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ART001957446
|
oai_dc
|
Rock bridge fracture model and stability analysis of surrounding rock in underground cavern group
|
Rock bridge fracture model and stability analysis of surrounding rock in underground cavern group
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Song Yu(Chinese Academy of Sciences); Wei-shen Zhu(Chinese Academy of Sciences); Wei-min Yang(Shandong University); Dun-fu Zhang(Shandong University); Qing-song Ma(Shandong University)"
] |
Many hydropower stations in southwest China are located in regions of brittle rock mass with high geo-stresses. Under these conditions deep fractured zones often occur in the sidewalls of the underground caverns of a power station. The theory and methods of fracture and damage mechanics are therefore adopted to study the phenomena. First a flexibility matrix is developed to describe initial geometric imperfections of a jointed rock mass. This model takes into account the area and orientation of the fracturedsurfaces of multiple joint sets, as well as spacing and density of joints. Using the assumption of the equivalent strain principle, a damage constitutive model is established based on the brittle fracture criterion. In addition the theory of fracture mechanics is applied to analyze the occurrence of secondary cracks duringa cavern excavation. The failure criterion, for rock bridge coalescence and the damage evolution equation, has been derived and a new sub-program integrated into the FLAC-3D software. The model has then beenapplied to the stability analysis of an underground cavern group of a hydropower station in Sichuan province, China. The results of this method are compared with those obtained by using a conventional elasto-plastic model and splitting depth calculated by the splitting failure criterion proposed in a previous study. The results are also compared with the depth of the relaxation and fracture zone in the surrounding rock measured by field monitoring. The distribution of the splitting zone obtained both by the proposed model and by the field monitoring measurements are consistent to the validity of the theory developed herein.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001957444
|
oai_dc
|
Analysis of thermally induced vibration of cable-beam structures
|
Analysis of thermally induced vibration of cable-beam structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Han-Qing Deng(Xidian University); Tuan-Jie Li(Xidian University); Bi-Jie Xue(Xidian University); Zuo-Wei Wang(Xidian University)"
] |
Cable-beam structures characterized by variable stiffness nonlinearities are widely found in various structural engineering applications, for example in space deployable structures. Space deployablestructures in orbit experience both high temperature caused by sun’s radiation and low temperature by Earth’s umbral shadow. The space temperature difference is above 300K at the moment of exiting or entering Earth’s umbral shadow, which results in structural thermally induced vibration. To understand the thermally induced oscillations, the analytical expression of Boley parameter of cable-beam structures is firstly deduced. Then, the thermally induced vibration of cable-beam structures is analyzed using finite element method to verify the effectiveness of Boley parameter. Finally, by analyzing the obtained numerical results and the corresponding Boley parameters, it can be concluded that the derived expression of Boley parameter is valid to evaluate the occurrence conditions of thermally induced vibration of cable-beam structures and the key parameters influencing structural thermal flutter are the cable stiffness and thickness of beams.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001957445
|
oai_dc
|
Numerical simulation of reinforced concrete slabs under missile impact
|
Numerical simulation of reinforced concrete slabs under missile impact
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Duc-Kien Thai(Sejong University); 김승억(세종대학교)"
] |
This paper presents a numerical analysis of reinforced concrete slabs under missile impactloading. The specimen used for the numerical simulation was tested by the Technical Research Center ofFinland. LS-DYNA, commercial available software, is used to analyze the model. The structuralcomponents of the reinforced concrete slab, missile, and their contacts are fully modeled. Included in theanalysis is material nonlinearity considering damage and failure. The results of analysis are then verifiedwith other research results. Parametric studies with different longitudinal rebar ratios, shear bar ratios, andconcrete strengths are conducted to investigate their influences on the punching behavior of slabs under theimpact of a missile. Finally, efficient designs are recommended.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001875425
|
oai_dc
|
Crack propagation and deviation in bi-materials under thermo-mechanical loading
|
Crack propagation and deviation in bi-materials under thermo-mechanical loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mourad Chama(University Djillali Liabes of Sidi Bel Abbes); Benali Boutabout(University Djillali Liabes of Sidi Bel Abbes); Abdelkader Lousdad(University Djillali Liabes of Sidi Bel Abbes); Wafa Bensmain(University Djillali Liabes of Sidi Bel Abbes); Bel Abbes Bachir Bouiadjra(University Djillali Liabes of Sidi Bel Abbes)"
] |
This paper presents a finite element based numerical model to solve two dimensional bi-material problems. A bi-material beam consisting of two phase materials ceramic and metal is modelled by finite element method. The beam is subjected simultaneously to mechanical and thermal loadings. The mainobjective of this study is the analysis of crack deviation located in the brittle material near the interface. The effect of temperature gradient, the residual stresses and applied loads on crack initiation, propagation and deviation are examined and highlighted.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001875427
|
oai_dc
|
Performance of sandwich structure strengthened by pyramid cover under blast effect
|
Performance of sandwich structure strengthened by pyramid cover under blast effect
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sherif A. Mazek(Military Technical College)"
] |
The number of explosive attacks on civilian structures has recently increased. Protection of structure subjected to blast load remains quite sophisticated to predict. The use of the pyramid cover system (PCS) to strengthen sandwich structures against a blast terror has great interests from engineering experts instructural retrofitting. The sandwich steel structure performance under the impact of blast wave effect is highlighted. A 3-D numerical model is proposed to study the PCS layer to strengthen sandwich steel structures using finite element analysis (FEA). Hexagonal core sandwich (XCS) steel panels are used to study structural retrofitting using the PCS layer. Field blast test is conducted. The study presents a comparison between the results obtained by both the field blast test and the FEA to validate the accuracy of the 3-D finite element model. The effects are expressed in terms of displacement-time history of thesandwich steel panels and pressure-time history effect on the sandwich steel panels as the explosive wave propagates. The results obtained by the field blast test have a good agreement with those obtained by the numerical model. The PCS layer improves the sandwich steel panel performance under impact of detonating different TNT explosive charges.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001875428
|
oai_dc
|
Nonlinear in-plane free oscillations of suspended cable investigated by homotopy analysis method
|
Nonlinear in-plane free oscillations of suspended cable investigated by homotopy analysis method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yaobing Zhao(Hunan University); Ceshi Sun(Hunan University); Zhiqian Wang(Hunan University); Jian Peng(Hunan University of Science and Technology)"
] |
An analytical solution for the nonlinear in-plane free oscillations of the suspended cable which contains the quadratic and cubic nonlinearities is investigated via the homotopy analysis method (HAM). Different from the existing analytical technique, the HAM is indeed independent of the small parameter assumption in the nonlinear vibration equation. The nonlinear equation is established by using the extended Hamilton's principle, which takes into account the effects of the geometric nonlinearity and quasi-static stretching. A non-zero equilibrium position term is introduced due to the quadratic nonlinearity in order to guarantee the rule of the solution expression. Therefore, the mth-order analytic solutions of the corresponding equation are explicitly obtained via the HAM. Numerical results show that the approximate solutions obtained by using the HAM are in good agreement with the numerical integrations (i.e., Runge-Kutta method). Moreover, the HAM provides a simple way to adjust and control the convergent regions of the series solutions by means of an auxiliary parameter. Finally, the effects of initial conditions on the linear and nonlinear frequency ratio are investigated.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001875430
|
oai_dc
|
3-D fracture analysis of cracked aluminum plates repaired with single and double composite patches using XFEM
|
3-D fracture analysis of cracked aluminum plates repaired with single and double composite patches using XFEM
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Majid Jamal-Omidi(Space Research Institute); Mehdi Falah(Space Research Institute); Davood Taherifar(Space Research Institute)"
