (SBR) and styrene butadiene styrene (SBS) to base bitumen with grade of 60/70 for modification of asphalt concrete. Initial studies conducted for determining the physical properties of bitumen and modifiers. A series of asphalt concrete samples made using various combinations of RGP, CR, SBR, SBS and base bitumen. All samples tested using Indirect Tensile Strength (ITS), Indirect Tensile Strength Modulus (ITSM) and Marshall Stability Tests. The new data compared with the results of control samples. The results showed that replacing RGP with known polymers improved ITS and ITSM results considerably. Also the Marshall Stability of modified mixtures using RGP is more than what is found for the base blend. Ultimately, the new RGP modifier had a huge impact on pavement performance and results in high flexibility which can be concluded as high service life for the new modified asphalt concrete.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002114973
|
oai_dc
|
Thermo-mechanical vibration analysis of temperature- dependent porous FG beams based on Timoshenko beam theory
|
Thermo-mechanical vibration analysis of temperature- dependent porous FG beams based on Timoshenko beam theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Farzad Ebrahimi(Imam Khomeini International University); Ali Jafari(Imam Khomeini International University)"
] |
In this paper thermo-mechanical vibration analysis of a porous functionally graded (FG) Timoshenko beam in thermal environment with various boundary conditions are performed by employing a semi analytical differential transform method (DTM) and presenting a Navier type solution method for the first time. The temperature-dependent material properties of FG beam are supposed to vary through thickness direction of the constituents according to the power-law distribution which is modified to approximate the material properties with the porosity phases. Also the porous material properties vary through the thickness of the beam with even and uneven distribution. Two types of thermal loadings, namely, uniform and linear temperature rises through thickness direction are considered. Derivation of equations is based on the Timoshenko beam theory in order to consider the effect of both shear deformation and rotary inertia. Hamilton
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002114952
|
oai_dc
|
A new analytical approach for optimization design of adhesively bonded single-lap joint
|
A new analytical approach for optimization design of adhesively bonded single-lap joint
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Elhannani(University of Sidi Bel- Abbes); K. Madani(University of Sidi Bel- Abbes); M. Mokhtari(University of Sidi Bel- Abbes); S. Touzain(La Rochelle University); X. Feaugas(La Rochelle University); S. Cohendoz(La Rochelle University)"
] |
In this study the three-dimensional nonlinear finite element method was used to analyze the stresses distribution in the adhesive layer used to joint two Aluminum 2024-T3 adherends. We consider in this study the effect of different parameters witch directly affect the values of different stresses. The experimental design method is used to investigate the effects of geometrical parameters of the single lap joint in order to achieve an optimization of the assembly with simple lap joint. As a result, it can be said that both the geometrical modifications of the adhesive and adherends edge have presented a significant effect at the overlap edge thereby causing a decrease in peel and shear stresses. In addition, an analytical model is also given to predict in a simple but effective way the joint strength and its dependence on the geometrical parameters. This approach can help the designers to improve the quality and the durability of the structural adhesive joints.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002114939
|
oai_dc
|
Axisymmetric bending of a circular plate with stiff edge on a soft FGM layer
|
Axisymmetric bending of a circular plate with stiff edge on a soft FGM layer
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sergey S. Volkov(Don State Technical University,); Alexander N. Litvinenko(Southern Federal University); Sergey M. Aizikovich(Don State Technical University); Yun-Che Wang(National Cheng Kung University); Andrey S. Vasiliev(Don State Technical University)"
] |
A circular plate with constant thickness, finite radius and stiff edge lying on an elastic halfspace is considered. The half-space consists of a soft functionally graded (FGM) layer with arbitrary varying elastic properties and a homogeneous elastic substrate. The plate bends under the action of arbitrary axisymmetric distributed load and response from the elastic half-space. A semi-analytical solution for the problem effective in whole range of geometric (relative layer thickness) and mechanical (elastic properties of coating and substrate, stiffness of the plate) properties is constructed using the bilateral asymptotic method (Aizikovich et al. 2009). Approximated analytical expressions for the contact stresses and deflections of the plate are provided. Numerical results showing the qualitative dependence of the solution from the initial parameters of the problem are obtained with high precision.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002142035
|
oai_dc
|
Strengthening of steel hollow pipe sections subjected to transverse loads using CFRP
|
Strengthening of steel hollow pipe sections subjected to transverse loads using CFRP
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kambiz Narmashiri(Islamic Azad University); Ghadir Mehramiz(Islamic Azad University)"
] |
Nowadays using Carbon Fiber Reinforced Polymer (CFRP) has been expanded in strengthening steel structures. Given that few studies have taken about strengthening of steel hollow pipe sections using CFRP, in present study, the effects of CFRP sheets using two layers as well as in combination with additional reinforcing strips has been assessment. Strengthening of five specimens was carried out in laboratory tests. As well as numerical simulation was performed for all specimens by Finite Element Method (FEM) using ABAQUS software and high correlation between the results of numerical models with experimental data indicate the power of FEM in this field. The results of both laboratory and simulated specimens showed that load-bearing capacity of circular cross-sections can be significantly increased using CFRP retrofitting technique. Also, application of additional CFRP reinforcing strips and layers caused more strength for the strengthened specimens.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002142018
|
oai_dc
|
Higher order flutter analysis of doubly curved sandwich panels with variable thickness under aerothermoelastic loading
|
Higher order flutter analysis of doubly curved sandwich panels with variable thickness under aerothermoelastic loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mostafa livani(MalekAshtar University of Technology); Keramat MalekzadehFard(MalekAshtar University of Technology); Saeed Shokrollahi(MalekAshtar University of Technology)"
] |
In this study, the supersonic panel flutter of doubly curved composite sandwich panels with variable thickness is considered under aerothermoelastic loading. Considering different radii of curvatures of the face sheets in this paper, the thickness of the core is a function of plane coordinates (x,y), which is unique. For the first time in the current model, the continuity conditions of the transverse shear stress, transverse normal stress and transverse normal stress gradient at the layer interfaces, as well as the conditions of zero transverse shear stresses on the upper and lower surfaces of the sandwich panel are satisfied. The formulation is based on an enhanced higher order sandwich panel theory and the vertical displacement component of the face sheets is assumed as a quadratic one, while a cubic pattern is used for the in-plane displacement components of the face sheets and the all displacement components of the core.
The formulation is based on the von Kármán nonlinear approximation, the one-dimensional Fourier equation of the heat conduction along the thickness direction, and the first-order piston theory. The equations of motion and boundary conditions are derived using the Hamilton principle and the results are validated by the latest results published in the literature.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002142024
|
oai_dc
|
Ductile cracking simulation procedure for welded joints under monotonic tension
|
Ductile cracking simulation procedure for welded joints under monotonic tension
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Liang-Jiu Jia(Tongji University); Toyoki Ikai(Meijo University); Lan Kang(South China University of Technology); Hanbin Ge(Meijo University); Tomoya Kato(Meijo University)"
] |
A large number of welded steel moment-resisting framed (SMRF) structures failed due to brittle fracture induced by ductile fracture at beam-to-column connections during 1994 Northridge earthquake and 1995 Kobe (Hyogoken-Nanbu) earthquake. Extensive research efforts have been devoted to clarifying the mechanism of the observed failures and corresponding countermeasures to ensure more ductile design of welded SMRF structures, while limited research on the failure analysis of the ductile cracking was conducted due to lack of computational capacity and proper theoretical models. As the first step to solve this complicated problem, this paper aims to establish a straightforward procedure to simulate ductile cracking of welded joints under monotonic tension. There are two difficulties in achieving the aim of this study, including measurement of true stress-true strain data and ductile fracture parameters of different subzones in a welded joint, such as weld deposit, heat affected zone and the boundary between the two. Butt joints are employed in this study for their simple configuration. Both experimental and numerical studies on two types of butt joints are conducted. The validity of the proposed procedure is proved by comparison between the experimental and numerical results.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002142020
|
oai_dc
|
Procedures for determination of elastic curve of simply and multiple supported beams
|
Procedures for determination of elastic curve of simply and multiple supported beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"István Bíró(University of Szeged); Livija Cveticanin(University of Novi Sad)"
] |
In this paper two procedures for determination of the elastic curve of the simply and multiple supported beams are developed. Determination of the elastic curve is complex as it requires to solve a strong nonlinear differential equation with given boundary conditions. For numerical solution the initial guess of the slope at the end of the beam is necessary. Two procedures for obtaining of the initial guess are developed: one, based on transformation of the supported beam into a clamped-free one, and second, on the linearization of the problem. Procedures are applied for calculating of elastic curve of a simply supported beam and a beam with three supports. Obtained results are compared. Advantages and disadvantages of both methods are discussed. It is proved that both suggested procedures give us technically accurate results.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002142023
|
oai_dc
|
A new method for progressive collapse analysis of RC frames
|
A new method for progressive collapse analysis of RC frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Reza Abbasnia(Iran University of Science and Technology); Foad Mohajeri Nav(Iran University of Science and Technology); Nima Usefi(Iran University of Science and Technology); Omid Rashidian(Iran University of Science and Technology)"
] |
During the recent years, resistance mechanisms of reinforced concrete (RC) buildings against progressive collapse are investigated extensively. Although a general agreement is observed about their qualitative behavior in technical literature, there is not such a comprehensive point of view regarding the quantitative methods for predicting collapse resistance of RC members. Therefore, in the present study a simplified theoretical method is developed in order to predict general behavior of RC frames under the column removal scenario. In the introduced method, the robustness of the frame is extracted based on the capacity of the beams. The proposed method expresses ultimate arching and catenary capacities of the beams and also obtains the corresponding vertical displacements. Based on the calculated capacities, the introduced method also provides a quantitative assessment of structural robustness and determines whether or not the collapse occurs. The capability of the method is evaluated using experimental results in the literature. The evaluation study indicates that the proposed theoretical procedure can establish a reliable foundation for progressive collapse assessment of RC frame structures.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002142026
|
oai_dc
|
Deformation behaviours of SS304 tubes in pulsating hydroforming processes
|
Deformation behaviours of SS304 tubes in pulsating hydroforming processes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lianfa Yang(Guilin University of Electronic Technology); Ninghua Wang(Guilin University of Electronic Technology); Yulin He(Guilin University of Electronic Technology)"
] |
Tube hydroforming (THF) under pulsating hydraulic pressures is a novel technique that applies pulsating hydraulic pressures that are periodically increased to deform tubular materials. The deformation behaviours of tubes in pulsating THF may differ compared to those in conventional non-pulsating THF due to the pulsating hydraulic pressures. The equivalent stress-strain relationship of metal materials is an ideal way to describe the deformation behaviours of the materials in plastic deformation. In this paper, the equivalent stress-strain relationships of SS304 tubes in pulsating hydroforming are determined based on experiments and simulation of free hydraulic bulging (FHB), and compared with those of SS304 tubes in non-pulsating THF and uniaxial tensile tests (UTT). The effect of the pulsation parameters, including amplitude and frequency, on the equivalent stress-strain relationships is investigated to reveal the plastic deformation behaviours of tubes in pulsating hydroforming. The results show that the deformation behaviours of tubes in pulsating hydroforming can be well described by the equivalent stress-stain relationship obtained by the proposed method. The amplitude and frequency of pulsating hydraulic pressure have distinct effects on the equivalent stress-strain relationships-the equivalent stress becomes augmented and the formability is enhanced with the increase of the pulsation amplitude and frequency.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002142031
|
oai_dc
|
Efficiency of TLDs with bottom-mounted baffles in suppression of structural responses when subjected to harmonic excitations
|
Efficiency of TLDs with bottom-mounted baffles in suppression of structural responses when subjected to harmonic excitations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hossein Shad(Universiti Teknologi Malaysia); Azlan Adnan(Universiti Teknologi Malaysia); Hamid Pesaran Behbahani(Universiti Teknologi Malaysia); Mohammadreza Vafaei(Universiti Teknologi Malaysia)"
] |
Tuned Liquid Dampers (TLDs) provide low damping when it comes to deep water condition, and that not all water depth is mobilized in energy dissipation. This research focussed on a method to improve the efficiency of TLDs with deep water condition. Several bottom-mounted baffles were installed inside a TLD and the dynamic characteristics of modified TLDs together with their effect on the vibration control of a SDOF structure were studied experimentally. A series of free vibration and harmonic forced vibration tests were carried out. The controlling parameter in the conducted tests was the Vertical Blocking Ratio (VBR) of baffles. Results indicated that increase in VBR decreases the natural frequency of TLD and increases its damping ratio. It was found that the VBR range of 10% to 30% reduced response of the structure significantly. The modified TLD with the VBR of 30% showed the best performance when reduction in structural responses under harmonic excitations were compared.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002142033
|
oai_dc
|
Improved formulation for a structure-dependent integration method
|
Improved formulation for a structure-dependent integration method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shuenn-Yih Chang(National Taipei University of Technology); Tsui-Huang Wu(National Taipei University of Technology); Ngoc-Cuong Tran(National Taipei University of Technology)"
] |
Structure-dependent integration methods seem promising for structural dynamics applications since they can integrate unconditional stability and explicit formulation together, which can enable the integration methods to save many computational efforts when compared to an implicit method. A newly developed structure-dependent integration method can inherit such numerical properties. However, an unusual overshooting behavior might be experienced as it is used to compute a forced vibration response. The root cause of this inaccuracy is thoroughly explored herein. In addition, a scheme is proposed to modify this family method to overcome this unusual overshooting behavior. In fact, two improved formulations are proposed by adjusting the difference equations. As a result, it is verified that the two improved formulations of the integration methods can effectively overcome the difficulty arising from the inaccurate integration of the steady-state response of a high frequency mode.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002142027
|
oai_dc
|
Static and dynamic analysis of circular beams using explicit stiffness matrix
|
Static and dynamic analysis of circular beams using explicit stiffness matrix
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Rezaiee-Pajand(Ferdowsi University of Mashhad); Niloofar Rajabzadeh-Safaei(Ferdowsi University of Mashhad)"
] |