] |
Bonded composite-patch repair has been widely used to restore or extend the service life of damaged structures due to its effectiveness as a mechanical repair technique. In this paper using extended finite element method (XFEM), three-dimensional crack models are developed to examine the fracture behavior of centrally cracked aluminum plates repaired with single and double sided composite patches. Stress intensity factor (SIF) at the crack tip is used as the fracture criterion. In this regard, the effects of the crack lengths, patch materials, orientation of plies, adhesive and patch thickness are examined to estimate the SIF of the repaired plate and the repair performance. The obtained results show that composite patches have significant effect on reduction of the SIF at the crack tip. It is also proved that using double symmetric repair, in comparison to single one, reduces considerably SIF at the crack tip. Hence, the residual strength can be improved significantly as well as fatigue life of the structure. Investigation of ply orientation effects shows SIF increase as the ply orientation is changed from 0° (perpendicular to the advancing crack) to 90° (parallel to the crack line). However, the effectiveness of the ply orientation depends on the loading direction and the crack direction.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001875432
|
oai_dc
|
An approach to improve thickness distribution and corner filling of copper tubes during hydro-forming processes
|
An approach to improve thickness distribution and corner filling of copper tubes during hydro-forming processes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hossein GhorbaniMenghari(Isfahan University of Technology); Hamed Ziaei Poor(Isfahan University of Technology); Mahmoud Farzin(Isfahan University of Technology); Ricardo J. Alves De Sousa(University of Aveiro)"
] |
In hydroforming, the general technique employed to overcome the problem of die corner filling consist in increasing the maximum fluid pressure during the forming process. This technique, in other hand, leads to other difficulties such as thinning and rupturing of the final work piece. In this paper, a new technique has been suggested in order to produce a part with complete filled corners. In this approach, two moveable bushes have been used. So, the workpiece moves driven by both bushes simultaneously. In the first stage, system pressure increases until a maximum of 15 MPa, providing aninitial tube bulge. The results showed that the pressure in this stage have to be limited to 17 MPa to avoid fracture. In a second stage, bushes are moved keeping the constant initial pressure. The punches act simultaneously at the die extremities. Results show that the friction between part and die decreases during the forming process significantly. Also, by using this technique it is possible to produce a part with reasonable uniform thickness distribution. Other outcomes of applying this method are the lower pressures required to manufacture a workpiece with complete filled corners with no wrinkling.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001875424
|
oai_dc
|
Structural evaluation of Aspendos (Belkıs) Masonry Bridge
|
Structural evaluation of Aspendos (Belkıs) Masonry Bridge
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Temel Türker(Karadeniz Technical University)"
] |
In this study, the structural performance of a seven span masonry arch bridge was evaluated. Investigations were performed on Aspendos (Belkıs) Masonry Arch Bridge which was located on road of Aspendos Acropolis City in Antalya, Turkey. The old bridge was constructed in the early of fourth century AD, but it was exposed to the earthquakes in this region and the overloading by the river water. The old bridge was severely damaged and collapsed by probably an earthquake many years ago and a new bridge was then reconstructed on the remains of this old bridge by Seljuk in the 13th century. The bridge has also been affected from overflowing especially in the spring of each year, so some protective measures should be taken for this monumental bridge. Therefore, the structural performance under these loading has to be known. For this purpose, an initial finite element model was developed for the bridge and it was calibrated according to ambient vibration test results. After that, it was analyzed for different load cases such as dead, live, earthquake and overflow. Three load combinations were taken into account by deriving from these load cases. The displacements and the stresses for these combination cases were attained and compared with each other. The structural performance of Aspendos Masonry Arch Bridge was determined by considering the demand-capacity ratio for the tensile stress of the mortar used in Aspendos Masonry Arch Bridge. After these investigations, some concluding remarks and offers were presented at the end of this study.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001875426
|
oai_dc
|
Failure analysis of steel column-RC base connections under lateral cyclic loading
|
Failure analysis of steel column-RC base connections under lateral cyclic loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Serhat Demir(Karadeniz Technical University); Metin Husem(Karadeniz Technical University); Selim Pul(Karadeniz Technical University)"
] |
One of the most important structural components of steel structures is the column-base connections which are obliged to transfer horizontal and vertical loads safely to the reinforced concrete (RC) or concrete base. The column-base connections of steel or composite steel structures can be organized both moment resistant and non-moment resistant leading to different connection styles. Some of these connection styles are ordinary bolded systems, socket systems and embedded systems. The structures are frequently exposed to cycling lateral loading effects causing fatal damages on connections like columns-to-beams or columns-to-base. In this paper, connection of steel column with RC base was investigated analytically andexperimentally. In the experiments, bolded connections, socket and embedded connection systems are taken into consideration by applying cyclic lateral loads. Performance curves for each connection were obtained according to experimental and analytical studies conducted and inelastic behavior of connections was evaluated accordingly. The cyclic lateral performance of the connection style of embedding the steel column into the reinforced concrete base and strengthening of steel column in upper level of base connection wasfound to be higher and effective than other connection systems. Also, all relevant test results were discussed.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001875431
|
oai_dc
|
Seismic vulnerability assessment of masonry facade walls: development, application and validation of a new scoring method
|
Seismic vulnerability assessment of masonry facade walls: development, application and validation of a new scoring method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tiago M. Ferreira(University of Aveiro); Romeu Vicente(University of Aveiro); Humberto Varum(University of Aveiro)"
] |
This paper approaches the issue of seismic vulnerability assessment strategies for facade walls of traditional masonry buildings through the development of a methodology and its subsequent application to over 600 building facades from the old building stock of the historic city centre of Coimbra. Using the post-earthquake damage assessment of masonry buildings in L'Aquila, Italy, an analytical function was developed and calibrated to estimate the mean damage grade for masonry facade walls. Having defined the vulnerability function for facade walls, damage scenarios were calculated and subsequently used in the development of an emergency planning tool and in the elaboration of an access route proposal for the case study of the historic city centre of Coimbra. Finally, the methodology was pre-validated through the comparison of a set of results obtained from its application and also resourcing to a widely accepted mechanical method on the description of the out-of-plane behaviour of facade walls.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001875429
|
oai_dc
|
Loading capacity evaluation of composite box girder with corrugated webs and steel tube slab
|
Loading capacity evaluation of composite box girder with corrugated webs and steel tube slab
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jun He(Changsha University of Science & Technology); Yuqing Liu(Tongji University); Xiaoqing Xu(Tongji University); Laibin Li(Xingtai Road & Bridge Construction Corporation)"
] |
This paper presents a type of composite box girder with corrugated webs and concrete filled steel tube slab to overcome cracking on the web and reduce self-weight. Utilizing corrugated steel web improves the efficiency of prestressing introduced into the top and bottom slabs due to the accordion effect. In order to understand the loading capacity of such new composite structure, experimental and numerical analyses were conducted. A full-scale model was loaded monotonically to investigate the deflection, straindistribution, loading capacity and stiffness during the whole process. The experimental results show that test specimen has enough loading capacity and ductility. Based on experimental works, a finite element (FE) model was established. The load-displacement curves and stress distribution predicted by FE model agreewell with that obtained from experiments, which demonstrates the accuracy of proposed FE model.
Moreover, simplified theoretical analysis was conducted depending on the assumptions which were confirmed by the experimental and numerical results. The simplified analysis results are identical with the tested and numerical results, which indicate that simplified analytical model can be used to predict the loading capacity of such composite girder accurately. All the findings of present study may provide reference for the application of such structure in bridge construction.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001990562
|
oai_dc
|
Nonlocal integral elasticity analysis of beam bending by using finite element method
|
Nonlocal integral elasticity analysis of beam bending by using finite element method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Taghizadeh(Amirkabir University of Technology); H.R. Ovesy(Amirkabir University of Technology); S.A.M. Ghannadpour(Shahid Beheshti University)"
] |
In this study, a 2-D finite element formulation in the frame of nonlocal integral elasticity is presented. Subsequently, the bending problem of a nanobeam under different types of loadings and boundary conditions is solved based on classical beam theory and also 3-D elasticity theory using nonlocal finite elements (NL-FEM). The obtained results are compared with the analytical and numerical results of nonlocal differential elasticity. It is concluded that the classical beam theory and the nonlocal differential elasticity can separately lead to significant errors for the problem under consideration as distinct from 3-D elasticity and nonlocal integral elasticity respectively.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001990558
|
oai_dc
|
A mechanical response of functionally graded nanoscale beam: an assessment of a refined nonlocal shear deformation theory beam theory
|
A mechanical response of functionally graded nanoscale beam: an assessment of a refined nonlocal shear deformation theory beam theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Amine Zemri(University of Sidi Bel Abbes); Mohammed Sid Ahmed Houari(Université de Mascara); Abdelmoumen Anis Bousahla(University of Sidi Bel Abbes); Abdelouahed Tounsi(University of Sidi Bel Abbes)"
] |
This paper presents a nonlocal shear deformation beam theory for bending, buckling, and vibration of functionally graded (FG) nanobeams using the nonlocal differential constitutive relations of Eringen. The developed theory account for higher-order variation of transverse shear strain through the depth of the nanobeam, and satisfy the stress-free boundary conditions on the top and bottom surfaces of the nanobeam. A shear correction factor, therefore, is not required. In addition, this nonlocal nanobeam model incorporates the length scale parameter which can capture the small scale effect and it has strong similarities with Euler–Bernoulli beam model in some aspects such as equations of motion, boundary conditions, and stress resultant expressions. The material properties of the FG nanobeam are assumed to vary in the thickness direction. The equations of motion are derived from Hamilton’s principle. Analytical solutions are presented for a simply supported FG nanobeam, and the obtained results compare well with those predicted by the nonlocal Timoshenko beam theory.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001990554
|
oai_dc
|
Analytical solution of a contact problem and comparison with the results from FEM
|
Analytical solution of a contact problem and comparison with the results from FEM
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Erdal Öner(Bayburt University); Murat Yaylacı(Recep Tayyip Erdoğan University); Ahmet Birinci(Karadeniz Technical University)"
] |
This paper presents a comparative study of analytical method and finite element method (FEM) for analysis of a continuous contact problem. The problem consists of two elastic layers loaded by means of a rigid circular punch and resting on semi-infinite plane. It is assumed that all surfaces are frictionless and only compressive normal tractions can be transmitted through the contact areas. Firstly, analytical solution of the problem is obtained by using theory of elasticity and integral transform techniques. Then, finite element model of the problem is constituted using ANSYS software and the two dimensional analysis of the problem is carried out. The contact stresses under rigid circular punch, the contact areas, normal stresses along the axis of symmetry are obtained for both solutions. The results show that contact stresses and the normal stresses obtained from finite element method (FEM) provide boundary conditions of the problem as well as analytical results. Also, the contact areas obtained from finite element method are very close to results obtained from analytical method; disagree by 0.03-1.61%. Finally, it can be said that there is a good agreement between two methods.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001990564
|
oai_dc
|
Direct kinematic method for exactly constructing influence lines of forces of statically indeterminate structures
|
Direct kinematic method for exactly constructing influence lines of forces of statically indeterminate structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Dixiong Yang(Dalian University of Technology); Guohai Chen(Dalian University of Technology); Zongliang Du(Dalian University of Technology)"
] |
Constructing the influence lines of forces of statically indeterminate structures is a traditional issue in structural engineering and mechanics. However, the existing kinematic method for establishing these force influence lines is an indirect or mixed approach by combining the force method with the theorem of reciprocal displacements, which is yet inconsistent with the kinematic method for statically determinate structure. This paper proposes the direct kinematic method in conjunction with the load-displacement differential relation for exactly constructing influence lines of reaction and internal forces of indeterminate structures. Firstly, through applying the principle of virtual displacement, the formula for influence lines of reaction and internal forces of indeterminate structure via direct kinematic method is derived based on the released structure. Then, a computational approach with a clear concept and unified procedure as well as wide applicability based on the load-displacement differential relation of beam is suggested to achieve conveniently the closed-form expression of force influence lines, and exactly draw them. Finally, three representative examples for constructing force influence lines of statically indeterminate beams and frame illustrate the superiority of the proposed method.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001990559
|
oai_dc
|
Performance of rotational mode based indices in identification of added mass in beams
|
Performance of rotational mode based indices in identification of added mass in beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Prakash Rajendran(Indian Institute of Technology Madras); Sivakumar M Srinivasan(Indian Institute of Technology Madras)"
] |
This study investigates the identification of added mass and its location in the glass fiber reinforced polymer (GFRP) beam structures. The main emphasis of this paper is to ascertain the importance of inclusion of rotational degrees of freedom (dofs) in the introduction of added mass or damage identification. Two identification indices that include the rotational dofs have been introduced in this paper: the modal force index (MFI) and the modal rotational curvature index (MRCI). The MFI amplifies damage signature using undamaged numerical stiffness matrix which is related to changes in the altered mode shapes from the original mode shapes. The MRCI is obtained by using a higher derivative of rotational mode shapes. Experimental and numerical results are compared with the existing methods leading to a conclusion that the contributions of the rotational modes play a key role in the identification of added mass. The authors believe that the similar results are likely in the case of damage identification also.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001990565
|
oai_dc
|
Evaluation of energy response of space steel frames subjected to seismic loads
|
Evaluation of energy response of space steel frames subjected to seismic loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kadir Ozakgul(Istanbul Technical University)"
] |
In this paper, seismic energy response of inelastic steel structures under earthquake excitations is investigated. For this purpose, a numerical procedure based on nonlinear dynamic analysis is developed by considering material, geometric and connection nonlinearities. Material nonlinearity is modeled by the inversion of Ramberg-Osgood equation. Nonlinearity caused by the interaction between the axial force and bending moment is also defined considering stability functions, while the geometric nonlinearity caused by axial forces is described using geometric stiffness matrix. Cyclic behaviour of steel connections is taken into account by employing independent hardening model. Dynamic equation of motion is solved by Newmark's constant acceleration method in the time history domain. Energy response analysis of space frames is performed by using this proposed numerical method. Finally, for the first time, the distribution of the different energy types versus time at the duration of the earthquake ground motion is obtained where in addition error analysis for the numerical solutions is carried out and plotted depending on the relative error calculated as a function of energy balance versus time.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001990560
|
oai_dc
|
Critical buckling load optimization of the axially graded layered uniform columns
|
Critical buckling load optimization of the axially graded layered uniform columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Veysel Alkan(Pamukkale University)"
] |
This study presents critical buckling load optimization of the axially graded layered uniform columns. In the first place, characteristic equations for the critical buckling loads for all boundary conditions are obtained using the transfer matrix method. Then, for each case, square of this equation is taken as a fitness function together with constraints. Due to explicitly unavailable objective function for the critical buckling loads as a function of segment length and volume fraction of the materials, especially for the column structures with higher segment numbers, initially, prescribed value is assumed for it and then the design variables satisfying constraints are searched using Differential Evolution (DE) optimization method coupled with eigen-value routine. For constraint handling, Exterior Penalty Function formulation is adapted to the optimization cycle. Different boundary conditions are considered. The results reveal that maximum increments in the critical buckling loads are attained about 20% for cantilevered and pinned-pinned end conditions and 18% for clamped-clamped case. Finally, the strongest column structure configurations will be determined. The scientific and statistical results confirmed efficiency, reliability and robustness of the Differential Evolution optimization method and it can be used in the similar problems which especially include transcendental functions.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001990561
|
oai_dc
|
Prediction of engineering demand parameters for RC wall structures
|
Prediction of engineering demand parameters for RC wall structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Florin Pavel(Technical University of Civil Engineering Bucharest); Andrei Pricopie(Technical University of Civil Engineering Bucharest)"
] |
This study evaluates prediction models for three EDPs (engineering demand parameters) using data from three symmetrical structures with RC walls designed according to the currently enforced Romanian seismic design code P100-1/2013. The three analyzed EDPs are: the maximum interstorey drift, the maximum top displacement and the maximum shear force at the base of the RC walls. The strong ground motions used in this study consist of three pairs of recordings from the Vrancea intermediate-depth earthquakes of 1977, 1986 and 1990, as well as two other pairs of recordings from significant earthquakes in Turkey and Greece (Erzincan and Aigion). The five pairs of recordings are rotated in a clockwise direction and the values of the EDPs are recorded. Finally, the relation between various IMs (intensity measures) of the strong ground motion records and the EDPs is studied and two prediction models for EDPs are also evaluated using the analysis of residuals.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001990563
|
oai_dc
|
Dynamic response of a Timoshenko beam to a continuous distributed moving load
|
Dynamic response of a Timoshenko beam to a continuous distributed moving load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Olga Szyłko-Bigus(Wrocław University of Technology); Paweł Śniady(Wrocław University of Environmental and Life Science)"
] |
In the paper we study dynamic response of a finite, simply supported Timoshenko beam subject to a moving continuously distributed forces. Three problems have been considered. The dynamic response of the Timoshenko beam under a uniform distributed load moving with a constant velocity v has been considered as the first problem. Obtained solutions allow to find the response of the beam under the interval of the finite length a uniformly distributed moving load. Part of the solutions are presented in a closed form instead of an infinite series. As the second problem the steady-state vibrations of the beam under uniformly distributed mass m1 moving with the constant velocity has been considered. The vibrations of the beam caused by the interval of the finite length randomly distributed load moving with constant velocity is considered as the last problem. It is assumed that load process is space-time stationary stochastic process.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001990555
|
oai_dc
|
Forced vibration of surface foundation on multi-layered half space
|
Forced vibration of surface foundation on multi-layered half space
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lin Chen(RWTH Aachen University)"
] |
A numerical approach is presented for the analysis of the forced vibration of a rigid surface foundation with arbitrary shape. In the analysis, the foundation is discretized into a number of sub squareelements.