Two new elements with six degrees of freedom are proposed by applying the equilibrium conditions and strain-displacement equations. The first element is formulated for the infinite ratio of beam radius to thickness. In the second one, theory of the thick beam is used. Advantage of these elements is that by utilizing only one element, the exact solution will be obtained. Due to incorporating equilibrium conditions in the presented formulations, both proposed elements gave the precise internal forces. By solving some numerical tests, the high performance of the recommended formulations and also, interaction effects of the bending and axial forces will be demonstrated. While the second element has less error than the first one in thick regimes, the first element can be used for all regimes due to simplicity and good convergence. Based on static responses, it can be deduced that the first element is efficient for all the range of structural characteristics. The free vibration analysis will be performed using the first element. The results of static and dynamic tests show no deficiency, such as, shear and membrane locking and excessive stiff structural behavior.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002142025
|
oai_dc
|
A probabilistic analysis of Miner’s law for different loading conditions
|
A probabilistic analysis of Miner’s law for different loading conditions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sergio Blasón(University of Oviedo); José A.F.O. Correia(University of Porto); Abílio M.P. De Jesus(University of Porto); Rui A.B. Calçada(University of Porto); Alfonso Fernández-Canteli(University of Oviedo)"
] |
In this paper, the normalized variable V=(log N-B)(log Δσ-C), as derived from the probabilistic S-N field of Castillo and Canteli, is taken as a reference for calculation of damage accumulation and probability of failure using the Miner number in scenarios of variable amplitude loading. Alternative damage measures, such as the classical Miner and logarithmic Miner, are also considered for comparison between theoretical lifetime prediction and experimental data. The suitability of this approach is confirmed for it provides safe lifetime prediction when applied to fatigue data obtained for riveted joints made of a puddle iron original from the Fão bridge, as well as for data from experimental programs published elsewhere carried out for different materials (aluminium and concrete specimens) under distinct variable loading histories.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002126097
|
oai_dc
|
Analytical solutions for static bending of edge cracked micro beams
|
Analytical solutions for static bending of edge cracked micro beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Şeref Doğuşcan Akbaş(Bursa Technical University)"
] |
In this study, static bending of edge cracked micro beams is studied analytically under uniformly distributed transverse loading based on modified couple stress theory. The cracked beam is modelled using a proper modification of the classical cracked-beam theory consisting of two sub-beams connected through a massless elastic rotational spring. The deflection curve expressions of the edge cracked microbeam segments separated by the rotational spring are determined by the Integration method. The elastic curve functions of the edge cracked micro beams are obtained in explicit form for cantilever and simply supported beams. In order to establish the accuracy of the present formulation and results, the deflections are obtained, and compared with the published results available in the literature. Good agreement is observed. In the numerical study, the elastic deflections of the edge cracked micro beams are calculated and discussed for different crack positions, different lengths of the beam, different length scale parameter, different crack depths, and some typical boundary conditions. Also, the difference between the classical beam theory and modified couple stress theory is investigated for static bending of edge cracked microbeams. It is believed that the tabulated results will be a reference with which other researchers can compare their results.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002126094
|
oai_dc
|
Earthquake behavior of M1 minaret of historical Sultan Ahmed Mosque (Blue Mosque)
|
Earthquake behavior of M1 minaret of historical Sultan Ahmed Mosque (Blue Mosque)
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Turgut Kocatürk(Yildiz Technical University); Yildirim Serhat Erdoğan(Yildiz Technical University)"
] |
Minarets are almost the inevitable part of Mosques in Islam and according to some, from a philosophical point of view, today they symbolize the spiritual elevation of man towards God. Due to slenderness, minarets are susceptible to earthquakes and wind loads. They are mostly built in a masonry style by using cut limestone blocks or occasionally by using bricks. In this study, one minaret (M1 Minaret) of one of the charmest mosques of Turkey, Sultan Ahmed Mosque, popularly known as Blue Mosque, built between 1609 and 1616 on the order of Sultan Ahmed by the architect Mehmet Agha is investigated under some registered earthquake loads. According to historical records, a great earthquake hit Istanbul and/or its close proximity approximately every 250 years. Ottomans tackled with the problem of building earthquake resistant, slender minarets by starting to use forged iron connectors with lead as a filler to fix them to the upper and lower and to adjacent stones instead of using traditional mortar only. Thus, the discrete stones are able to transfer tensile forces in some sense. This study investigates the contribution of lead to the energy absorption capacity of the minaret under extensive earthquakes occurred in the region. By using the software ANSYS/LS-DYNA in modelling and investigating the minaret nonlinearly, it is found out that under very big recorded earthquakes, the connectors of vertical cast iron-lead mechanism play very important role and help to keep the structure safe.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002126070
|
oai_dc
|
Simplified procedure for seismic demands assessment of structures
|
Simplified procedure for seismic demands assessment of structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Benazouz Chikh(National Earthquake Engineering Research Center); Youcef Mehani(National Earthquake Engineering Research Center); Moussa Leblouba(University of Sharjah)"
] |
Methods for the seismic demands evaluation of structures require iterative procedures. Many studies dealt with the development of different inelastic spectra with the aim to simplify the evaluation of inelastic deformations and performance of structures. Recently, the concept of inelastic spectra has been adopted in the global scheme of the Performance-Based Seismic Design (PBSD) through Capacity- Spectrum Method (CSM). For instance, the Modal Pushover Analysis (MPA) has been proved to provide accurate results for inelastic buildings to a similar degree of accuracy than the Response Spectrum Analysis (RSA) in estimating peak response for elastic buildings. In this paper, a simplified nonlinear procedure for evaluation of the seismic demand of structures is proposed with its applicability to multi-degree-of-freedom (MDOF) systems. The basic concept is to write the equation of motion of (MDOF) system into series of normal modes based on an inelastic modal decomposition in terms of ductility factor. The accuracy of the proposed procedure is verified against the Nonlinear Time History Analysis (NL-THA) results and Uncoupled Modal Response History Analysis (UMRHA) of a 9-story steel building subjected to El-Centro 1940 (N/S) as a first application. The comparison shows that the new theoretical approach is capable to provide accurate peak response with those obtained when using the NL-THA analysis. After that, a simplified nonlinear spectral analysis is proposed and illustrated by examples in order to describe inelastic response spectra and to relate it to the capacity curve (Pushover curve) by a new parameter of control, called normalized yield strength coefficient (η). In the second application, the proposed procedure is verified against the NL-THA analysis results of two buildings for 80 selected real ground motions.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002126069
|
oai_dc
|
Nonlinear static and vibration analysis of Euler-Bernoulli composite beam model reinforced by FG-SWCNT with initial geometrical imperfection using FEM
|
Nonlinear static and vibration analysis of Euler-Bernoulli composite beam model reinforced by FG-SWCNT with initial geometrical imperfection using FEM
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Mohammadimehr(University of Kashan); S. Alimirzaei(University of Kashan)"
] |
In this paper, the nonlinear static and free vibration analysis of Euler-Bernoulli composite beam model reinforced by functionally graded single-walled carbon nanotubes (FG-SWCNTs) with initial geometrical imperfection under uniformly distributed load using finite element method (FEM) is investigated. The governing equations of equilibrium are derived by the Hamilton’s principle and von Karman type nonlinear strain-displacement relationships are employed. Also the influences of various loadings, amplitude of the waviness, UD, USFG, and SFG distributions of carbon nanotube (CNT) and different boundary conditions on the dimensionless transverse displacements and nonlinear frequency ratio are presented. It is seen that with increasing load, the displacement of USFG beam under force loads is more than for the other states. Moreover it can be seen that the nonlinear to linear natural frequency ratio decreases with increasing aspect ratio (h/L) for UD, USFG and SFG beam. Also, it is shown that at the specified value of (h/L), the natural frequency ratio increases with the increasing the values amplitude of waviness while the dimensionless nonlinear to linear maximum deflection decreases. Moreover, with considering the amplitude of waviness, the stiffness of Euler-Bernoulli beam model reinforced by FG-CNT increases. It is concluded that the R parameter increases with increasing of volume fraction while the rate of this parameter decreases. Thus one can be obtained the optimum value of FG-CNT volume fraction to prevent from resonance phenomenon.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002126083
|
oai_dc
|
Warping stresses of a rectangular single leaf flexure under torsion
|
Warping stresses of a rectangular single leaf flexure under torsion
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Nghia Huu Nguyen(Nha Trang University); Ji-Soo Kim(OSG Korea); Dong-Yeon Lee(Yeungnam University)"
] |
We describe a stress analysis of a single leaf flexure under torsion in which the warping effect is considered. The theoretical equations for the warping normal stress (xx) and shear stresses (xz and xy) are derived by applying the warping function of a rectangular cross-sectional beam and the twist angle equation that includes the warping torsion. The results are compared with those of the non-warping case and are verified using finite element analysis (FEA). A sensitivity analysis over the length, width, and thickness is performed and verified via FEA. The results show that the errors between the theory of warping stress results and the FEA results are lower than 4%. This indicates that the proposed theoretical stress analysis with warping is accurate in the torsion analysis of a single leaf flexure.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002126065
|
oai_dc
|
Seismic analysis of half-through steel truss arch bridge considering superstructure
|
Seismic analysis of half-through steel truss arch bridge considering superstructure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ruiqi Li(Tongji University); Xinzhe Yuan(Tongji University); Wancheng Yuan(Tongji University); Xinzhi Dang(Tongji University); Guoyu Shen(Tongji University)"
] |
This paper takes a half-through steel truss arch bridge as an example. A seismic analysis is conducted with nonlinear finite element method. Contrast models are established to discuss the effect of simplified method for main girder on the accuracy of the result. The influence of seismic wave direction and wave-passage on seismic behaviors are analysed as well as the superstructure and arch ring interaction which is mostly related with the supported bearings and wind resistant springs. In the end, the application of cable-sliding aseismic devices is discussed to put forward a layout principle. The main conclusions include: ① The seismic response isn’t too distinctive with the simplified method of main girder. Generally speaking, the grillage method is recommended. ② Under seismic input from different directions, arch foot is usually the mostly dangerous section. ③ Vertical wave input and horizontal wave-passage greatly influence the seismic responses of arch ring, significantly increasing that of midspan. ④ The superstructure interaction has an obvious impact on the seismic performance. Half-through arch bridges with long spandrel columns fixed has a less response than those with short ones fixed. And a large stiffness of wind resistant spring makes the the seismic responses of arch ring larger. ⑤ A good isolation effectiveness for half-through arch bridge can be achieved by a reasonable arrangement of CSFABs.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002126095
|
oai_dc
|
Analysis of a preliminary configuration for a floating wind turbine
|
Analysis of a preliminary configuration for a floating wind turbine
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H.F. Wang(Harbin Institute of Technology Shenzhen Graduate School); Y.H. Fan(Harbin Institute of Technology Shenzhen Graduate School); Iñigo Moreno(University of Burgos)"
] |
There are many theoretical analyses and experimental studies of the hydrodynamics for the tension leg platform (TLP) of a floating wind turbine. However, there has been little research on the arrangement of the TLP’s internal structure. In this study, a TLP model and a 5-MW wind turbine model as proposed by the Minstitute of Technology and the National Renewable Energy Laboratory have been adopted, respectively, to comprehensively analyze wind effects and wave and current combinations. The external additional coupling loads on the TLP and the effects of the loads on variables of the internal structure have been calculated. The study investigates preliminary layout parameters-namely, the thickness of the tension leg body, the contact mode of the top tower on the tension leg, the internal stiffening arrangement, and the formation of the spoke structure-and conducts sensitivity analyses of the TLP internal structure. Stress is found to be at a maximum at the top of the tension leg structure and the maximum stress has low sensitivity to the load application point. Different methods of reducing maximum stress have been researched and analyzed, and the effectiveness of these methods is analyzed. Filling of the spoke structure with concrete is discussed. Since the TLP structure for offshore wind power is still under early exploration, arrangements and the configuration of the internal structure, exploration and improvements are ongoing. With regard to its research and analysis process, this paper aims to guide future applications of tension leg structures for floating wind turbine.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002126067
|
oai_dc
|
Dynamics of the oscillating moving load acting on the hydro- elastic system consisting of the elastic plate, compressible viscous fluid and rigid wall
|
Dynamics of the oscillating moving load acting on the hydro- elastic system consisting of the elastic plate, compressible viscous fluid and rigid wall
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Surkay D. Akbarov(Yildiz Technical University); Meftun I. Ismailov(Nachicivan State University)"
] |
This paper studies the dynamics of the lineal-located time-harmonic moving-with-constantvelocity load which acts on the hydro-elastic system consisting of the elastic plate, compressible viscous fluid - strip and rigid wall. The plane-strain state in the plate is considered and its motion is described by employing the exact equations of elastodynamics but the plane-parallel flow of the fluid is described by the linearized Navier-Stokes equations. It is assumed that the velocity and force vectors of the constituents are continuous on the contact plane between the plate and fluid, and impermeability conditions on the rigid wall are satisfied. Numerical results on the velocity and stress distributions on the interface plane are presented and discussed and the focus is on the influence of the effect caused by the interaction between oscillation and moving of the external load. During these discussions, the corresponding earlier results by the authors are used which were obtained in the cases where, on the system under consideration, only the oscillating or moving load acts. In particular, it is established that the magnitude of the aforementioned interaction depends significantly on the vibration phase of the system.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002126081
|
oai_dc
|
Isogeometric method based in-plane and out-of-plane free vibration analysis for Timoshenko curved beams
|
Isogeometric method based in-plane and out-of-plane free vibration analysis for Timoshenko curved beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hongliang Liu(Dalian University of Technology); Xuefeng Zhu(Dalian University of Technology); Dixiong Yang(Dalian University of Technology)"
] |
In-plane and out-of-plane free vibration analysis of Timoshenko curved beams is addressed based on the isogeometric method, and an effective scheme to avoid numerical locking in both of the two patterns is proposed in this paper. The isogeometric computational model takes into account the effects of shear deformation, rotary inertia and axis extensibility of curved beams, and is applicable for uniform circular beams, and more complicated variable curvature and cross-section beams as illustrated by numerical examples. Meanwhile, it is shown that, the Cp–1-continuous NURBS elements remarkably have higher accuracy than the finite elements with the same number of degrees of freedom. Nevertheless, for in-plane or out-of-plane vibration analysis of Timoshenko curved beams, the NURBS-based isogeometric method also exhibits locking effect to some extent. To eliminate numerical locking, the selective reduced one-point integration and B projection element based on stiffness ratio is devised to achieve locking free analysis for in-plane and out-of-plane models, respectively. The suggested integral schemes for moderately slender models obtain accurate results in both dominated and non-dominated regions of locking effect. Moreover, this strategy is effective for beam structures with different slenderness. Finally, the influence factors of structural parameters of curved beams on their natural frequency are scrutinized.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART002126080
|
oai_dc
|
A unified formulation for static behavior of nonlocal curved beams
|
A unified formulation for static behavior of nonlocal curved beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ekrem Tufekci(Istanbul Technical University); Serhan A. Aya(Istanbul Technical University); Olcay Oldac(Istanbul Technical University)"
] |
Nanobeams are widely used as a structural element for nanodevices and nanomachines. The development of nano-sized machines depends on proper understanding of mechanical behavior of these nano-sized beam elements. Small length scales such as lattice spacing between atoms, surface properties, grain size etc. are need to be considered when applying any classical continuum model. In this study, Eringen’s nonlocal elasticity theory is incorporated into classical beam model considering the effects of axial extension and the shear deformation to capture unique static behavior of the nanobeams under continuum mechanics theory. The governing differential equations are obtained for curved beams and solved exactly by using the initial value method. Circular uniform beam with concentrated loads are considered. The displacements, slopes and the stress resultants are obtained analytically. A detailed parametric study is conducted to examine the effect of the nonlocal parameter, mechanical loadings, opening angle, boundary conditions, and slenderness ratio on the static behavior of the nanobeam.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001848952
|
oai_dc
|
Post-buckling finite strip analysis of thick functionally graded plates
|
Post-buckling finite strip analysis of thick functionally graded plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Hajikazemi(Amirkabir University of Technology); H.R. Ovesy(Amirkabir University of Technology); H. Assaee(Shiraz University of Technology); M.H. Sadr(Amirkabir University of Technology)"
] |
In this paper, a novel semi-energy finite strip method (FSM) is developed based on the concept of first order shear deformation theory (FSDT) in order to attempt the post-buckling solution for thin and relatively thick functionally graded (FG) plates under uniform end-shortening. In order to study the effects of through-the-thickness shear stresses on the post-buckling behavior of FG plates, two previously developed finite strip methods, i.e., semi-energy FSM based on the concept of classical laminated plate theory (CLPT) and a CLPT full-energy FSM, are also implemented. Moreover, the effects of aspect ratio on initial post-buckling stiffness of FG rectangular plates are studied. It has been shown that the variation of the ratio of initial post-buckling stiffness to pre-buckling stiffness (S*/S) with respect to aspects ratios is quite independent of volume fractions of constituents in thin FG plates. It has also been seen that the universal curve representing the variation of (S*/S) with aspect ratio of a FG plate demonstrate a saw shape curve. Moreover, it is revealed that for the thin FG plates in contrast to relatively thick plates, the variations of nondimensional load versus end-shortening is independent of ceramic-metal volume fraction index. This means that the post-buckling behavior of thin FG plates and the thin pure isotropic plates is similar. The results are discussed in detail and compared with those obtained from finite element method (FEM) of analysis. The study of the results may have a great influence in design of FG plates encountering post-buckling behavior.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001848955
|
oai_dc
|
Seismic assessment and retrofitting of existing structure based on nonlinear static analysis
|
Seismic assessment and retrofitting of existing structure based on nonlinear static analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Pengpeng Ni(IUSS Pavia)"
] |
Seismic assessment and retrofitting of existing structure is a complicated work that typicallyrequires more sophisticated analyses than performing a new design. Before the implementation of a Codefor seismic design of buildings (GBJ 11-89), not enough attention has been paid on seismic performance ofstructures and a great part of the existing reinforced concrete structures built in China have been poorlydesigned according to the new version of the same code (GB 50011-2010). This paper presents a case studyof seismic assessment of a non-seismically designed reinforced concrete building in China. The structuralresponses are evaluated using the nonlinear static procedure (the so-called pushover analysis), whichrequires its introduction within a process that allows the estimation of the demand, against which thecapacity is then compared with. The capacity of all structural members can be determined following thedesign code. Based on the structural performance, suitable retrofitting strategies are selected andimplemented to the existing system. The retrofitted structure is analyzed again to check the effectiveness ofthe rehabilitation. Different types of retrofitting strategy are discussed and classified according to theircomplexity and benefits. Finally, a proper intervention methodology is utilized to upgrade this typical lowrisenon-ductile building.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001848957
|
oai_dc
|
Exact solution for transverse bending analysis of embedded laminated Mindlin plate
|
Exact solution for transverse bending analysis of embedded laminated Mindlin plate
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Mehdi Heydari(Islamic Azad University); Reza Kolahchi(Islamic Azad University); Morteza Heydari(Islamic Azad University); Ali Abbasi(Islamic Azad University)"
] |
Laminated Rectangular plates embedded in elastic foundations are used in many mechanical structures. This study presents an analytical approach for transverse bending analysis of an embedded symmetric laminated rectangular plate using Mindlin plate theory. The surrounding elastic medium is simulated using Pasternak foundation. Adopting the Mindlin plate theory, the governing equations are derived based on strain-displacement relation, energy method and Hamilton’s principle. The exact analysis is performed for this case when all four ends are simply supported. The effects of the plate length, elastic medium and applied force on the plate transverse bending are shown. Results indicate that the maximum deflection of the laminated plate decreases when considering an elastic medium. In addition, the deflectionof the laminated plate increases with increasing the plate width and length.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001848954
|
oai_dc
|
Effects of stiffening rings on the dynamic properties of hyperboloidal cooling towers
|
Effects of stiffening rings on the dynamic properties of hyperboloidal cooling towers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jun-Feng Zhang(Zhengzhou University); Huai Chen(Zhengzhou University); Yao-Jun Ge(Tongji University); Lin Zhao(Tongji University); Shi-Tang Ke(Nanjing University of Aeronautics and Astronautics)"
] |
As hyperboloidal cooling towers (HCTs) growing larger and slender, they become more sensitive to gust wind. To improve the dynamic properties of HCTs and to improve the wind resistance capability, stiffening rings have been studied and applied. Although there have been some findings, the influence mechanism of stiffening rings on the dynamic properties is still not fully understood. Based on some fundamental perceptions on the dynamic properties of HCTs and free ring structures, a concept named “participation degree” of stiffening rings was proposed and the influence mechanism on the dynamic properties was illustrated. The “participation degree” is determined by the modal deform amplitude and latitude wave number of stiffening rings. Larger modal deform amplitude and more latitude waves can both result in higher participation degree and more improvement to eigenfrequencies. Also, this concept can explain and associate the pre-existing independent findings.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001848951
|
oai_dc
|
Experimental and numerical investigation of composite conical shells’ stability subjected to dynamic loading
|
Experimental and numerical investigation of composite conical shells’ stability subjected to dynamic loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sina Jalili(Khaje Nasir University of Technology); Jamal Zamani(Khaje Nasir University of Technology); M. Shariyat(Khaje Nasir University of Technology); N. Jalili(Amirkabir University of Technology); M.A.B. Ajdari(Khaje Nasir University of Technology); M. Jafari(Khaje Nasir University of Technology)"
] |
In this article, stability of composite conical shells subjected to dynamic external pressure is investigated by numerical and experimental methods. In experimental tests, cross-ply glass woven fabrics were selected for manufacturing of specimens. Hand-layup method was employed for fabricating the glassepoxy composite shells. A test-setup that includes pressure vessel and data acquisition system was designed. Also, numerical analyses are performed. In these analyses, effect of actual geometrical imperfections of experimental specimens on the numerical results is investigated. For introducing the imperfections to the numerical models, linear eigen-value buckling analyses were employed. The buckling modes are multiplied by very small numbers that are derived from measurement of actual specimens. Finally, results are compared together while a good agreement between results of imperfect numerical analyses and experimental tests is observed.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001848953
|
oai_dc
|
An investigation into the effects of voids, inclusions and minor cracks on major crack propagation by using XFEM
|
An investigation into the effects of voids, inclusions and minor cracks on major crack propagation by using XFEM
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shouyan Jiang(Hohai University); Chengbin Du(Hohai University); Chongshi Gu(Hohai University)"
] |
For the structures containing multiple discontinuities (voids, inclusions, and cracks), the simulation technologies in the framework of extended finite element method (XFEM) are discussed in details. The level set method is used for representing the location of inner discontinuous interfaces so that the mesh does not need to align with these discontinuities. Several illustrations have been given to verify that the implemented XFEM program is effective. Then, the implemented XFEM program is used to investigate the effects of the voids, inclusions, and minor cracks on the path of major crack propagation. For a plate containing cracks and voids, two possibly crack path can be observed: i) the crack propagates into the void; ii) the crack initially curves towards the void, then, the crack reorients itself and propagates along its original orientation. For a plate with a soft inclusion, the final predicted crack paths tend to close with the inclusion, and an evident difference of crack paths can be observed with different inclusion material properties. However, for a plate with a hard inclusion, the paths tend to away from the inclusion, and a slightly difference of crack paths can only be seen with different inclusion material properties. For a plate with several minor cracks, the trend of crack paths can still be described as that the crack initially curves towards these minor cracks, and then, the crack reorients itself and propagates almost horizontally along its original orientation.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001848956
|
oai_dc
|
SPIF-A: on the development of a new concept of incremental forming machine
|
SPIF-A: on the development of a new concept of incremental forming machine
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"R.J. Alves de Sousa(University of Aveiro); J.A.F. Ferreira(University of Aveiro); J.B. Sá de Farias(University of Aveiro); J.N.D. Torrão(University of Aveiro); D.G. Afonso(University of Aveiro); M.A.B.E Martins(University of Aveiro)"
] |
This paper presents the design and project of an innovative concept for a Single PointIncremental Forming (SPIF) Machine. Nowadays, equipment currently available for conducting SPIF resultmostly from the adaptation of conventional CNC machine tools that results in a limited range of applicationsin terms of materials and geometries. There is also a limited market supply of equipment dedicated toIncremental Sheet Forming (ISF), that are costly considering low batches, making it unattractive forindustry. Other factors impairing a quicker spread of SPIF are large forming times and poor geometricalaccuracy of parts. The following sections will depict the development of a new equipment, designed toovercome some of the limitations of machines currently used, allowing the development of a sounding basisfor further studies on the particular features of this process. The equipment here described possesses sixdegrees-of freedom for the tool, for the sake of improved flexibility in terms of achievable tool-paths and anextra stiffness provided by a parallel kinematics scheme. A brief state of the art about the existing SPIFmachines is provided to support the project’s guidelines.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001848950
|
oai_dc
|
Higher order free vibration of sandwich curved beams with a functionally graded core
|
Higher order free vibration of sandwich curved beams with a functionally graded core
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K. Malekzadeh Fard(Malek Ashtar University of Technology)"
] |
In this paper, free vibration of a sandwich curved beam with a functionally graded (FG) core was investigated. Closed-form formulations of two-dimensional (2D) refined higher order beam theory (RHOBT) without neglecting the amount of z/R was derived and used. The present RHOBT analysis incorporated a trapezoidal shape factor that arose due to the fact that stresses through the beam thickness were integrated over a curved surface. The solutions presented herein were compared with the available numerical and analytical solutions in the related literature and excellent agreement was obtained. Effects of some dimensionless parameters on the structural response were investigated to show their effects on fundamental natural frequency of the curved beam. In all the cases, variations of the material constant number were calculated and presented. Effect of changing ratio of core to beam thickness on the fundamental natural frequency depended on the amount of the material constant number.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001825762
|
oai_dc
|
Vibration of electrostatically actuated microbeam by means of homotopy perturbation method
|
Vibration of electrostatically actuated microbeam by means of homotopy perturbation method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Bayat(Islamic Azad University); I. Pakar(Islamic Azad University); A. Emadi(Tarbiat Modares University)"
] |
In this paper, it has been attempted to present a powerful analytical approach called Homotopy Perturbation Method (HPM). Free vibration of an electrostatically actuated microbeam is considered to study analytically. The effect of important parameters on the response of the system is considered. Some comparisons are presented to verify the results with other researcher’s results and numerical solutions. It has been indicated that HPM could be easily extend to any nonlinear equation. We try to provide an easy method to achieve high accurate solution which valid for whole domain.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001825760
|
oai_dc
|
Full-scale tests and analytical model of the Teflon-based lead rubber isolation bearings
|
Full-scale tests and analytical model of the Teflon-based lead rubber isolation bearings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lu Wang(Nanjing University of Technology); Jin Ou(Nanjing University of Technology); Weiqing Liu(Nanjing University of Technology); Shuguang Wang(Nanjing University of Technology)"
] |
Base isolation is widely used in seismic resisting buildings due to its low construction cost, high reliability, mature theory and convenient usage. However, it is difficult to design the isolation layer in highrise buildings using the available bearings because high-rise buildings are characterized with long period, low horizontal stiffness, and complex re-distribution of the internal forces under earthquake loads etc. In this paper, a simple and innovative isolation bearing, named Teflon-based lead rubber isolation bearing, is developed to address the mentioned problems. The Teflon-based lead rubber isolation bearing consists of friction material and lead rubber isolation bearing. Hence, it integrates advantages of friction bearings and lead rubber isolation bearings so that improves the stability of base isolation system. An experimental study was conducted to validate the effectiveness of this new bearing. The effects of vertical loading, displacement amplitude and loading frequency on the force-displacement relationship and energy dissipation capacity of the Teflon-based lead rubber isolation bearing were studied. An analytical model was also proposed to predict the force-displacement relationship of the new bearing. Comparison of analytical and experimental results showed that the analytical model can accurately predict the force-displacement relationship and elastic shear deflection of the Teflon-based lead rubber isolation bearings.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001825757