The dynamic response within each sub-element is described by the Green‟s function, which is obtained by the Fourier-Bessel transform and Precise Integration Method (PIM). Incorporating the displacement boundary condition and force equilibrium of the foundation, it obtains a system of linear algebraic equation in terms of the contact forces within each sub-element. Solving the equation leads to the desired dynamic impedance functions of the foundation. Numerical results are obtained for foundation not only with simple geometrical configurations, such as rectangular and circular foundation, but also the case of irregularly shaped foundation. Several comparisons between the proposed approach and other methods are made. Very good agreement is reached. Also, parametric studies are carried out on the dynamic response of foundation. Addressed in this study are the effects of Poisson‟s ratio, material damping and contact condition of soil-foundation interface. Several conclusions are drawn the significance of the factors.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001990556
|
oai_dc
|
Analytical solution for axisymmetric buckling of joined conical shells under axial compression
|
Analytical solution for axisymmetric buckling of joined conical shells under axial compression
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.A. Kouchakzadeh(Sharif University of Technology); M. Shakouri(Sharif University of Technology)"
] |
In this study, the authors present an analytical approach to find the axisymmetric buckling load of two joined isotropic conical shells under axial compression. The problem of two joined conical shells may be considered as the generalized form of joined cylindrical and conical shells with constant or stepped thicknesses. Thickness of each cone is constant; however it may be different from the thickness of the other cone. The boundary conditions are assumed to be simply supported with rigid rings. The governing equations for the conical shells are obtained and solved with an analytical approach. A simple closed-form expression is obtained for the buckling load of two joined truncated conical shells. Results are compared and validated with the numerical results of finite element method. The variation of buckling load with changes in the thickness and semi-vertex angles of the two cones is studied. Finally, application of the results in practical design and range of engineering validity are investigated.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001990557
|
oai_dc
|
The comparative analysis of optimal designed web expanded beams via improved harmony search method
|
The comparative analysis of optimal designed web expanded beams via improved harmony search method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ferhat Erdal(Akdeniz University)"
] |
This study aims at comparing the optimum design of two common types open web expanded beams: with hexagonal openings, also called castellated beams and beams with circular openings referred to as cellular beams. The minimum weights of both beams are taken as the objective functions while the design constraints are respectively implemented from The Steel Construction Institute Publication Numbers 5 and 100. The design methods adopted in these publications are consistent with BS5950 parts. The formulation of the design problem considering the limitations of the above mentioned turns out to be a discrete programming problem. Improved harmony search algorithm is suggested to compare the optimum design of mentioned web-expanded beams to analysis the performance of both beams. The design algorithms based on the technique select the optimum Universal Beam sections, dimensional properties of hexagonal and circular holes and total number of openings along the beam as design variables.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002013143
|
oai_dc
|
Buckling analysis of filament wound composite cylindrical shell for considering the filament undulation and crossover
|
Buckling analysis of filament wound composite cylindrical shell for considering the filament undulation and crossover
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhangxin Guo(Taiyuan University of Technology); Xiaoping Han(Northwestern Polytechnical University); Meiqing Guo(Taiyuan University of Technology); Zhijun Han(Taiyuan University of Technology)"
] |
The buckling equations of filament wound composite cylindrical shell are established. The coefficients Kij and Lij of the buckling equations are determined by solving the equations. The geometric analysis and the effective stiffness calculation for the fiber crossover and undulation region are respectively accomplished. Using the effective stiffness of the undulation region, the specific formulas of the coefficients Kij and Lij of the buckling equations are determined. Numerical examples of the buckling critical loads have been performed for the different winding angles and stacking sequences cylindrical shell designs. It can be concluded that the fiber undulation results in the less effect on the buckling critical loads Pcr. Pcr increases with the thickness-radius ratio. The effect on Pcr due to the fiber undulation is more obvious with the thickness-radius ratio. Pcr decreases with the length-radius ratio. The effect on Pcr due to the fiber undulation can be neglected when the ratio is large.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002013137
|
oai_dc
|
Optimum design of steel frames with semi-rigid connections and composite beams
|
Optimum design of steel frames with semi-rigid connections and composite beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Musa Artar(Bayburt University); Ayşe T. Daloğlu(Karadeniz Technical University)"
] |
In this paper, an optimization process using Genetic Algorithm (GA) that mimics biological processes is presented for optimum design of planar frames with semi-rigid connections by selecting suitable standard sections from a specified list taken from American Institute of Steel Construction (AISC). The stress constraints as indicated in AISC-LRFD (American Institute of Steel Construction - Load and Resistance Factor Design), maximum lateral displacement constraints and geometric constraints are considered for optimum design. Two different planar frames with semi-rigid connections taken from the literature are carried out first without considering concrete slab effects in finite element analyses and the results are compared with the ones available in literature. The same optimization procedures are then repeated for full and semi rigid planar frames with composite (steel and concrete) beams. A program is developed in MATLAB for all optimization procedures. Results obtained from this study proved that consideration of the contribution of the concrete on the behavior of the floor beams provides lighter planar frames.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002013145
|
oai_dc
|
Parametric resonance of composite skew plate under non-uniform in-plane loading
|
Parametric resonance of composite skew plate under non-uniform in-plane loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rajesh Kumar(Indian Institute of Technology Kharagpur); Abhinav Kumar(Indian School of Mines Dhanbad); Sarat Kumar Panda(Indian School of Mines Dhanbad)"
] |
Parametric resonance of shear deformable composite skew plates subjected to non-uniform (parabolic) and linearly varying periodic edge loading is studied for different boundary conditions. The skew plate structural model is based on higher order shear deformation theory (HSDT), which accurately predicts the numerical results for thick skew plate. The total energy functional is derived for the skew plates from total potential energy and kinetic energy of the plate. The strain energy which is the part of total potential energy contains membrane energy, bending energy, additional bending energy due to additional change in curvature and shear energy due to shear deformation, respectively. The total energy functional is solved using Rayleigh-Ritz method in conjunction with boundary characteristics orthonormal polynomials (BCOPs) functions. The orthonormal polynomials are generated for unit square domain using Gram- Schmidt orthogonalization process. Bolotin method is followed to obtain the boundaries of parametric resonance region with higher order approximation. These boundaries are traced by the periodic solution of Mathieu-Hill equations with period T and 2T. Effect of various parameters like skew angle, span-tothickness ratio, aspect ratio, boundary conditions, static load factor on parametric resonance of skew plate have been investigated. The investigation also includes influence of different types of linearly varying loading and parabolically varying bi-axial loading.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002013135
|
oai_dc
|
A finite element-experimental study of the impact of spheres on aluminium thin plates
|
A finite element-experimental study of the impact of spheres on aluminium thin plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Giancarlo B. Micheli(University of São Paulo); Larissa Driemeier(National Institute of Metrology); Marcílio Alves(University of São Paulo)"
] |
This paper describes a study of the collision of hard steel spheres against aluminium thin circular plates at speeds up to 140 m/s. The tests were monitored by a high speed camera and a chronoscope, which allowed the determination of the ballistic limit and the plate deformation pattern. Quasi-static material parameters were obtained from tests on a universal testing machine and dynamic mechanical characterization of two aluminium alloys were conducted in a split Hopkinson pressure bar. Using a damage model, the perforation of the plates was simulated by finite element analysis. Axisymmetric, shell and solid elements were employed with various parameters of the numerical analysis being thoroughly discussed, in special, the dynamic model parameters. A good agreement between experiments and the numerical analysis was obtained.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002013134
|
oai_dc
|
Frequency analysis of eccentric hemispherical shells with variable thickness
|
Frequency analysis of eccentric hemispherical shells with variable thickness
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"강재훈(중앙대학교)"
] |
A three-dimensional (3-D) method of analysis is presented for determining the free vibration frequencies of eccentric hemi-spherical shells of revolution with variable thickness. Unlike conventional shell theories, which are mathematically two-dimensional (2-D), the present method is based upon the 3-D dynamic equations of elasticity. Displacement components ur, uθ, and uz in the radial, circumferential, and axial directions, respectively, are taken to be periodic in θ and in time, and algebraic polynomials in the r and z directions. Potential and kinetic energies of eccentric hemi-spherical shells with variable thickness are formulated, and the Ritz method is used to solve the eigenvalue problem, thus yielding upper bound values of the frequencies by minimizing the frequencies. As the degree of the polynomials is increased, frequencies converge to the exact values. Convergence to three or four-digit exactitude is demonstrated for the first five frequencies of the shells. Numerical results are presented for a variety of eccentric hemi-spherical shells with variable thickness.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002013136
|
oai_dc
|
Non-linear transverse vibrations of tensioned nanobeams using nonlocal beam theory
|
Non-linear transverse vibrations of tensioned nanobeams using nonlocal beam theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Süleyman M. Bağdatlı(Celal Bayar University)"
] |
In this study, nonlinear transverse vibrations of tensioned Euler-Bernoulli nanobeams are studied. The nonlinear equations of motion including stretching of the neutral axis and axial tension are derived using nonlocal beam theory. Forcing and damping effects are included in the equations. Equation of motion is made dimensionless via dimensionless parameters. A perturbation technique, the multiple scale methods is employed for solving the nonlinear problem. Approximate solutions are applied for the equations of motion. Natural frequencies of the nanobeams for the linear problem are found from the first equation of the perturbation series. From nonlinear term of the perturbation series appear as corrections to the linear problem. The effects of the various axial tension parameters and different nonlocal parameters as well as effects of different boundary conditions on the vibrations are determined. Nonlinear frequencies are estimated; amplitude-phase modulation figures are presented for simple-simple and clamped-clamped cases.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002013140
|
oai_dc
|
Derivation of design charts based on the two-dimensional structural analysis of geotextile tubes
|
Derivation of design charts based on the two-dimensional structural analysis of geotextile tubes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김형주(군산대학교); 원명수(군산대학교); 박태웅(군산대학교); 최민준(군산대학교); Jay C. Jamin(군산대학교)"
] |
Analytical solutions for modeling geotextile tubes during the filling process and approximation method to determine the densified tube shape are reviewed. The geotextile tube filling analysis is based on Plaut & Suherman’s two-dimensional solution for geotextile tubes having a weightless and frictionless inextensible membrane resting on a rigid horizontal foundation subjected to internal and external hydrostatic pressures. The approximation for the densified tube shape developed by Leshchinsky et al. was adopted. A modified method for approximating the densified tube shape based on an areal-strain deformation analysis is introduced. Design diagrams useful for approximating geotextile tube measurements in the design process are provided.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002013138
|
oai_dc
|
Two scale modeling of behaviors of granular structure: size effects and displacement fluctuations of discrete particle assembly
|
Two scale modeling of behaviors of granular structure: size effects and displacement fluctuations of discrete particle assembly
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xihua Chu(Wuhan University); Cun Yu(Wuhan University); Chenxi Xiu(Wuhan University); Yuanjie Xu(Wuhan University)"
] |
This study’s primary aim is to check the existence of a representative volume element for granular materials and determine the link between the properties (responses) of macro structures and the size of the discrete particle assembly used to represent a constitutive relation in a two-scale model. In our two-scale method the boundary value problem on the macro level was solved using finite element method, based on the Cosserat continuum; the macro stresses and modulus were obtained using a solution of discrete particle assemblies at certain element integration points. Meanwhile, discrete particle assemblies were solved using discrete element method under boundary conditions provided by the macro deformation. Our investigations focused largely on the size effects of the discrete particle assembly and the radius of the particle on macro properties, such as deformation stiffness, bearing capacity and the residual strength of the granular structure. According to the numerical results, we suggest fitting formulas linking the values of different macro properties (responses) and size of discrete particle assemblies. In addition, this study also concerns the configuration and displacement fluctuation of discrete particle assemblies on the micro level, accompanied with the evolution of bearing capacity and deformation on the macro level.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002013139
|
oai_dc
|
The dispersion of the flexural waves in a compound hollow cylinder under imperfect contact between layers
|
The dispersion of the flexural waves in a compound hollow cylinder under imperfect contact between layers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Cengiz Ipek(Member of 2nd Committee of Kocaeli Chamber of Commerce)"
] |
The influence of the interface imperfect bonding on the flexural wave dispersion in the bilayered hollow circular cylinder is studied with utilizing three-dimensional linear theory of elastodynamics.
The shear-spring type model is used for describing the imperfect bonding on the interface between the layers and the degree of the imperfectness is estimated through the dimensionless shear-spring parameters which enter the mentioned model. The method for finding the analytical expressions for the sought values and dispersion equation are discussed and detailed. Numerical results on the lowest first and second modes are presented and analyzed. These results are obtained for various values of the shear-spring parameters.