|
oai_dc
|
Preliminary design and structural responses of typical hybrid wind tower made of ultra high performance cementitious composites
|
Preliminary design and structural responses of typical hybrid wind tower made of ultra high performance cementitious composites
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xiangguo Wu(Harbin Institute of Technology); Jing Yang(Harbin Engineering University); Issa B. Mpalla(Harbin Institute of Technology)"
] |
Ultra High Performance Cementitious Composites with compressive strength 200MPa (UHPCC-200) is proposed for the structural design of super high hybrid wind turbine tower to gain durability, ductility and high strength design objectives. The minimal wall thickness is analyzed using basic bending and compression theory and is modified by a toque influence coefficient. Two cases of wall thickness combination of middle and bottom segment including varied ratio and constant ratio are considered within typical wall thickness dimension. Using nonlinear finite element analysis, the effects of wall thickness combinations with varied and constant ratio and prestress on the structural stress and lateral displacement are calculated and analyzed. The design limitation of the segmental wall thickness combinations is recommended.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001825764
|
oai_dc
|
Ductility and strength assessment of HSC beams with varying of tensile reinforcement ratios
|
Ductility and strength assessment of HSC beams with varying of tensile reinforcement ratios
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Mohammadhassani(University of Malaya); Meldi Suhatril(University of Malaya); Mahdi Shariati(University of Malaya); Farhad Ghanbari(University of Malaya)"
] |
Nine rectangular-section of High Strength Concrete(HSC) beams were designed and casted based on the American Concrete Institute (ACI) code provisons with varying of tensile reinforcement ratio as (ρmin, 0.2ρb, 0.3ρb, 0.4ρb, 0.5ρb, 0.75ρb, 0.85ρb, ρb, 1.2ρb). Steel and concrete strains and deflections were measured at different points of the beam’s length for every incremental load up to failure. The ductility ratios were calculated and the moment-curvature and load-deflection curves were drawn. The results showed that the ductility ratio reduced to less than 2 when the tensile reinforcement ratio increased to 0.5ρb. Comparison of the theoretical ductility coefficient from CSA94, NZS95 and ACI with the experimental ones shows that the three mentioned codes exhibit conservative values for low reinforced HSC beams. For over-reinforced HSC beams, only the CSA94 provision is more valid. ACI bending provision is 10 percent conservative for assessing of ultimate bending moment in low-reinforced HSC section while its results are valid for overreinforced HSC sections. The ACI code provision is non-conservative for the modulus of rupture and needs to be reviewed.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001825755
|
oai_dc
|
A novel 3D BE formulation for general multi-zone domains under body force loading
|
A novel 3D BE formulation for general multi-zone domains under body force loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Ghiasian(Tarbiat Modares University); Mohammad Taghi Ahmadi(Tarbiat Modares University)"
] |
The current paper proposes a boundary element formulation, applicable to 2-D and 3-D elastostatics problems using a unified approach for transformations of the domain integrals into boundary integrals. The method is applicable to linear problems encompassing both finite and infinite multi-region domains allowing non-vanishing body forces. Numerical results agree quite well with the analytical solutions; while the present method offers easy formulation with less numerical efforts in comparison to FEM or some BEM which need interior points to treat arbitrary body forces. It is demonstrated that the method has the potential to have profound impact on engineering design, notably in dam-foundation interaction.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001825753
|
oai_dc
|
A numerical tool for thermo-mechanical analysis of multilayer stepped structures
|
A numerical tool for thermo-mechanical analysis of multilayer stepped structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Paolo Emilio Bagnoli(University of Pisa); Maria Girardi(Institute of Information Science and Technologies “A. Faedo”); Cristina Padovani(Institute of Information Science and Technologies “A. Faedo”); Giuseppe Pasquinelli(Institute of Information Science and Technologies “A. Faedo”)"
] |
An integrated simulation tool for multilayer stepped pyramidal structures is presented. The tool, based on a semi-analytical mathematical strategy, is able to calculate the temperature distributions and thermal stresses at the interfaces between the layers of such structures. The core of the thermal solver is the analytical simulator for power electronic devices, DJOSER, which has been supplemented with a mechanical solver based on the finite-element method. To this end, a new ele-ment is proposed whose geometry is defined by its mean surface and thickness, just as in a plate. The resulting mechanical model is fully three-dimensional, in the sense that the deformability in the direction orthogonal to the mean surface is taken into account. The dedicated finite element code developed for solving the equilibrium problem of structures made up of two or more superimposed plates subjected to thermal loads is applied to some two-layer samples made of silicon and copper. Comparisons performed with the results of standard finite element analyses using a large number of brick elements reveal the soundness of the strategy employed and the accuracy of the tool developed.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001825766
|
oai_dc
|
Comprehensive evaluation of structural geometrical nonlinear solution techniques Part II: Comparing efficiencies of the methods
|
Comprehensive evaluation of structural geometrical nonlinear solution techniques Part II: Comparing efficiencies of the methods
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Rezaiee-Pajand(Ferdowsi University of Mashhad); M. Ghalishooyan(Ferdowsi University of Mashhad); M. Salehi-Ahmadabad(Ferdowsi University of Mashhad)"
] |
In part I of the article, formulation and characteristics of the several well-known structural geometrical nonlinear solution techniques were studied. In the present paper, the efficiencies and capabilities of residual load minimization, normal plane, updated normal plane, cylindrical arc length, work control, residual displacement minimization, generalized displacement control and modified normal flow will be evaluated. To achieve this goal, a comprehensive comparison of these solution methods will be performed. Due to limit page of the article, only the findings of 17 numerical problems, including 2-D and 3-D trusses, 2-D and 3-D frames, and shells, will be presented. Performance of the solution strategies will be considered by doing more than 12500 nonlinear analyses, and conclusions will be drawn based on the outcomes. Most of the mentioned structures have complex nonlinear behavior, including load limit and snap-back points. In this investigation, criteria like number of diverged and complete analyses, the ability of passing load limit and snap-back points, the total number of steps and analysis iterations, the analysis running time and divergence points will be examined. Numerical properties of each problem, like, maximum allowed iteration, divergence tolerance, maximum and minimum size of the load factor, load increment changes and the target point will be selected in such a way that comparison result to be highly reliable. Following this, capabilities and deficiencies of each solution technique will be surveyed in comparison with the other ones, and superior solution schemes will be introduced.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001825765
|
oai_dc
|
Comprehensive evaluation of structural geometrical nonlinear solution techniques Part I: Formulation and characteristics of the methods
|
Comprehensive evaluation of structural geometrical nonlinear solution techniques Part I: Formulation and characteristics of the methods
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Rezaiee-Pajand(Ferdowsi University of Mashhad); M. Ghalishooyan(Ferdowsi University of Mashhad); M. Salehi-Ahmadabad(Ferdowsi University of Mashhad)"
] |
This paper consists of two parts, which broadly examines solution techniques abilities for the structures with geometrical nonlinear behavior. In part I of the article, formulations of several well-known approaches will be presented. These solution strategies include different groups, such as: residual load minimization, normal plane, updated normal plane, cylindrical arc length, work control, residual displacement minimization, generalized displacement control, modified normal flow, and three-parameter ellipsoidal, hyperbolic, and polynomial schemes. For better understanding and easier application of the solution techniques, a consistent mathematical notation is employed in all formulations for correction and predictor steps. Moreover, other features of these approaches and their algorithms will be investigated. Common methods of determining the amount and sign of load factor increment in the predictor step and choosing the correct root in predictor and corrector step will be reviewed. The way that these features are determined is very important for tracing of the structural equilibrium path. In the second part of article, robustness and efficiency of the solution schemes will be comprehensively evaluated by performing numerical analyses.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001844356
|
oai_dc
|
Numerical study on the moment capacity of zed-section purlins under uplift loading
|
Numerical study on the moment capacity of zed-section purlins under uplift loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jue Zhu(Ningbo University); Jian-kang Chen(Ningbo University); Chong Ren(University of Birmingham)"
] |
In this paper a nonlinear finite element analysis model is established for cold-formed steel zed-section purlins subjected to uplift loading. In the model, the lateral and rotational restraints provided by the sheeting to the purlin are simplified as a lateral rigid restraint imposed at the upper flange-web junction and a rotational spring restraint applied at the mid of the upper flange where the sheeting is fixed. The analyses are performed by considering both geometrical and material nonlinearities. The influences of therotational spring stiffness and initial geometrical imperfections on the uplift loading capacity of the purlin are investigated numerically. It is found that the rotational spring stiffness has significant influence on the purlin performance. However, the influence of the initial geometric imperfections on the purlin performance is found only in purlins of medium or long length with no or low rotational spring stiffness.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001844360
|
oai_dc
|
A direct damage detection method using Multiple Damage Localization Index Based on Mode Shapes criterion
|
A direct damage detection method using Multiple Damage Localization Index Based on Mode Shapes criterion
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"F. Homaei(Iran University of Science & Technology); S. Shojaee(Shahid Bahonar University); G. Ghodrati Amiri(Iran University of Science & Technology)"
] |
A new method of multiple damage detection in beam like structures is introduced. The mode shapes of both healthy and damaged structures are used in damage detection process (DDP). Multiple Damage Localization Index Based on Mode Shapes (MDLIBMS) is presented as a criterion in detecting damaged elements. A finite element modeling of structures is used to calculate the mode shapes parameters. The main advantages of the proposed method are its simplicity, flexibility on the number of elements and so the accuracy of the damage(s) position(s), sensitivity to small damage extend, capability in prediction of required number of mode shapes and low sensitivity to noisy data. In fact, because of differential and comparative form of MDLIBMS, using noise polluted data doesn’t have major effect on the results. This makes the proposed method a powerful one in damage detection according to measured mode shape data. Because of its flexibility, damage detection process in multi span bridge girders with non-prismatic sections can be done by this method. Numerical simulations used to demonstrate these advantages.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001844362
|
oai_dc
|
Vehicle-bridge coupling vibration analysis based fatigue reliability prediction of prestressed concrete highway bridges
|
Vehicle-bridge coupling vibration analysis based fatigue reliability prediction of prestressed concrete highway bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jinsong Zhu(Tianjin University); Cheng Chen(San Francisco State University); Qinghua Han(Tianjin University)"
] |
The extensive use of prestressed reinforced concrete (PSC) highway bridges in marine environment drastically increases the sensitivity to both fatigue- and corrosion-induced damage of their critical structural components during their service lives. Within this scenario, an integrated method that is capable of evaluating the fatigue reliability, identifying a condition-based maintenance, and predicting the remaining service life of its critical components is therefore needed. To accomplish this goal, a procedure for fatigue reliability prediction of PSC highway bridges is proposed in the present study. Vehicle-bridge coupling vibration analysis is performed for obtaining the equivalent moment ranges of critical section of bridges under typical fatigue truck models. Three-dimensional nonlinear mathematical models of fatigue trucks are simplified as an eleven-degree-of-freedom system. Road surface roughness is simulated as zero-mean stationary Gaussian random processes using the trigonometric series method. The time-dependent stress-concentration factors of reinforcing bars and prestressing tendons are accounted for more accurate stress ranges determination. The limit state functions are constructed according to the Miner’s linear damage rule, the time-dependent S-N curves of prestressing tendons and the site-specific stress cycle prediction. The effectiveness of the methodology framework is demonstrated to a T-type simple supported multi-girder bridge for fatigue reliability evaluation.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001844357
|
oai_dc
|
Safety factor calibration for bridge concrete girders
|
Safety factor calibration for bridge concrete girders
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rita C. Silva(University of Brasilia); Christian Cremona(Ministry of Ecology)"
] |
Safety factors proposed in codes CEB, B.A.E.L 91 and EUROCODE 1 cover a great number of uncertainties; making them inadequate for the assessment of existing structures. Suitable safety factors are established using a probabilistic assessment, once real dimensions, materials strength and existing structures deterioration mechanisms are taken into account. This paper presents a calibration method for safety factors using a typical set of RC bridges in France. It considers the principal stages of corrosion provoked by CO2 and Cl− penetration and threshold indexes (β0) for existing structures. Reliability indexes are determined by the FORM method in the calibration method.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001844370
|
oai_dc
|
An experimental study on the flexural performance of laminated glass
|
An experimental study on the flexural performance of laminated glass
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xiaokun Huang(China Academy of Building Research); Gang Liu(China Academy of Building Research); Qiang Liu(China Academy of Building Research); Stephen J. Bennison(E.I. DuPont de Nemours & Co. Inc.)"
] |
This paper reported an experimental study on creep behaviors of PVB and Ionoplast laminated glass (LG) under load duration of 30 days. The tests were carried out in room temperature (23°C). The study revealed that after sustaining loads for 30 days, the mid-span deflection of PVB LG increased by almost 102% compared with its short term deflection, while that of Ionoplast LG approximately increased by 14%; composite effects between two glass plies in PVB LG gradually reduced with time, but did not fully vanish at the 30th day; two glass plies in Ionoplast LG on the other hand was able to withstand loads as an effective composite section during the entire loading period; the creep behaviors of both LG were not finished yet at the 30th day. In addition to this, also studied was the varying of the bending stresses of PVB and Ionoplast LG under load duration of 2 hours. The tests were carried out in ambient temperatures of 30°C, 50°C and 80°C respectively. It was found that under a given load, although the bending stresses of both LG increased with increasing temperature, for PVB LG the increasing rate of the bending stress decreased with increasing temperature, while for Ionoplast LG the increasing rate of the bending stress increased with increasing temperature.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001844364
|
oai_dc
|
Cold expansion effect on the fatigue crack growth of Al 6082: numerical investigation
|
Cold expansion effect on the fatigue crack growth of Al 6082: numerical investigation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Abdekrim Aid(Université de Mascara); Zahar Semari(Université de Mascara); Mohamed Benguediab(Université de Sidi-Bel-Abbès)"
] |
Cold expansion is an efficient way to improve the fatigue life of an open hole. In this paper, three finite element models have been established to bind the crack growth from an expanded hole and simulated. Expansion and its degree influence are studied using a numerical analysis. Stress intensity factors are determined and used to evaluate the fatigue life. Residual stress field is evaluated using a nonlinear analysis and superposed with the applied stresses field in order to estimate fatigue crack growth.
Experimental tests are conducted under constant loading. Results of this investigation indicate expansion and its degree are beneficial to fatigue life and a good agreement was observed between FEM simulations and experimental results.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001844367
|
oai_dc
|
Modeling of wind-induced fatigue of cold-formed steel sheet panels
|
Modeling of wind-induced fatigue of cold-formed steel sheet panels
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Osvaldo Rosario-Galanes(University of Puerto Rico); Luis A. Godoy(National University of Córdoba)"
] |
Wind-induced failure around screwed connections has been documented in roof and wall cladding systems made with steel sheet cold-formed panels during high wind events. Previous research has found that low cycle fatigue caused by stress concentration and fluctuating wind loads is responsible for most such failures. A dynamic load protocol was employed in this work to represent fatigue under wind effects. A finite element model and fatigue criteria were implemented and compared with laboratory experiments in order to predict the fatigue failure associated with fluctuating wind loads. Results are used to develop an analytical model which can be employed for the fatigue analysis of steel cold-formed cladding systems. Existing three dimensional fatigue criteria are implemented and correlated with fatigue damage observed on steel claddings. Parametric studies are used to formulate suitable yet simple fatigue criteria. Fatigue failure is predicted in different configurations of loads, types of connections, and thicknesses of steel folded plate cladding. The analytical model, which correlated with experimental results reported in acompanion paper, was validated for the fatigue life prediction and failure mechanism of different connection types and thicknesses of cold-formed steel cladding.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001844373
|
oai_dc
|
Elastic flexural and torsional buckling behavior of pre-twisted bar under axial load
|
Elastic flexural and torsional buckling behavior of pre-twisted bar under axial load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chang Hong Chen(Northwestern Polytechnical University); Yao Yao(Northwestern Polytechnical University); Ying Huang(Xi’an University of Architecture and Technology)"
] |
According to deformation features of pre-twisted bar, its elastic bending and torsion buckling equation is developed in the paper. The equation indicates that the bending buckling deformations in two main bending directions are coupled with each other, bending and twist buckling deformations are coupled with each other as well. However, for pre-twisted bar with dual-axis symmetry cross-section, bending buckling deformations are independent to the twist buckling deformation. The research indicates that the elastic torsion buckling load is not related to the pre-twisted angle, and equals to the torsion buckling load of the straight bar. Finite element analysis to pre-twisted bar with different pre-twisted angle is performed , the prediction shows that the assumption of a plane elastic bending buckling deformation curve proposed in previous literature (Shadnam and Abbasnia 2002) may not be accurate, and the curve deviates more from a plane with increasing of the pre-twisting angle. Finally, the parameters analysis is carried out to obtain the relationships between elastic bending buckling critical capacity, the effect of different pre-twisted angles and bending rigidity ratios are studied. The numerical results show that the existence of the pre-twisted angle leads to “resistance” effect of the stronger axis on buckling deformation, and enhances the elastic bending buckling critical capacity. It is noted that the “resistance” is getting stronger and the elastic buckling capacity is higher as the cross section bending rigidity ratio increases.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001816730
|
oai_dc
|
Size-dependent thermal behaviors of axially traveling nanobeams based on a strain gradient theory
|
Size-dependent thermal behaviors of axially traveling nanobeams based on a strain gradient theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Cheng Li(Soochow University)"
] |
This work is concerned with transverse vibrations of axially traveling nanobeams including strain gradient and thermal effects. The strain gradient elasticity theory and the temperature field are taken into consideration. A new higher-order differential equation of motion is derived from the variational principle and the corresponding higher-order non-classical boundary conditions including simple, clamped, cantilevered supports and their higher-order “offspring” are established. Effects of strain gradient nanoscale parameter, temperature change, shape parameter and axial traction on the natural frequencies are presented and discussed through some numerical examples. It is concluded that the factors mentioned above significantly influence the dynamic behaviors of an axially traveling nanobeam. In particular, the strain gradient effect tends to induce higher vibration frequencies as compared to an axially traveling macro beams based on the classical vibration theory without strain gradient effect.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001816663
|
oai_dc
|
A superelement formulation for efficient structural analysis in progressive collapse
|
A superelement formulation for efficient structural analysis in progressive collapse
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xu Long(Nanyang Technological University); Weifeng Yuan(Nanyang Technological University); Kang Hai Tan(Nanyang Technological University); Chi King Lee(Nanyang Technological University)"
] |
An integrated superelement concept is proposed to improve the computational efficiency when analyzing structural responses during progressive collapses of large-scale structures, such as multi-storey reinforced concrete buildings. While the proposed methodology is straightforward and can be implemented into an existing finite element program with little effort, it is able to significantly reduce the computational cost without the loss of any critical information of the structural responses. Compared with the models without superelement, significant saving in computational cost and satisfactory prediction accuracy can be obtained with the proposed approach.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001816655
|
oai_dc
|
Damage detection using the improved Kullback-Leibler divergence
|
Damage detection using the improved Kullback-Leibler divergence
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shaohua Tian(Xi’an Jiaotong University); Xuefeng Chen(Xi’an Jiaotong University); Zhibo Yang(Xi’an Jiaotong University); Zhengjia He(Xi’an Jiaotong University); Xingwu Zhang(Xi’an Jiaotong University)"
] |
Structural health monitoring is crucial to maintain the structural performance safely. Moreover, the Kullback-Leibler divergence (KLD) is applied usually to asset the similarity between different probability density functions in the pattern recognition. In this study, the KLD is employed to detect the damage. However the asymmetry of the KLD is a shortcoming for the damage detection, to overcoming this shortcoming, two other divergences and one statistic distribution are proposed. Then the damage identification by the KLD and its three descriptions from the symmetric point of view is investigated. In order to improve the reliability and accuracy of the four divergences, the gapped smoothing method (GSM) is adopted. On the basis of the damage index approach, the new damage index (DI) for detect damage more accurately based on the four divergences is developed. In the last, the grey relational coefficient and hypothesis test (GRCHT) is utilized to obtain the more precise damage identification results. Finally, a clear remarkable improvement can be observed. To demonstrate the feasibility and accuracy of the proposed method, examples of an isotropic beam with different damage scenarios are employed so as to check the present approaches numerically. The final results show that the developed approach successfully located the damaged region in all cases effect and accurately.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001816712
|
oai_dc
|
Study on critical buckling load calculation method of piles considering passive and active earth pressure
|
Study on critical buckling load calculation method of piles considering passive and active earth pressure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yong-hui Chen(Hohai University); Long Chen(Hohai University); Kai Xu(Nanjing Hydraulic Research Institute); Lin Liu(Hohai University); Charles W.W. Ng(The Hong Kong University of Science and Technology)"
] |
Different types of long slender pile shall buckle with weak soil and liquefied stratum surrounded. Different from considering single side earth pressure, it was suggested that the lateral earth pressure can be divided into two categories while buckling: the earth pressure that prevent and promotes the lateral movement. Active and passive earth pressure calculation model was proposed supposing earth pressure changed linearly with displacement considering overlying load, shaft resistance, earth pressure at both sides of the pile. Critical buckling load calculation method was proposed based on the principle of minimum potential energy quoting the earth pressure calculation model. The calculation result was contrasted with the field test result of small diameter TC pile (Plastic Tube Cast-in-place pile). The fix form could be fixed-hinged in the actual calculation assuring the accuracy and certain safety factor. The contributions of pile fix form depend on the pile length for the same geological conditions. There exists critical friction value in specific geological conditions that the side friction has larger impact on the critical buckling load while it is less than the value and has less impact with larger value. The buckling load was not simply changed linearly with friction. The buckling load decreases with increased limit active displacement and the load tend to be constant with larger active displacement value; the critical buckling load will be the same for different fix form for the small values.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001816700
|
oai_dc
|
Comparison of various refined nonlocal beam theories for bending, vibration and buckling analysis of nanobeams
|
Comparison of various refined nonlocal beam theories for bending, vibration and buckling analysis of nanobeams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H.M. Berrabah(Université de Sidi Bel Abbes); Abdelouahed Tounsi(Université de Sidi Bel Abbes); Abdelwahed Semmah(Université de Sidi Bel Abbés); E.A. Adda Bedia(Université de Sidi Bel Abbes)"
] |
In this paper, unified nonlocal shear deformation theory is proposed to study bending, buckling and free vibration of nanobeams. This theory is based on the assumption that the in-plane and transverse displacements consist of bending and shear components in which the bending components do not contribute toward shear forces and, likewise, the shear components do not contribute toward bending moments. In addition, this present model is capable of capturing both small scale effect and transverse shear deformation effects of nanobeams, and does not require shear correction factors. The equations of motion are derived from Hamilton‟s principle. Analytical solutions for the deflection, buckling load, and natural frequency are presented for a simply supported nanobeam, and the obtained results are compared with those predicted by the nonlocal Timoshenko beam theory and Reddy beam theories.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001816725
|
oai_dc
|
Mechanical performance and design optimization of rib-stiffened super-wide bridge deck with twin box girders in concrete
|
Mechanical performance and design optimization of rib-stiffened super-wide bridge deck with twin box girders in concrete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wen Xiong(Southeast University); Jianshu Ye(Southeast University); Xuemei Gai(Southeast University); C.S. Cai(Louisiana State University)"
] |
The present study fundamentally investigated the mechanical performance of the rib-stiffened super-wide bridge deck with twin box girders in concrete, which is a very popular application to efficiently widen the bridges with normal span. The shear lag effects of the specific cross-sections were firstly studied. The spatial stress distribution and local stiffness of the bridge deck with twin box girders were then investigated under several typical wheel load conditions. Meanwhile, a comparative study for the bridge deck with and without stiffening ribs was also carried out during the investigation; thereby, a design optimization for the stiffening ribs was further suggested. Finally, aiming at the preliminary design, an approximate methodology to manually calculate the bending moments of the rib-stiffened bridge deck was analytically proposed for engineers to quickly assess its performance. This rib-stiffened bridge deck with twin box girders can be widely applied for concrete (especially concrete cable-stayed) bridges with normal span, however, requiring a super-wide bridge width due to the traffic flow.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001816721
|
oai_dc
|
Cold-formed steel channel columns optimization with simulated annealing method
|
Cold-formed steel channel columns optimization with simulated annealing method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Moacir Kripka(University of Passo Fundo); Zacarias Martin Chamberlain Pravia(University of Passo Fundo)"
] |
Cold-formed profiles have been largely used in the building industry because they can be easily produced and because they allow for a wide range of sections and thus can be utilized to meet different project requirements. Attainment of maximum performance by structural elements with low use of material is a challenge for engineering projects. This paper presents a numerical study aimed at minimizing the weight of lipped and unlipped cold-formed channel columns, following the AISI 2007 specification. Flexural, torsional and torsional–flexural buckling of columns was considered as constraints. The simulated annealing method was used for optimization. Several numerical simulations are presented and discussed to validate the proposal, in addition to an experimental example that qualifies its implementation. The ratios between lips, web width, and flange width are analyzed. Finally, it may be concluded that the optimization process yields excellent results in terms of cross-sectional area reduction.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001816672
|
oai_dc
|
Structural seismic response versus epicentral distance and natural period: the case study of Boumerdes (Algeria) 2003 earthquake
|
Structural seismic response versus epicentral distance and natural period: the case study of Boumerdes (Algeria) 2003 earthquake
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Dorbani(Built Environment Lab.); M. Badaoui(Construction Supply & Services Integrated); D. Benouar(Built Environment Lab.)"
] |
This paper deals with the development of expressions relating structural seismic response parameters to the epicentral distances of an earthquake and the natural period of several reinforced concrete buildings (6, 9 and 12 storey), with three floor plans: symmetric, monosymmetric, and unsymmetric. These structures are subjected to seismic spectrum of accelerations collected during the Boumerdes earthquake (Algeria, May 21st, 2003, Mw=6.8) at different epicentral distances. The objective of this study is to develop relations between structural responses namely: base shear, storey displacements, interstory drifts and epicentral distance and fundamental period for a given earthquake. The seismic response of the buildings is carried out in both longitudinal transverse and directions by the response spectrum method (modal spectral approach).
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001750778
|
oai_dc
|
Out-of-plane elastic buckling of truss beams
|
Out-of-plane elastic buckling of truss beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Alexis Fedoroff(Aalto University); Reijo Kouhia(Tampere University of Technology)"
] |
In this article we will present a method to directly evaluate the critical point of a non-linear system by using the solution of a polynomial eigenvalue approximation as a starting point for an iterative non-linear system solver. This method will be used to evaluate out-of-plane buckling properties of truss structures for which the lateral displacement of the upper chord has been prevented. The aim is to assess for a number of example structures whether or not the linearized eigenvalue solution gives a relevant starting point for an iterative non-linear system solver in order to find the minimum positive critical load.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001750779
|
oai_dc
|
Power series solution of circular membrane under uniformly distributed loads: investigation into Hencky transformation
|
Power series solution of circular membrane under uniformly distributed loads: investigation into Hencky transformation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jun-yi Sun(Chongqing University); Yang Rong(Chongqing University); Xiao-ting He(Chongqing University); Xiao-wei Gao(Chongqing University); Zhou-lian Zheng(Chongqing University)"
] |
In this paper, the problem of axisymmetric deformation of the circular membrane fixed at its perimeter under the action of uniformly-distributed loads was resolved by exactly using power series method, and the solution of the problem was presented. An investigation into the so-called Hencky transformation was carried out, based on the solution presented here. The results obtained here indicate that the well-known Hencky solution is, without doubt, correct, but in the published papers the statement about its derivation is incorrect, and the so-called Hencky transformation is invalid and hence may not be extended to use as a general mathematical method.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001750764
|
oai_dc
|
A comparative study of three collocation point methods for odd order stochastic response surface method
|
A comparative study of three collocation point methods for odd order stochastic response surface method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Dian-Qing Li(Wuhan University); Shui-Hua Jiang(Wuhan University); Yong-Gang Cheng(Wuhan University); Chuang-Bing Zhou(Wuhan University)"
] |
This paper aims to compare three collocation point methods associated with the odd order stochastic response surface method (SRSM) in a systematical and quantitative way. The SRSM with the Hermite polynomial chaos is briefly introduced first. Then, three collocation point methods, namely the point method, the root method and the without origin method underlying the odd order SRSMs are highlighted. Three examples are presented to demonstrate the accuracy and efficiency of the three methods. The results indicate that the condition that the Hermite polynomial information matrix evaluated at the collocation points has a full rank should be satisfied to yield reliability results with a sufficient accuracy. The point method and the without origin method are much more efficient than the root method, especially for the reliability problems involving a large number of random variables or requiring complex finite element analysis. The without origin method can also produce sufficiently accurate reliability results in comparison with the point and root methods. Therefore, the origin often used as a collocation point is not absolutely necessary. The odd order SRSMs with the point method and the without origin method are recommended for the reliability analysis due to their computational accuracy and efficiency. The order of SRSM has a significant influence on the results associated with the three collocation point methods. For normal random variables, the SRSM with an order equaling or exceeding the order of a performance function can produce reliability results with a sufficient accuracy. The order of SRSM should significantly exceed the order of the performance function involving strongly non-normal random variables.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001750783
|
oai_dc
|
A novel regression prediction model for structural engineering applications
|
A novel regression prediction model for structural engineering applications
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jeng-Wen Lin(Feng Chia University); Cheng-Wu Chen(National Kaohsiung Marine University); Ting-Chang Hsu(Feng Chia University)"
] |
Recently, artificial intelligence tools are most used for structural engineering and mechanics. In order to predict reserve prices and prices of awards, this study proposed a novel regression prediction model by the intelligent Kalman filtering method. An artificial intelligent multiple regression model was established using categorized data and then a prediction model using intelligent Kalman filtering. The rather precise construction bid price model was selected for the purpose of increasing the probability to win bids in the simulation example.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001750780
|
oai_dc
|
Optimum cost design of RC columns using artificial bee colony algorithm
|
Optimum cost design of RC columns using artificial bee colony algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hasan Tahsin Ozturk(Karadeniz Technical University); Ahmet Durmus(Karadeniz Technical University)"
] |
Optimum cost design of columns subjected to axial force and uniaxial bending moment is presented in this paper. In the formulation of the optimum design problem, the height and width of the column, diameter and number of reinforcement bars are treated as design variables. The design constraints are implemented according to ACI 318-08 and studies in the literature. The objective function is taken as the cost of unit length of the column consisting the cost of concrete, steel, and shuttering. The solution of the design problem is obtained using the artificial bee colony algorithm which is one of the recent additions to metaheuristic techniques. The Artificial Bee Colony Algorithm is imitated the foraging behaviors of bee swarms. In application of this algorithm to the constraint problem, Deb's constraint handling method is used. Obtained results showed that the optimum value of numerical example is nearly same with the existing values in the literature.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001750781
|
oai_dc
|
Soil structure interaction effects on structural parameters for stiffness degrading systems built on soft soil sites
|
Soil structure interaction effects on structural parameters for stiffness degrading systems built on soft soil sites
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Müberra Eser Aydemir(Istanbul Aydin University)"
] |
In this study, strength reduction factors and inelastic displacement ratios are investigated for SDOF systems with period range of 0.1-3.0 s considering soil structure interaction for earthquake motions recorded on soft soil. The effect of stiffness degradation on strength reduction factors and inelastic displacement ratios is investigated. The modified-Clough model is used to represent structures that exhibit significant stiffness degradation when subjected to reverse cyclic loading and the elastoplastic model is used to represent non-degrading structures. The effect of negative strain – hardening on the inelastic displacement and strength of structures is also investigated. Soil structure interacting systems are modeled and analyzed with effective period, effective damping and effective ductility values diff ering from fixed-base case. For inelastic time history analyses, Newmark method for step by step time integration was adapted in an inhouse computer program. New equations are proposed for strength reduction factor and inelastic displacement ratio of interacting system as a function of structural period (T̃, T), ductility (μ) and period lengthening ratio (T̃/T).