According to these results, in particular, it is established that as a results of the imperfection of the bonding between the layers the new branches of the dispersion related the first fundamental mode arise and the character of the dispersion curve related to the second mode becomes more complicated.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002013141
|
oai_dc
|
Effects of traffic-induced vibrations on bridge-mounted overhead sign structures
|
Effects of traffic-induced vibrations on bridge-mounted overhead sign structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김장환(삼성중공업); 강준원(홍익대학교); 정희영(서울시립대학교); 백승우(삼성중공업)"
] |
Large-amplitude vibration of overhead sign structures can cause unfavorable psychological responses in motorists, interfere with readability of the signs, and lead to fatigue cracking in the sign structures. Field experience in Texas suggests that an overhead sign structure can vibrate excessively when supported within the span of a highway bridge instead of at a bent. This study used finite element modeling to analyze the dynamic displacement response of three hypothetical sign structures subjected to truckpassage- induced vertical oscillations recorded for the girders from four actual bridges. The modeled sign bridge structures included several span lengths based on standard design practices in Texas and were mounted on precast concrete I-girder bridges. Results revealed that resonance with bridge girder vertical vibrations can amplify the dynamic displacement of sign structures, and a specific range of frequency ratios subject to undesirable amplification was identified. Based on these findings, it is suggested that this type of sign structure be located at a bridge bent if its vertical motion frequency is within the identified range of bridge structure excitation frequencies. Several alternatives are investigated for cases where this is not possible, including increasing sign structure stiffness, reducing sign mass, and installing mechanical dampers.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002013144
|
oai_dc
|
Performance study on the whole vibration process of a museum induced by metro
|
Performance study on the whole vibration process of a museum induced by metro
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Weiguo Yang(Beijing Jiaotong University); Meng Wang(Beijing Jiaotong University); Jianquan Shi(Beijing Jiaotong University); Jiaqi Ge(China Aviation Planning and Construction Development Co., Ltd); Nan Zhang(Beijing Jiaotong University); Botao Ma(China Aviation Planning and Construction Development Co., Ltd)"
] |
The vibrations caused by metro operation propagate through surrounding soil, further induce secondary vibrations of the nearby underground structures and adjacent buildings. In order to investigate the effects of vibrations caused by metro on use performance of buildings, vibration experiment of Chengdu museum was carried out firstly. Then, the coupling tunnel-soil-structure finite element model was established with software ANSYS detailedly, providing a useful tool for investigating the vibration performances of structures. Furthermore, the dynamic responses and vibration predictions of museum building were obtained respectively by the whole process time-domain analysis and frequency-domain analysis, which were compared with the vibration reference values of museum. Quantitative analyses of the museum building performance were carried out, and the possible tendency and changing laws of vibration level with floors were proposed. Finally, the related vibration isolation measures were compared and discussed. The tests and analysis results show that: The vertical vibration responses almost increased with the increasing of building floors, while weak floors existed for the curve of horizontal vibration; The vertical vibrations were larger than the horizontal vibrations, indicating the vibration performances of building caused by metro were characterized with vertical vibrations; The frequencies of the museum corresponding to the peak vibration levels were around 6~17Hz; The damping effect of structure with 33m-span cantilever on vertical vibration was obvious, however, the damping effect of structure with foundation vibration isolators was not obvious.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002013142
|
oai_dc
|
Redistribution of moments in reinforced high-strength concrete beams with and without confinement
|
Redistribution of moments in reinforced high-strength concrete beams with and without confinement
|
{
"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)"
] |
Confinement is known to have important influence on ductility of high-strength concrete (HSC) members and it may therefore be anticipated that this parameter would also affect notably the moment redistribution in these members. The correctness of this “common-sense knowledge” is examined in the present study. A numerical test is performed on two-span continuous reinforced HSC beams with and without confinement using an experimentally validated nonlinear model. The results show that the effect of confinement on moment redistribution is totally different from that on flexural ductility. The moment redistribution at ultimate limit state is found to be almost independent of the confinement, provided that both the negative and positive plastic hinges have formed at failure. The numerical findings are consistent with tests performed on prototype HSC beams. Several design codes are evaluated. It is demonstrated that the code equations by Eurocode 2 (EC2), British Standards Institution (BSI) and Canadian Standards Association (CSA) can well reflect the effect of confinement on moment redistribution in reinforced HSC beams but the American Concrete Institute (ACI) code cannot.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002009072
|
oai_dc
|
Modal-based mixed vibration control for uncertain piezoelectric flexible structures
|
Modal-based mixed vibration control for uncertain piezoelectric flexible structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yalan Xu(Xidian University); Yu Qian(Xidian University); Jianjun Chen(Xidian University); Gangbing Song(University of Houston)"
] |
H-infinity norm relates to the maximum in the frequency response function and H-infinity control method focuses on the case that the vibration is excited at the fundamental frequency, while 2-norm relates to the output energy of systems with the input of pulses or white noises and 2-norm control method weighs the overall vibration performance of systems. The trade-off between the performance in frequency-domain and that in time-domain may be achieved by integrating two indices in the mixed vibration control method. Based on the linear fractional state space representation in the modal space for a piezoelectric flexible structure with uncertain modal parameters and un-modeled residual high-frequency modes, a mixed dynamic output feedback control design method is proposed to suppress the structural vibration. Using the linear matrix inequality (LMI) technique, the initial populations are generated by the designing of robust control laws with different H-infinity performance indices before the robust 2-norm performance index of the closed-loop system is included in the fitness function of optimization. A flexible beam structure with a piezoelectric sensor and a piezoelectric actuator are used as the subject for numerical studies. Compared with the velocity feedback control method, the numerical simulation results show the effectiveness of the proposed method.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002009047
|
oai_dc
|
Congestion effect on maximum dynamic stresses of bridges
|
Congestion effect on maximum dynamic stresses of bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kianoosh Samanipour(Sharif University of Technology); Hassan Vafai(Sharif University of Technology)"
] |
Bridge behavior under passing traffic loads has been studied for the past 50 years. This paper presents how to model congestion on bridges and how the maximum dynamic stress of bridges change during the passing of moving vehicles. Most current research is based on mid-span dynamic effects due to traffic load and most bridge codes define a factor called the dynamic load allowance (DLA), which is applied to the maximum static moment under static loading. This paper presents an algorithm to solve the governing equation of the bridge as well as the equations of motions of two real European trucks with different speeds, simultaneously. It will be shown, considering congestion in eight case studies, the maximum dynamic stress and how far from the mid-span it occurs during the passing of one or two trucks with different speeds. The congestion effect on the maximum dynamic stress of bridges can make a significant difference in the magnitude. By finite difference method, it will be shown that where vehicle speeds are considerably higher, for example in the case of railway bridges which have more than one railway line or in the case of multiple lane highway bridges where congestion is probable, current designing codes may predict dynamic stresses lower than actual stresses; therefore, the consequences of a full length analysis must be used to design safe bridges.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002009049
|
oai_dc
|
Effect of raft and pile stiffness on seismic response of soil-piled raft-structure system
|
Effect of raft and pile stiffness on seismic response of soil-piled raft-structure system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rajib Saha(National Institute of Technology Agartala); Sekhar C. Dutta(Indian School of Mines); Sumanta Haldar(Indian Institute of Technology)"
] |
Soil-pile raft-structure interaction is recognized as a significant phenomenon which influences the seismic behaviour of structures. Soil structure interaction (SSI) has been extensively used to analyze the response of superstructure and piled raft through various modelling and analysis techniques. Major drawback of previous study is that overall interaction among entire soil-pile raft-superstructure system considering highlighting the change in design forces of various components in structure has not been explicitly addressed. A recent study addressed this issue in a broad sense, exhibiting the possibility of increase in pile shear due to SSI. However, in this context, relative stiffness of raft and that of pile with respect to soil and length of pile plays an important role in regulating this effect. In this paper, effect of relative stiffness of piled raft and soil along with other parameters is studied using a simplified model incorporating pile-soil raft and superstructure interaction in very soft, soft and moderately stiff soil. It is observed that pile head shear may significantly increase if the relative stiffness of raft and pile increases and furthermore stiffer pile group has a stronger effect. Outcome of this study may provide insight towards the rational seismic design of piles.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002009041