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001750784
|
oai_dc
|
Concrete arch bridges built by lattice cantilevers
|
Concrete arch bridges built by lattice cantilevers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Michele Fabio Granata(Università di Palermo); Piercarlo Margiotta(Università di Palermo); Antonino Recupero(Università di Messina); Marcello Arici(Università di Palermo)"
] |
In this paper a study about concrete arch bridges built by lattice cantilevers is presented. Lattice cantilevers are partial structures composed of deck, arch, piers and provisional steel diagonals, organized as reticular cantilever girders, in order to build arch bridges without the use of centrings, supports or temporary towers. Characteristics of this construction methodology with its variants are explained together with their implications in the erection sequence. Partial elastic scheme method is implemented in order to find initial forces of temporary cables and a forward analysis is carried out to follow the actual sequence of construction, by extending a procedure already applied to concrete cable–stayed bridges and to arches built by the classical suspended cantilever method. A numerical application on a case–study of a concrete arch bridge is performed together with a comparison between different methodologies followed for its construction sequence. Differences between erection by lattice cantilevers and cable-stayed cantilevers, are discussed. Results can be useful for designers in conceptual design of concrete arch bridges.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001750782
|
oai_dc
|
Pressure loading, end- shortening and through- thickness shearing effects on geometrically nonlinear response of composite laminated plates using higher order finite strip method
|
Pressure loading, end- shortening and through- thickness shearing effects on geometrically nonlinear response of composite laminated plates using higher order finite strip method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad H. Sherafat(McGill University); Seyyed Amir M. Ghannadpour(ShahidBeheshti University); Hamid R. Ovesy(Amirkabir University of Technology)"
] |
A semi-analytical finite strip method is developed for analyzing the post-buckling behavior of rectangular composite laminated plates of arbitrary lay-up subjected to progressive end-shortening in their plane and to normal pressure loading. In this method, all the displacements are postulated by the appropriate harmonic shape functions in the longitudinal direction and polynomial interpolation functions in the transverse direction. Thin or thick plates are assumed and correspondingly the Classical Plate Theory (CPT)or Higher Order Plate Theory (HOPT) is applied. The in-plane transverse deflection is allowed at the loaded ends of the plate, whilst the same deflection at the unloaded edges is either allowed to occur or completely restrained. Geometric non-linearity is introduced in the strain–displacement equations in the manner of the von-Karman assumptions. The formulations of the finite strip methods are based on the concept of the principle of the minimum potential energy. The Newton–Raphson method is used to solve the non-linear equilibrium equations. A number of applications involving isotropic plates, symmetric and unsymmetric cross-ply laminates are described to investigate the through-thickness shearing effects as well as the effect of pressure loading, end-shortening and boundary conditions. The study of the results has revealed that the response of the composite laminated plates is particularly influenced by the application of the Higher Order Plate Theory (HOPT) and normal pressure loading. In the relatively thick plates, the HOPT results have more accuracy than CPT.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001849912
|
oai_dc
|
Autogenous shrinkage of ultra high performance concrete considering early age coefficient of thermal expansion
|
Autogenous shrinkage of ultra high performance concrete considering early age coefficient of thermal expansion
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"박정준(한국건설기술연구원); 류두열(고려대학교); 김성욱(한국건설기술연구원); 윤영수(고려대학교)"
] |
The recently developed Ultra High Performance Concrete (UHPC) displays outstanding compressive strength and ductility but is also subjected to very large autogenous shrinkage. In addition, the use of forms and reinforcement to confine this autogenous shrinkage increases the risk of shrinkage cracking. Accordingly, this study adopts a combination of shrinkage reducing admixture and expansive admixture as a solution to reduce the shrinkage of UHPC and estimates its appropriateness by evaluating the compressive and flexural strengths as well as the autogenous shrinkage according to the age. Moreover, the coefficient of thermal expansion known to experience sudden variations at early age is measured in order to evaluate exactly the autogenous shrinkage and the thermal expansion is compensated considering these measurements. The experimental results show that the compressive and flexural strengths decreased slightly at early age when mixing 7.5% of expansive admixture and 1% of shrinkage reducing admixture but that this decrease becomes insignificant after 7 days. The use of expansive admixture tended to premature thesetting of UHPC and the start of sudden increase of autogenous shrinkage. Finally, the combined use of shrinkage reducing admixture and expansive admixture appeared to reduce effectively the autogenousshrinkage by about 47% at 15 days.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001849918
|
oai_dc
|
A new finite element based on the strain approach with transverse shear effect
|
A new finite element based on the strain approach with transverse shear effect
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammed Himeur(Mentouri University); Abdelaziz Benmarce(1945 University); Mohamed Guenfoud(Guelma University)"
] |
This research work deals with the development of a new Triangular finite element for the linear analysis of plate bending with transverse shear effect. It is developed in perspective to building shell elements. The displacements field of the element has been developed by the use of the strain-based approach and it is based on the assumed independent functions for the various components of strain insofar as it is allowed by the compatibility equations. Its formulation uses also concepts related to the fourth fictitiousnode, the static condensation and analytic integration. It is based on the assumptions of tick plate‟s theory (Reissner-Mindlin theory). The element possesses three essential external degrees of freedom at each of the four nodes and satisfies the exact representation of the rigid body modes of displacements. As a result of this approach, a new bending plate finite element (Pep43) which is competitive, robust and efficient.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001849905
|
oai_dc
|
Geometrically nonlinear analysis of planar beam and frame structures made of functionally graded material
|
Geometrically nonlinear analysis of planar beam and frame structures made of functionally graded material
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Dinh-Kien Nguyen(Vietnam Academy of Science and Technology); Buntara S. Gan(Nihon University); Thanh-Huong Trinh(Vietnam Academy of Science and Technology)"
] |
Geometrically nonlinear analysis of planar beam and frame structures made of functionally graded material (FGM) by using the finite element method is presented. The material property of the structures is assumed to be graded in the thickness direction by a power law distribution. A nonlinear beam element based on Bernoulli beam theory, taking the shift of the neutral axis position into account, is formulated in the context of the co-rotational formulation. The nonlinear equilibrium equations are solved by using the incremental/iterative procedure in a combination with the arc-length control method. Numerical examples show that the formulated element is capable to give accurate results by using just several elements.
The influence of the material inhomogeneity in the geometrically nonlinear behavior of the FGM beam and frame structures is examined and highlighted.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001849916
|
oai_dc
|
Column-loss response of RC beam-column sub-assemblages with different bar-cutoff patterns
|
Column-loss response of RC beam-column sub-assemblages with different bar-cutoff patterns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Meng-Hao Tsai(National Pingtung University of Science and Technology); Jun-Kai Lu(National Pingtung University of Science and Technology); Bo-Hong Huang(National Pingtung University of Science and Technology)"
] |
Static loading tests were carried out in this study to investigate the effect of bar cutoff on the resistance of RC beam-column sub-assemblages under column loss. Two specimens were designed withcontinuous main reinforcement. Four others were designed with different types of bar cutoff in the mid-span and/or the beam-end regions. Compressive arch and tensile catenary responses of the specimens under gravitational loading were compared. Test results indicated that those specimens with approximately equal moment strength at the beam ends had similar peak loading resistance in the compressive arch phase but varied resistance degradation in the transition phase because of bar cutoff. The compressive bars terminated at one-third span could help to mitigate the degradation although they had minor contribution to the catenary action. Among those cutoff patterns, the K-type cutoff presented the best strength enhancement. It revealedthat it is better to extend the steel bars beyond the mid-span before cutoff for the two-span beams bridgingover a column vulnerable to sudden failure. For general cutoff patterns dominated by gravitational and seismic designs, they may be appropriately modified to minimize the influence of bar cutoff on the progressive collapse resistance.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001849897
|
oai_dc
|
Vibration control of 3D irregular buildings by using developed neuro-controller strategy
|
Vibration control of 3D irregular buildings by using developed neuro-controller strategy
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yasser Bigdeli(Kunsan National University); 김두기(군산대학교); 장성규(군산대학교)"
] |
This paper develops a new nonlinear model for active control of three-dimensional (3D) irregular building structures. Both geometrical and material nonlinearities with a neuro-controller training algorithm are applied to a multi-degree-of-freedom 3D system. Two dynamic assembling motions are considered simultaneously in the control model such as coupling between torsional and lateral responses of the structure and interaction between the structural system and the actuators. The proposed control system and training algorithm of the structural system are evaluated by simulating the responses of the structure under the El-Centro 1940 earthquake excitation. In the numerical example, the 3D three-story structure with linear and nonlinear stiffness is controlled by a trained neural network. The actuator dynamics, control time delay and incident angle of earthquake are also considered in the simulation. Results show that the proposed control algorithm for 3D buildings is effective in structural control.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001849909
|
oai_dc
|
Research on the mechanical properties of membrane connections in tensioned membrane structures
|
Research on the mechanical properties of membrane connections in tensioned membrane structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yingying Zhang(Tongji University); Qilin Zhang(Tongji University); Yang Li(Shanghai Urban Construction and Communications Commission); Lu Chen(Shanghai Tongji Construction Quality Inspection Station)"
] |
As an important part, the connections generally are important for the overall behavior of the structure and the strength and serviceability of the connection should be ensured. This paper presents the mechanical properties of membrane connections in tensioned membrane structure. First, the details of common connections used in the membrane structure are introduced. Then, the common connections including membrane seam, membrane-flexible edge connection and membrane-rigid edge connection are tested and the corresponding failure mechanisms are discussed. Finally, the effects of connection parameters on the connection strength are investigated and proper connection parameters are proposed. The strength reduction factors corresponding to different connection types are proposed, which can be references for the design and analysis of membrane structures.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001849904
|
oai_dc
|
Computational analysis and design formula development for the design of curved plates for ships and offshore structures
|
Computational analysis and design formula development for the design of curved plates for ships and offshore structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김주현(부산대학교); 박주신(Samsung Heavy Industries Co.); 이경훈(Sungdong Shipbuilding & Marine Engineering Co.); 김정현(부산대학교); 김명현(부산대학교); 이제명(부산대학교)"
] |
In general, cylindrically curved plates are used in ships and offshore structures such as windtowers, spa structures, fore and aft side shell plating, and bilge circle parts in merchant vessels. In a numberof studies, it has been shown that curvature increases the buckling strength of a plate under compressiveloading, and the ultimate load-carrying capacity is also expected to increase. In the present paper, a series ofelastic and elastoplastic large deflection analyses were performed using the commercial finite elementanalysis program (MSC.NASTRAN/PATRAN) in order to clarify and examine the fundamental bucklingand collapse behaviors of curved plates subjected to combined axial compression and lateral pressure. Onthe basis of the numerical results, the effects of curvature, the magnitude of the initial deflection, theslenderness ratio, and the aspect ratio on the characteristics of the buckling and collapse behavior of thecurved plates are discussed. On the basis of the calculated results, the design formula was developed topredict the buckling and ultimate strengths of curved plates subjected to combined loads in an analyticalmanner. The buckling strength behaviors were simulated by performing elastic large deflection analyses.
The newly developed formulations were applied in order to perform verification analyses for the curvedplates by comparing the numerical results, and then, the usefulness of the proposed method wasdemonstrated.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001849895
|
oai_dc
|
Strengthening of RC beams with prefabricated RC U cross-sectional plates
|
Strengthening of RC beams with prefabricated RC U cross-sectional plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ali Demir(Celal Bayar University); Muhammed Tekin(Celal Bayar University); Tezcan Turalı(Celal Bayar University); Muhiddin Bagci(Celal Bayar University)"
] |
The topic of this study is to strengthen cracked beams with prefabricated RC U cross-sectional plates. The damaged beams were repaired by epoxy based glue. The repaired beams were strengthened using prefabricated plates. The strengthening plates were bonded to the bottom and side faces of the beams by anchorage rods and epoxy. The strengthened beams were incrementally loaded up to maximum load capacities. The experimental results were satisfactory since the load carrying capacities of damaged beams were increased approximately 76% due to strengthening. It was observed that strengthening plates had a dominant effect on the performance of beams in terms of both the post-elastic strength enhancement and the ductility. The experimental program was supported by a three-dimensional nonlinear finite element analysis. The experimental results were compared with the results obtained from the beam modeled with ANSYS finite element program.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001826778
|
oai_dc
|
Stochastic analysis of elastic wave and second sound propagation in media with Gaussian uncertainty in mechanical properties using a stochastic hybrid mesh-free method
|
Stochastic analysis of elastic wave and second sound propagation in media with Gaussian uncertainty in mechanical properties using a stochastic hybrid mesh-free method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Seyed Mahmoud Hosseini(Ferdowsi University of Mashhad); Farzad Shahabian(Ferdowsi University of Mashhad)"
] |
The main objective of this article is the exploitation of a stochastic hybrid mesh-free method based on stochastic generalized finite difference (SGFD), Newmark finite difference (NFD) methods and Monte Carlo simulation for thermoelastic wave propagation and coupled thermoelasticity analysis based on GN theory (without energy dissipation). A thick hollow cylinder with Gaussian uncertainty in mechanical properties is considered as an analyzed domain for the problem. The effects of uncertainty in mechanical properties with various coefficients of variations on thermo-elastic wave propagation are studied in details. Also, the time histories and distribution on thickness of cylinder of maximum, mean and variance values of temperature and radial displacement are studied for various coefficients of variations (COVs).
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001826782
|
oai_dc
|
Flexural bond strength behaviour in OPC concrete of NBS beam for various corrosion levels
|
Flexural bond strength behaviour in OPC concrete of NBS beam for various corrosion levels
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Akshatha Shetty(National Institute of Technology); Katta Venkataramana(National Institute of Technology); K.S. Babu Narayan(National Institute of Technology)"
] |
Corrosion is one of the primary reasons why structures have limited durability. The present investigation is carried out to study the behavior of RC (Reinforced Concrete) structural members subjected to corrosion. Experimental investigations were carried out on National Bureau of Standard (NBS), RC beam specimens made of Ordinary Portland Cement (OPC) concrete. Load versus deflection behaviour was studied for different levels of corrosion i.e., 2.5%, 5%, 7.5% and 10%. It is observed that for every percentage increase in corrosion level, there is about 1.6% decrease in load carrying capacity. Also as the amount of corrosion increases there is a reduction in bond stress.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001826789
|
oai_dc
|
Experimental investigation of characteristics of torsional wind loads on rectangular tall buildings
|
Experimental investigation of characteristics of torsional wind loads on rectangular tall buildings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yi Li(Hunan University); J.W. Zhang(City University of Hong Kong); Q.S. Li(City University of Hong Kong)"
] |
In order to investigate the characteristics of torsional wind loads on rectangular tall buildings, five models with different rectangular cross-sections were tested in a boundary wind tunnel. Based on the test results, the RMS force coefficients, power spectrum densities as well as vertical correlation functions of torsional wind loads were analyzed. Formulas that took the side ratio as parameters were proposed to fit the test results above. Comparisons between the results calculated by the formulas and the wind tunnel measurements were made to verify the reliability of the proposed formulas. An simplified expression to evaluate the dynamic torsional wind loads on rectangular tall buildings in urban terrain is presented on basis of the above formulas and has been proved by a practical project. The simplified expressions as well as the proposed formulas can be applied to estimate wind-induce torsional response on rectangular tall buildings in the frequency domain.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001826777
|
oai_dc
|
Influence of the axial force on the behavior of endplate moment connections
|
Influence of the axial force on the behavior of endplate moment connections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mehdi Ghassemieh(University of Tehran); Iman Shamim(McGill University); Ali Akbar Gholampour(University of Tehran)"
] |
In this article, using finite element method of analysis (FEM), behavior of the endplate moment connection subjected to axial force and bending moment is investigated. In the FEM model, all the nonlinear characteristics such as material, geometry, as well as contact have been included. First, in order to verify the numerical model of the connection, an analysis of the endplate moment connection conducted without the application of the axial force. Results obtained from FEM indicating a close and good correlation with the experimental results. Then to investigate the influence of the axial forces, the connections subjected to axial forces as well as the bending moment are analyzed. To observe the overall effect of these actions, the momentaxial force interaction diagrams are drawn. It is observed that the presence of axial force even in a small value can change the behavior of the connection significantly. It is also shown that the axial forces can alter the failure mode of the connection; and therefore it could result in a different than the predicted moment capacity of the connection.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001826780
|
oai_dc
|
Cost optimization of reinforced high strength concrete T-sections in flexure
|
Cost optimization of reinforced high strength concrete T-sections in flexure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"B. Tiliouine(Ecole Nationale Polytechnique); F. Fedghouche(Ecole Nationale Polytechnique)"
] |
This paper reports on the development of a minimum cost design model and its application for obtaining economic designs for reinforced High Strength Concrete (HSC) T-sections in bending under ultimate limit state conditions. Cost objective functions, behavior constraint including material nonlinearities of steel and HSC, conditions on strain compatibility in steel and concrete and geometric design variable constraints are derived and implemented within the Conjugate Gradient optimization algorithm. Particular attention is paid to problem formulation, solution behavior and economic considerations. A typical example problem is considered to illustrate the applicability of the minimum cost design model and solution methodology. Results are confronted to design solutions derived from conventional design office methods to evaluate the performance of the cost model and its sensitivity to a wide range of unit cost ratios of construction materials and various classes of HSC described in Eurocode2. It is shown, among others that optimal solutions achieved using the present approach can lead to substantial savings in the amount of construction materials to be used. In addition, the proposed approach is practically simple, reliable and computationally effective compared to standard design procedures used in current engineering practice.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001826775
|
oai_dc
|
Influence of wall flexibility on dynamic response of cantilever retaining walls
|
Influence of wall flexibility on dynamic response of cantilever retaining walls
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tufan Cakir(Gümüşhane University)"
] |
A seismic evaluation is made of the response to horizontal ground shaking of cantilever retaining walls using the finite element model in three dimensional space whose verification is provided analytically through the modal analysis technique in case of the assumptions of fixed base, complete bonding behavior at the wall-soil interface, and elastic behavior of soil. Thanks to the versatility of the finite element model, the retained medium is then idealized as a uniform, elastoplastic stratum of constant thickness and semi-infinite extent in the horizontal direction considering debonding behavior at the interface in order to perform comprehensive soil-structure interaction (SSI) analyses. The parameters varied include the flexibility of the wall, the properties of the soil medium, and the characteristics of the ground motion. Two different finite element models corresponding with flexible and rigid wall configurations are studied for six different soil types under the effects of two different ground motions. The response quantities examined incorporate the lateral displacements of the wall relative to the moving base and the stresses in the wall in all directions. The results show that the wall flexibility and soil properties have a major effect on seismic behavior of cantilever retaining walls and should be considered in design criteria of cantilever walls. Furthermore, the results of the numerical investigations are expected to be useful for the better understanding and the optimization of seismic design of this particular type of retaining structure.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001826784
|
oai_dc
|
Non linear soil structure interaction of space frame-pile foundation-soil system
|
Non linear soil structure interaction of space frame-pile foundation-soil system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H.S. Chore(Datta Meghe College of Engineering); R.K. Ingle(Visvesvaraya National Institute of Technology); V.A. Sawant(Indian Institute of Technology Roorkee)"
] |
The study deals with physical modeling of space frame- pile foundation and soil system using finite element models. The superstructure frame is analyzed using complete three -dimensional finite element method where the component of the frame such as slab, beam and columns are descretized using 20 node isoparametric continuum elements. Initially, the frame is analyzed assuming the fixed column bases. Later the pile foundation is worked out separately wherein the simplified models of finite elements such as beam and plate element are used for pile and pile cap, respectively. The non-linear behaviour of soil mass is incorporated by idealizing the soil as non-linear springs using p-y curve along the lines similar to that by Georgiadis et al. (1992). For analysis of pile foundation, the non-linearity of soil via p-y curve approach is incorporated using the incremental approach. The interaction analysis is conducted for the parametric study. The non-linearity of soil is further incorporated using iterative approach, i.e., secant modulus approach, in the interaction analysis. The effect the various parameters of the pile foundation such as spacing in a group and configuration of the pile group is evaluated on the response of superstructure owing to non-linearity of the soil. The response included the displacement at the top of the frame and bending moment in columns. The non-linearity of soil increases the top displacement in the range of 7.8 %- 16.7%. However, its effect is found very marginal on the absolute maximum moment in columns. The hogging moment decreases by 0.005% while sagging moment increases by 0.02%.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001826787
|
oai_dc
|
Capabilities of stochastic response surface method and response surface method in reliability analysis
|
Capabilities of stochastic response surface method and response surface method in reliability analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shui-Hua Jiang(Wuhan University); Dian-Qing Li(Wuhan University); Chuang-Bing Zhou(Wuhan University); Li-Min Zhang(The Hong Kong University of Science and Technology)"
] |
The stochastic response surface method (SRSM) and the response surface method (RSM) are often used for structural reliability analysis, especially for reliability problems with implicit performance functions. This paper aims to compare these two methods in terms of fitting the performance function, accuracy and efficiency in estimating probability of failure as well as statistical moments of system output response. The computational procedures of two response surface methods are briefly introduced first. Then their capabilities are demonstrated and compared in detail through two examples. The results indicate that the probability of failure mainly reflects the accuracy of the response surface function (RSF) fitting the performance function in the vicinity of the design point, while the statistical moments of system output response reflect the accuracy of the RSF fitting the performance function in the entire space. In addition, the performance function can be well fitted by the SRSM with an optimal order polynomial chaos expansion both in the entire physical and in the independent standard normal spaces. However, it can be only well fitted by the RSM in the vicinity of the design point. For reliability problems involving random variables with approximate normal distributions, such as normal, lognormal, and Gumbel Max distributions, both the probability of failure and statistical moments of system output response can be accurately estimated by the SRSM, whereas the RSM can only produce the probability of failure with a reasonable accuracy.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001846108
|
oai_dc
|
Nonlinear dynamic analysis of laterally loaded pile
|
Nonlinear dynamic analysis of laterally loaded pile
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Mehndiratta(Indian Institute of Technology Roorkee); V.A. Sawant(Indian Institute of Technology Roorkee); N.K. Samadhiya(Indian Institute of Technology Roorkee)"
] |
In the present study a parametric analysis is conducted to study the effect of pile dimension and soil properties on the nonlinear dynamic response of pile subjected to lateral sinusoidal load at the pile head. The study is conducted on soil-pile model of different pile diameter, pile length and soil modulus, and results are compared to get the effect. The soil-pile system is modelled using Finite element method. The programming is done in MATLAB. Time history analysis of model is done for varying non-dimensional frequency of load and the results are compared to get the non-dimensional frequency at which pile head displacement is maximum in each case. Maximum possible bending moment and soil-pile interacting forces for the dynamic excitation of the pile is also compared. When results are compared with the linear response, it is observed that non-dimensional frequency is reduced in nonlinear response on account of reduction in the soil stiffness due to yielding. Nonlinear response curve shows high amplitude as compared to linear response curve.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001846107
|
oai_dc
|
Seismic performance evaluation and retrofitting with viscous fluid dampers of an existing bridge in Istanbul
|
Seismic performance evaluation and retrofitting with viscous fluid dampers of an existing bridge in Istanbul
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Guliz Bayramoglu(Istanbul Technical University); Alpay Ozgen(Istanbul Technical University); Enver Altınok(Altinok Consulting and Engineering)"
] |
In this paper, seismic performance of Kozyatagi Bridge is evaluated by employing nonlinear elasto-plastic dynamic analysis and the deformation-based performance. The time-history records of the 1999 Izmit, 1971 San Fernando and 1989 Loma Prieta earthquakes are modified by adopting a probability of exceedance of 2% in 50 years corresponding to the return period of 2475 years. The analysis is carried out for three different bearing cases which are movable bearings, restrained bearings, and movable bearings with viscous fluid dampers in the radial direction. The analysis results show that the bridge can be retrofitted with viscous fluid dampers. In this case the reinforced concrete piers need not be strengthened by any jacketing techniques in order to preserve the original architectural appearance of the bridge. The retrofitting design of the bridge with viscous fluid dampers is also presented in detail.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001846117
|
oai_dc
|
Strengthening methods for existing wall type structures by installing additional shear walls
|
Strengthening methods for existing wall type structures by installing additional shear walls
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"정란(단국대학교); 박태원(단국대학교); 황지현(한국건설기술연구원)"
] |
Before incorporating the earthquake-resistance design in design standard (1988) in South Korea, most of existing residential buildings were built without having lateral resistance capacity in addition to their structural peculiarity, such as exterior stair ways, exterior elevator room. For these reasons, the demands on retrofitting research for existing buildings arise recently and many retrofitting methods are proposed. These tasks are important to reduce the enormous economic loss and environmental issues. As the main purpose, this study was intended to examine the performance improvement in terms of ductility and strength in the wake of retrofitting and to suggest retrofitting details.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001846101
|
oai_dc
|
Theoretical modelling of post - buckling contact interaction of a drill string with inclined bore-hole surface
|
Theoretical modelling of post - buckling contact interaction of a drill string with inclined bore-hole surface
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"V.I. Gulyayev(National Transport University); E.N. Andrusenko(National Transport University); N.V. Shlyun(National Transport University)"
] |
At present, the time of easy oil and gas is over. Now, the largest part of fossil fuels is concentrated in the deepest levels of tectonic structures and in the sea shelves. One of the most cumbersome operations of their extraction is the bore-hole drilling. In connection with austere tectonic and climate conditions, their drivage every so often is associated with great and diversified technological difficulties causing emergencies on frequent occasions. As a rule, they are linked with drill string accidents. A key role in prediction of these situations should play methods of theoretical modelling. For this reason, there is a growing need for development and implementation of new numerical methods for computer simulation of critical and post-critical behavior of drill strings (DSs). In this paper, the processes of non-linear deforming of a DS in cylindrical cavity of a deep bore-hole are considered. On the basis of the theory of curvilinear flexible rods, non-linear constitutive differential equations are deduced. The effects of the longitudinal nonuniform preloading, action of torque and interaction between the DS and the bore-hole surface are taken into account. Owing to the use of curvilinear coordinates in the constraining cylindrical surface and a specially chosen concomitant reference frame, it became possible to separate the desired variables and to reduce the total order of the equation system. To solve it, the method of continuation the solution by parameter and the transfer matrix technique are applied. As a result of the completed numerical analysis, the critical states of the DS loading in the cylindrical channels of inclined bore-holes are found. It is shown that the modes of the post-critical deforming of the DS are associated with its irregular spiral curving prevailing in the zone of bottom-hole-assembly. The possibility of invariant state generation during post-critical deforming is established, condition of its bifurcation is formulated. It is shown that infinite variety of loads can correspond to one geometrical configuration of the DS. They differ each from other by contact force functions.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001846104
|
oai_dc
|
Ductility of concrete slabs reinforced with low-ductility welded wire fabric and steel fibers
|
Ductility of concrete slabs reinforced with low-ductility welded wire fabric and steel fibers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rabin Tuladhar(James Cook University); Benjamin J. Lancini(GHD)"
] |
The use of low-ductility welded wire fabric (WWF) as a main tensile reinforcement in concrete slabs compromises the ductility of concrete structures. Lower ductility in concrete structures can lead to brittle and catastrophic failure of the structures. This paper presents the experimental study carried out on eight simply supported one-way slabs to study the structural behavior of concrete slabs reinforced with lowductility WWF and steel fibers. The different types of steel fibers used were crimped fiber, hooked-end fiber and twincone fiber. The experimental results show that the ductility behavior of the slab specimens with low-ductility reinforcement was significantly improved with the inclusion of 40kg/m3 of twincone fiber. Distribution of cracks was prominent in the slabs with twincone fiber, which also indicates the better distribution of internal forces in these slabs. However, the slab reinforced only with low-ductility reinforcement failed catastrophically with a single minor crack and without appreciable deflection.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001846109
|
oai_dc
|
Introduction of sand marble wastes in the composition of mortar
|
Introduction of sand marble wastes in the composition of mortar
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H. Hebhoub(University of Skikda); M. Belachia(University of Skikda); R. Djebien(University of Skikda)"
] |
During the past years, the protection of the environnement has become a major concern out passing the state frontiers to reach a planetary dimension. Depository waste sites have become a serious problem in terms of their locations and costs. On the other hand, the construction industry has a leading place in terms of quantities of waste produced from the start to the end of each construction site, by the large amounts of raw materials used and their respective consequences on the environment. The recycling of quarry wastes products, of demolished concrete, bricks and large quantities of waste resulting from the transformation of marble blocks can provide ideal solutions and advantages for the preservation of the environment, to become a supplementary source of aggregates. The main purpose of this study is to show technically the possibility of recuperating the aggregates of marble wastes as a partial substitute or total in the mortars. The aggregates used in this study is a sand of marble wastes (excess loads of sand exposed to bad weather conditions) of the quarry derived from Fil-fila marble (Skikda, east of Algeria). To achieve this work, we have studied the effect of sand substitution of marble wastes in the mortar with rates of (25, 50, 75, 100%); comparing the results obtained with reference samples (0%), the properties when the samples are fresh, and the mechanical performances of mortars at solid state (loss and gain of weight, dimensional variations). The introduction of recycled sand in the mortars gives good results and can be used as granulates.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001846111
|
oai_dc
|
V-notched elements under mode II loading conditions
|
V-notched elements under mode II loading conditions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Alberto Sapora(Politecnico di Torino); Pietro Cornetti(Politecnico di Torino); Alberto Carpinteri(Politecnico di Torino)"
] |