|
oai_dc
|
Buckling analysis in hybrid cross-ply composite laminates on elastic foundation using the two variable refined plate theory
|
Buckling analysis in hybrid cross-ply composite laminates on elastic foundation using the two variable refined plate theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Khadidja Benselama(Université Djillali Liabes); Noureddine El Meiche(Université Djillali Liabes); El Abbas Adda Bedia(Université Djillali Liabes); Abdelwahed Tounsi(Université Djillali Liabes)"
] |
This paper presents the effect of hybridization material on variation of critical buckling load with different cross-ply laminates plate resting on elastic foundations of Winkler and Pasternak types subjected to combine uniaxial and biaxial loading by using two variable refined plate theories. Governing equations are derived from the principle of virtual displacement; the formulation is based on a new trigonometric shape function of displacement taking into account transverse shear deformation effects vary parabolically across the thickness satisfying shear stress free surface conditions. These equations are solved analytically using the Navier solution of a simply supported. The influence of the various parameters geometric and material, the thickness ratio, and the number of layers symmetric and antisymmetric hybrid laminates material has been investigated to find the critical buckling loads. The numerical results obtained through the present study with several examples are presented to verify and compared with other models with the ones available in the literature.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002009048
|
oai_dc
|
Flexural strength of roller compacted concrete pavements reinforced with glass-roved textiles
|
Flexural strength of roller compacted concrete pavements reinforced with glass-roved textiles
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Morteza Madhkhan(Isfahan University of Technology); Saeid Nowroozi(Isfahan University of Technology); Mohammad E. Torki(Texas A&M University)"
] |
The one-way (two-way) flexural strength of RCC prisms (circular slabs) reinforced with glass fiber textiles is addressed. To this end, alkaline-resistant glass fiber textiles with three surface weights were used in the composite, the matrix concrete was designed with zero/nonzero slump, and the textiles were used with/without an intermediate layer provided by epoxy resin and sand mortar. Prisms were tested under a four-point loading apparatus and circular slabs were placed on simple supports under a central load. Effects of the amount and geometry of reinforcement, matrix workability, and the intermediate layer on the ultimate load and deflection were investigated. Results revealed that, with a specific reinforcement amount, there is an optimum textile tex for each case, depending on the matrix mix design and the presence of intermediate layer. Similar results were obtained in one-way and two-way bending tests.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002009039
|
oai_dc
|
Parametric analysis and torsion design charts for axially restrained RC beams
|
Parametric analysis and torsion design charts for axially restrained RC beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Luís F.A. Bernardo(University of Beira Interior); Cátia S.B. Taborda(University of Beira Interior); Jorge M.R. Gama(University of Beira Interior)"
] |
This article presents a theoretical parametric analysis on the ultimate torsional behaviour of axially restrained reinforced concrete (RC) beams. This analysis is performed by using a computing procedure based on a modification of the Variable Angle Truss Model. This computing procedure was previously developed to account for the influence of the longitudinal compressive stress state due to the axial restraint conditions provided by the connections of the beams to other structural members. The presented parametric study aims to check the influence of some important variable studies, namely: torsional reinforcement ratio, compressive concrete strength and axial restraint level. From the results of this parametric study, nonlinear regression analyses are performed and some design charts are proposed. Such charts allow to correct the resistance torque of RC beams (rectangular sections with small height to width ratios) to account for the favorable influence of the axial restraint.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002009043
|
oai_dc
|
Free vibration analysis of damaged composite beams
|
Free vibration analysis of damaged composite beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yusuf Cunedioglu(Nigde University); Bertan Beylergil(Izmir Institute of Technology)"
] |
In this study, free vibration analyses of symmetric laminated cantilever and simply supported damaged composite beams are investigated by using finite element method (FEM). Free vibration responses of damaged beams are examined using Euler Bernoulli beam and classical lamination theories. A computer code is developed by using MATLAB software to determine the natural frequencies of a damaged beam. The local damage zone is assumed to be on the surface lamina of the beam by broken fibers after impact. The damaged zone is modeled as a unidirectional discontinuous lamina with 0o orientations in this study. Fiber volume fraction (vf), fiber aspect ratio (Lf/df), damage length (LD) and its location (λ/L), fiber orientation and stacking sequence parameters effects on natural frequencies are investigated. These parameters are affected the natural frequency values significantly.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002009044
|
oai_dc
|
Numerical analysis of crack propagation in cement PMMA: application of SED approach
|
Numerical analysis of crack propagation in cement PMMA: application of SED approach
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Benouis Ali(University of Sidi Bel-Abbes); Boulenouar Abdelkader(University of Sidi-Bel-Abbes); Benseddiq Noureddine(University of Lille); Serier Boualem(University of Sidi Bel-Abbes)"
] |
Finite element analysis (FEA) combined with the concepts of linear elastic fracture mechanics (LEFM) provides a practical and convenient means to study the fracture and crack growth of materials. In this paper, a numerical modeling of crack propagation in the cement mantle of the reconstructed acetabulum is presented. This work is based on the implementation of the displacement extrapolation method (DEM) and the strain energy density (SED) theory in a finite element code. At each crack increment length, the kinking angle is evaluated as a function of stress intensity factors (SIFs). In this paper, we analyzed the mechanical behavior of cracks initiated in the cement mantle by evaluating the SIFs. The effect of the defect on the crack propagation path was highlighted.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002009051
|
oai_dc
|
Evaluation of energy release rate of composites laminated with finite element method
|
Evaluation of energy release rate of composites laminated with finite element method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Habib Achache(University Djillali Liabes of Sidi Bel Abbes); Benali Boutabout(University Djillali Liabes of Sidi Bel Abbes); Abdelouahab Benzerdjeb(University of Science and Technology Oran Mohammed Boudiaf); Djamel Ouinas(University of Mostaganem)"
] |
Control of the mechanical behavior of composite materials and structures under monotonic and dynamic loads for cracks and damage is a vast and complex area of research. The modeling of the different physical phenomena and behavior characteristics of a composite material during deformation play an important role in the structural design. Our study aims to analyze numerically the energy release rate parameter G of a composite laminated plate (glass or boron / epoxy) cross-ply [+α, −α] in the presence of a crack between two circular notches under the effect of several parameters such as fiber orientation α, the crack orientation β, the orientation γ of the two considered circular notches and the effect of mechanical properties. Our results show clearly that both notches orientation has more effect on G than the cracks and fibers orientations.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002009052
|
oai_dc
|
A parametric investigation on the hysteretic behaviour of CFT column to steel beam connections
|
A parametric investigation on the hysteretic behaviour of CFT column to steel beam connections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"R. Esfandyary(Azad University); M.S. Razzaghi(Azad University); A. Eslami(The University of Queensland)"
] |
The results of a numerical investigation pertaining to the hysteretic behaviour of concrete filled steel tubular (CFT) column to I-beam connections are discussed in detail. Following the verification of the numerical results against the available experimental tests, the nonlinear finite element (FE) analysis was implemented to evaluate the effects of different parameters including the column axial load, beam lateral support, shape and arrangement of stiffeners, stiffness of T-stiffeners, and the number of shear stiffeners. Pursuing this objective, an external CFT column to beam connection, tested previously, was selected as the case-study. The lateral forces on the structure were simulated, albeit approximately, using an incremental cyclic loading reversal applied at the beam tip. The results were compared in terms of hysteretic loaddisplacement curves, stress distributions in connection, strength, rotation, and energy dissipation capacity. It was shown that external T-stiffeners combined with internal shear stiffeners play an important role in the hysteretic performance of CFT columns to I-beam connections.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002009042
|
oai_dc
|
Finite element analysis in static and dynamic behaviors of dental prosthesis
|