We apply the Finite Fracture Mechanics criterion to address the problem of a V-notched structure subjected to mode II loading, i.e., we provide a way to determine the direction and the load at which a crack propagates from the notch tip and express the critical conditions in terms of the generalized stress intensity factor. Weight functions for V-notch emanated cracks available in the literature allow us to implement the fracture criterion proposed in an almost completely analytical manner: the determination of the critical load and the direction of crack growth is reduced to a stationary point problem. A comparison with experimental data presented in the Literature concludes the paper.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001846112
|
oai_dc
|
Wireless sensor network protocol comparison for bridge health assessment
|
Wireless sensor network protocol comparison for bridge health assessment
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gokhan Kilic(Izmir University of Economics)"
] |
In this paper two protocols of Wireless Sensor Networks (WSN) are examined through both a simulation and a case study. The simulation was performed with the optimized network (OPNET) simulator while comparing the performance of the Ad-Hoc on demand Distance Vector (AODV) and the Dynamic Source Routing (DSR) protocols. This is compared and shown with real-world measurement of deflection from eight wireless sensor nodes. The wireless sensor response results were compared with accelerometer sensors for validation purposes. It was found that although the computer simulation suggests the AODV protocol is more accurate, in the case study no distinct difference was found. However, it was shown that AODV is still more beneficial in the field as it has a longer battery life enabling longer surveying times. This is a significant finding as a large factor in determining the use of wireless network sensors as a method of assessing structural response has been their short battery life. Thus if protocols which enhance battery life,such as the AODV protocol, are employed it may be possible in the future to couple wireless networks with solar power extending their monitoring periods.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001845005
|
oai_dc
|
Comparison of shear lag in structural steel building with framed tube and braced tube
|
Comparison of shear lag in structural steel building with framed tube and braced tube
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Iman Mazinani(University of Malaya); Mohd Zamin Jumaat(University of Malaya); Z. Ismail(University of Malaya); Ong Zhi Chao(University of Malaya)"
] |
Under lateral loads Framed Tube (FT) system exhibits reduction of cantilever efficiency due to the effect of shear lag. Braced Tube (BT) represents a valuable solution to overcome shear lag problems by stiffening the exterior frame with diagonal braced members. This study investigates the effect of shear lag on BT and FT under wind load. Shear lag and top-level displacement results are compared with previous findings by researchers on FT and BT systems. The investigation of the effect of various configurations in BT on the reduction the shear lag is another objective of this study. The efficiency of each structure is evaluated using the linear response spectrum analysis to obtain shear lag. STADD Pro software is used to run the dynamic analysis of the models. Results show there is relatively less shear lag in all the BT configurations compared to the FT structural system. Moreover, the comparison of the obtained result with those derived by previous studies shows that shear lag is not proportional to lateral displacement. With respect to results, optimum BT configuration in term of lower shear lag caused by lateral loads is presented.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001845011
|
oai_dc
|
Seismicity and seismic hazard assessment for greater Tehran region using Gumbel first asymptotic distribution
|
Seismicity and seismic hazard assessment for greater Tehran region using Gumbel first asymptotic distribution
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Morteza Bastami(IIEES); Milad Kowsari(University of Kurdistan)"
] |
Considering the history of severe earthquakes and the presence of active faults in the greater Tehran region, the possibility of a destructive earthquake occurring is high and seismic hazard analysis is crucial. Gumbel distributions are commonly-used statistical distributions in earthquake engineering and seismology. Their main advantage is their basis on the largest earthquake magnitudes selected from an equal-time predefined set. In this study, the first asymptotic distribution of extremes is used to estimate seismicity parameters and peak ground acceleration (PGA). By assuming a Poisson distribution for the earthquakes, after estimation of seismicity parameters, the mean return period and the probable maximum magnitude within a given time interval are obtained. A maximum probable magnitude of 7.0 has a mean return period of 100 years in this region. For a return period of 475 years, the PGA in the greater Tehran region is estimated to be 0.39g to 0.42g, depending on local site conditions. This value is greater than that of the Iranian Code for Seismic Design of Buildings, indicating that a revision of the code is necessary.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001845012
|
oai_dc
|
FE modeling of inelastic behavior of reinforced high-strength concrete continuous beams
|
FE modeling of inelastic behavior of reinforced high-strength concrete continuous beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tiejiong Lou(University of Coimbra); Sergio M.R. Lopes(University of Coimbra); Adelino V. Lopes(University of Coimbra)"
] |
A finite element model for predicting the entire nonlinear behavior of reinforced high-strengthconcrete continuous beams is described. The model is based on the moment-curvature relations pre-generated through section analysis, and is formulated utilizing the Timoshenko beam theory. The validity of the model is verified with experimental results of a series of continuous high-strength concretebeam specimens. Some important aspects of behavior of the beams having different tensile reinforcement ratios are evaluated. In addition, a parametric study is carried out on continuous high-strength concrete beams with practical dimensions to examine the effect of tensile reinforcement on the degree of moment redistribution. The analysis shows that the tensile reinforcement in continuous high-strength concrete beamsaffects significantly the member behavior, namely, the flexural cracking stiffness, flexural ductility, neutral axis depth and redistribution of moments. It is also found that the relation between the tensile reinforcement ratios at critical negative and positive moment regions has great influence on the moment redistribution, while the importance of this factor is neglected in various codes.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001845015
|
oai_dc
|
Damage assessment of frame structure using quadratic time-frequency distributions
|
Damage assessment of frame structure using quadratic time-frequency distributions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sabyasachi Chandra(Dr. B.C. Roy Engineering College); S.V. Barai(Indian Institute of Technology Kharagpur)"
] |
This paper presents the processing of nonlinear features associated with a damage event by quadratic time-frequency distributions for damage identification in a frame structure. A time-frequency distribution is a function which distributes the total energy of a signal at a particular time and frequency point. As the occurrence of damage often gives rise to non-stationary, nonlinear structural behavior, simultaneous representation of the dynamic response in the time-frequency plane offers valuable insight fordamage detection. The applicability of the bilinear time-frequency distributions of the Cohen class is examined for the damage assessment of a frame structure from the simulated acceleration data. It is shown that the changes in instantaneous energy of the dynamic response could be a good damage indicator. Presence and location of damage can be identified using Choi-Williams distribution when damping is ignored. However, in the presence of damping the Page distribution is more effective and offers better readability for structural damage detection.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001845013
|
oai_dc
|
Horizontal stiffness solutions for unbonded fiber reinforced elastomeric bearings
|
Horizontal stiffness solutions for unbonded fiber reinforced elastomeric bearings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H. Toopchi-Nezhad(Razi University)"
] |
Fiber Reinforced Elastomeric Bearings (FREBs) are a relatively new type of laminated bearings that can be used as seismic/vibration isolators or bridge bearings. In an unbonded (U)-FREB, the bearing is placed between the top and bottom supports with no bonding or fastening provided at its contact surfaces. Under shear loads the top and bottom faces of a U-FREB roll off the contact supports and the bearing exhibits rollover deformation. As a result of rollover deformation, the horizontal response characteristics of U-FREBs are significantly different than conventional elastomeric bearings that are employed in bonded application. Current literature lacks an efficient analytical horizontal stiffness solution for this type of bearings. This paper presents two simplified analytical models for horizontal stiffness evaluation of U-FREBs. Both models assume that the resistance to shear loads is only provided by an effective region of the bearing that sustains significant shear strains. The presented models are different in the way they relate this effective region to the horizontal bearing displacements. In comparison with experimental results and finite element analyses, the analytical models that are presented in this paper are found to be sufficiently accurate to be used in the preliminary design of U-FREBs.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001845010
|
oai_dc
|
Design of LQR controller for active suspension system of Partially Filled Tank Cars
|
Design of LQR controller for active suspension system of Partially Filled Tank Cars
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Mahdi Feizi(Iran University of Science and Technology); Mohammad Ali Rezvani(Iran University of Science and Technology)"
] |
Increasing usage of tank cars and their intrinsic instability due to sloshing of contents have caused growing maintenance costs as well as more frequent hazards and defects like derailment and fatigue of bogies and axels. Therefore, varieties of passive solutions have been represented to improve dynamical parameters. In this task, assuming 22 degrees of freedom, dynamic analysis of partially filled tank car traveling on a curved track is investigated. In order to consider stochastic geometry of track; irregularities have been derived randomly by Mont Carlo method. More over the fluid tank model with 1 degree of freedom is also presented by equivalent mechanical approach in terms of pendulum. An active suspension system for described car is designed by using linear quadratic optimal control theory to decrease destructive effects of fluid sloshing. Eventually, the performance of the active suspension system has been compared with that of the passive one and a study is carried out on how active suspension may affect the dynamical parameters such as displacements and Nadal’s derailment index.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001845007
|
oai_dc
|
Safety analysis and design of full balanced hoist vertical shiplifts
|
Safety analysis and design of full balanced hoist vertical shiplifts
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lekang Liao(Chang Jiang Institute of Survey PIanning Design and Research)"
] |
The safety relating to leakage of water and pitch instability of ship chambers of the full balanced hoist vertical shiplifts has been the focus of adoption of the type of vertical shiplifts. This paper aims to remove the doubts through theoretical and engineering researches. The leakage and pitch stability of ship chambers of full balanced hoist vertical ship lifts are investigated on the basis of theoretical analysis and exploration of engineering measures. Regarding the issue of leakage of ship chambers, a mathematical model on leaking process is built and corresponding formula and coping measures are obtained which can be applied in control program of ship lifts by linking with monitoring. The concept of safety grade is put forward to seek the best technical and economic index and the corresponding technical measures are for different grades of ship lift is suggested. For the issue of pitch instability, a methodology of combining theoretical deduction and summary of achievements of design and operation of the type of the full balanced hoist shiplifts is adopted, and the formula for design about pitch stability of ship chambers is derived.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001845002
|
oai_dc
|
Influence of some key factors on material damping of steel beams
|
Influence of some key factors on material damping of steel beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yuanfeng Wang(Beijing Jiaotong University); Yuhua Pan(Beijing Jiaotong University); Jie Wen(Beijing Jiaotong University); Li Su(Beijing Jiaotong University); Shengqi Mei(Beijing Jiaotong University)"
] |
Material damping affects the dynamic behaviors of engineering structures considerably, but up to till now little research is maintained on influence factors of material damping. Based on the damping-stress function of steel, the material damping of steel beams is obtained by calculating the stress distribution of the beams with an analytical method. Some key influence factors of the material damping, such as boundary condition, amplitude and frequency of excitation, load position as well as the cross-sectional dimension of a steel beam are analyzed respectively. The calculated results show that even in elastic scope, material damping does not remain constant but varies with these influence factors. Although boundary condition affects material damping to some extent, such influence can be neglected when the maximum stress amplitude of the beam is less than the fatigue limit of steel. Exciting frequency, load position and cross-section dimension have great effects on the material damping of the beam which maintain the similar changing trend under different boundary conditions respectively.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001802934
|
oai_dc
|
Limit states of RC structures with first floor irregularities
|
Limit states of RC structures with first floor irregularities
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Maria J. Favvata(Democritus University of Thrace); Maria C. Naoum(Democritus University of Thrace); Chris G. Karayannis(Democritus University of Thrace)"
] |
The seismic performance of reinforced concrete (RC) frame structures with irregularities leading to soft first floor is studied using capacity assessment procedures. The soft first story effect is investigated for the cases: (i) slab-column connections without beams at the first floor, (ii) tall first story height and (iii) pilotis type building (open ground story). The effects of the first floor irregularity on the RC frame structure performance stages at global and local level (limit states) are investigated. Assessment based on the Capacity Spectrum Method (ATC-40) and on the Coefficient Method (FEMA 356) is also examined. Results in terms of failure modes, capacity curves, interstory drifts, ductility requirements and infills behaviour are presented. From the results it can be deduced that the global capacity of the structures is decreased due to the considered first floor morphology irregularities in comparison to the capacities of the regular structure. An increase of the demands for interstory drift is observed at the first floor level due to the considered irregularities while the open ground floor structure (pilotis type) led to even higher values of interstory drift demands at the first story. In the cases of tall first story and slab-column connections without beams softstory mechanisms have also been observed at the first floor. Rotational criteria (EC8-part3) showed that the structure with slab-column connections without beams exhibited the most critical response.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001802941
|
oai_dc
|
Evaluation of rigid-end offset effect on seismic behavior of a structure subjected to Van earthquake
|
Evaluation of rigid-end offset effect on seismic behavior of a structure subjected to Van earthquake
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Serkan Bekiroğlu(Yıldız Technical University); Abdurrahman Şahin(Yıldız Technical University); Barış Sevim(Yıldız Technical University); Yusuf Ayvaz(Yıldız Technical University)"
] |
Numerical damage assessment of Van train station building consisting of three RC blocks due to 2011 Van Earthquakes by nonlinear dynamic analysis is presented. The structural model is created with rigid-end offsets and plastic hinges for nonlinear analysis. Rigid-end offsets are considered for connection areas and proposed for wall-supported elements. In wall-supported elements, walls take place in a limited part of the columns. Nonlinear dynamic analysis of the building with and without rigid-end offsets is performed by using real earthquake records and results are compared. The results show that rigid-end offsets have significant effects on the seismic behavior of the structures.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001802938
|
oai_dc
|
Flexural behaviour of reinforced low-strength concrete beams strengthened with CFRP plates
|
Flexural behaviour of reinforced low-strength concrete beams strengthened with CFRP plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohcene Boukhezar(University of Constantine 1); Mohamed Laid Samai(University of Constantine 1); Habib Abdelhak Mesbah(University of Rennes 1); Hacène Houari(University of Constantine 1)"
] |
This paper summarises the results of an experimental study to investigate the flexural behaviour of reinforced concrete beams strengthened using carbon-fibre reinforced polymer (CFRP) laminate in fourpoint bending. The experimental parameters included are the reinforcing bar ratio ps and preload level. Four bar ratios were selected (ps = 0.13 to 0.86%), representing the section of two longitudinal tensile reinforcements, with diameters of 8, 14, 16, and 20 mm in order to reveal the effect of bar ratio on failure load and failure mode. Eight beams that could be considered "full-scale" in size, measuring 200 mm in width, 400 mm in total height and 2300 mm in length, were tested. Three beams were selected with different bar ratios (p1, p2, p3), and considered as control specimens (without ), while three other beams identical to the control beams with the same CFRP laminates ratio and a seventh beam with pmin (the lowest bar ratio) were also used. In the second part of the study, two beams with the bar ratio p2 were preloaded at two levels, 50 and 100% of their ultimate loads, and then repaired. This experimental investigation was consolidated using an analytical model. The experimental and analytical results indicate that the flexional capacity and stiffness of strengthened and repaired beams using CFRP laminate were increased compared to those of control beams, and the behaviour of repaired beams was nearly similar to the undamaged and strengthened beams; unlike the ductility of strengthened beams, which was greatly reduced compared to the control.
|
토목공학
| null |
kci_detailed_000071.xml
|
|||
ART001802943
|
oai_dc
|
Study of an innovative two-stage control system: Chevron knee bracing & shear panel in series connection
|
Study of an innovative two-stage control system: Chevron knee bracing & shear panel in series connection
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Seyed Mehdi Zahrai(The University of Tehran); Amir Koorosh Vosooq(Tafresh University)"
] |
This paper describes analytical investigation into a new dual function system including a couple of shear links which are connected in series using chevron bracing capable to correlate its performance with magnitude of earthquakes. In this proposed system, called Chevron Knee-Vertical Link Beam braced system (CK-VLB), the inherent hysteretic damping of vertical link beam placed above chevron bracing is exclusively utilized to dissipate the energy of moderate earthquakes through web plastic shear distortion while the rest of the structural elements are in elastic range. Under strong earthquakes, plastic deformation of VLB will be halted via restraining it by Stopper Device (SD) and further imposed displacement subsequently causes yielding of the knee elements located at the bottom of chevron bracing to significantly increase the energy dissipation capacity level. In this paper first by studying the knee yielding mode, a suitable shape and angle for diagonal-knee bracing is proposed. Then finite elements models are developed. Monotonic and cyclic analyses have been conducted to compare dissipation capacities on three individual models of passive systems (CK-VLB, knee braced system and SPS system) by General-purpose finite element program ABAQUS in which a bilinear kinematic hardening model is incorporated to trace the material nonlinearity. Also quasi-static cyclic loading based on the guidelines presented in ATC-24 has been imposed to different models of CK-VLB with changing of vertical link beam section in order to find prime effectiveness on structural frames. Results show that CK-VLB system exhibits stable behavior and is capable of dissipating a significant amount of energy in two separate levels of lateral forces due to different probable earthquakes.
|
토목공학
| null |
kci_detailed_000071.xml
|
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