Finite element analysis in static and dynamic behaviors of dental prosthesis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"N. Djebbar(University of Sidi Bel Abbes); B. Serier(University of Sidi Bel Abbes); B. Bachir Bouiadjra(University of Sidi Bel Abbes)"
] |
In recent years, implants have gained growing importance in all areas of medicine. The success of the treatment depends on many factors affecting the bone–implant, implant–abutment and abutment–prosthesis interfaces. In this paper, static and dynamic behaviors of the dental prosthesis are investigated. Three-dimensional finite element models of dental prosthesis were constructed. Dynamic loads in 5 sec applied on occlusal surface. Therefore, FEA was selected for use in this study to examine the effect of the static and dynamic loads on the stress distribution for an implant-supported fixed partial denture and supporting bone tissue
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002009040
|
oai_dc
|
Vibrations of truncated shallow and deep conical shells with non-uniform thickness
|
Vibrations of truncated shallow and deep conical shells with non-uniform thickness
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"강재훈(중앙대학교)"
] |
A three-dimensional (3-D) method of analysis is presented for determining the natural frequencies of a truncated shallow and deep conical shell with linearly varying thickness along the meridional direction free at its top edge and clamped at its bottom edge. Unlike conventional shell theories, which are mathematically two-dimensional (2-D), the present method is based upon the 3-D dynamic equations of elasticity. Displacement components ur, uθ, and uz in the radial, circumferential, and axial directions, respectively, are taken to be periodic in θ and in time, and algebraic polynomials in the r and z directions. Strain and kinetic energies of the truncated conical shell with variable thickness are formulated, and the Ritz method is used to solve the eigenvalue problem, thus yielding upper bound values of the frequencies by minimizing the frequencies. As the degree of the polynomials is increased, frequencies converge to the exact values. Convergence to four-digit exactitude is demonstrated. The frequencies from the present 3-D method are compared with those from other 3-D finite element method and 2-D shell theories.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001980748
|
oai_dc
|
Damage assessment of shear connectors with vibration measurements and power spectral density transmissibility
|
Damage assessment of shear connectors with vibration measurements and power spectral density transmissibility
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jun Li(Curtin University); Hong Hao(Curtin University); Yong Xia(The Hong Kong Polytechnic University); Hong-ping Zhu(Huazhong University of Science and Technology)"
] |
Shear connectors are generally used to link the slab and girders together in slab-on-girderbridge structures. Damage of shear connectors in such structures will result in shear slippage between theslab and girders, which significantly reduces the load-carrying capacity of the bridge. Because shearconnectors are buried inside the structure, routine visual inspection is not able to detect conditions of shearconnectors. A few methods have been proposed in the literature to detect the condition of shear connectorsbased on vibration measurements. This paper proposes a different dynamic condition assessment approachto identify the damage of shear connectors in slab-on-girder bridge structures based on power spectraldensity transmissibility (PSDT). PSDT formulates the relationship between the auto-spectral densities oftwo responses in the frequency domain. It can be used to identify shear connector conditions with or withoutreference data of the undamaged structure (or the baseline). Measured impact force and accelerationresponses from hammer tests are analyzed to obtain the frequency response functions at sensor locations byexperimental modal analysis. PSDT from the slab response to the girder response is derived with theobtained frequency response functions. PSDT vectors in the undamaged and damaged states can becompared to identify the damage of shear connectors. When the baseline is not available, as in most practicalcases, PSDT vectors from the measured response at a reference sensor to those of the slab and girder in thedamaged state can be used to detect the damage of shear connectors. Numerical and experimental studies ona concrete slab supported by two steel girders are conducted to investigate the accuracy and efficiency of theproposed approach. Identification results demonstrate that damages of shear connectors are identifiedaccurately and efficiently with and without the baseline. The proposed method is also used to evaluate theconditions of shear connectors in a real composite bridge with in-field testing data.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001980751
|
oai_dc
|
Optimal sensor placement for health monitoring of high-rise structure based on collaborative-climb monkey algorithm
|
Optimal sensor placement for health monitoring of high-rise structure based on collaborative-climb monkey algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ting-Hua Yi(Dalian University of Technology); Hong-Nan Li(Dalian University of Technology); Xu-Dong Zhang(Dalian University of Technology); Guang-Dong Zhou(Hohai University)"
] |
Optimal sensor placement (OSP) is an integral component in the design of an effectivestructural health monitoring (SHM) system. This paper describes the implementation of a novelcollaborative-climb monkey algorithm (CMA), which combines the artificial fish swarm algorithm (AFSA)with the monkey algorithm (MA), as a strategy for the optimal placement of a predefined number of sensors.
Different from the original MA, the dual-structure coding method is adopted for the representation of designvariables. The collaborative-climb process that can make the full use of the monkeys’ experiences to guidethe movement is proposed and incorporated in the CMA to speed up the search efficiency of the algorithm.
The effectiveness of the proposed algorithm is demonstrated by a numerical example with a high-risestructure. The results show that the proposed CMA algorithm can provide a robust design for sensornetworks, which exhibits superior convergence characteristics when compared to the original MA using thedual-structure coding method.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001980749
|
oai_dc
|
Detection and parametric identification of structural nonlinear restoring forces from partial measurements of structural responses
|
Detection and parametric identification of structural nonlinear restoring forces from partial measurements of structural responses
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ying Lei(Xiamen University); Wei Hua(Xiamen University); Sujuan Luo(Xiamen University); Mingyu He(Xiamen University)"
] |
Compared with the identification of linear structures, it is more challenging to conductidentification of nonlinear structure systems, especially when the locations of structural nonlinearities are notclear in structural systems. Moreover, it is highly desirable to develop methods of parametric identificationusing partial measurements of structural responses for practical application. To cope with these issues, anidentification method is proposed in this paper for the detection and parametric identification of structuralnonlinear restoring forces using only partial measurements of structural responses. First, an equivalent linearstructural system is proposed for a nonlinear structure and the locations of structural nonlinearities aredetected. Then, the parameters of structural nonlinear restoring forces at the locations of identified structuralnonlinearities together with the linear part structural parameters are identified by the extended Kalman filter.
The proposed method simplifies the identification of nonlinear structures. Numerical examples of theidentification of two nonlinear multi-story shear frames and a planar nonlinear truss with different nonlinearmodels and locations are used to validate the proposed method.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001980747
|
oai_dc
|
Adaptive-scale damage detection strategy for plate structures based on wavelet finite element model
|
Adaptive-scale damage detection strategy for plate structures based on wavelet finite element model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wen-Yu He(Hefei University of Technology); Songye Zhu(The Hong Kong Polytechnic University)"
] |
An adaptive-scale damage detection strategy based on a wavelet finite element model (WFEM)for thin plate structures is established in this study. Equations of motion and corresponding lifting schemesfor thin plate structures are derived with the tensor products of cubic Hermite multi-wavelets as theelemental interpolation functions. Sub-element damages are localized by using of the change ratio of modalstrain energy. Subsequently, such damages are adaptively quantified by a damage quantification equationdeduced from differential equations of plate structure motion. WFEM scales vary spatially and changedynamically according to actual needs. Numerical examples clearly demonstrate that the proposed strategycan progressively locate and quantify plate damages. The strategy can operate efficiently in terms of thedegrees-of-freedom in WFEM and sensors in the vibration test.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001980754
|
oai_dc
|
Stochastic modelling and lifecycle performance assessment of bond strength of corroded reinforcement in concrete
|
Stochastic modelling and lifecycle performance assessment of bond strength of corroded reinforcement in concrete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hua-Peng Chen(University of Greenwich); Jaya Nepal(University of Greenwich)"
] |
Life cycle performance of corrosion affected RC structures is an important and challengingissue for effective infrastructure management. The accurate condition assessment of corroded RC structuresmainly depends on the effective evaluation of deterioration occurring in the structures. Structuralperformance deterioration caused by reinforcement corrosion is a complex phenomenon which is generallyuncertain and non-decreasing. Therefore, a stochastic modelling such as the gamma process can be aneffective tool to consider the temporal uncertainty associated with performance deterioration. This paperpresents a time-dependent reliability analysis of corrosion affected RC structures associated bond strengthdegradation. Initially, an analytical model to evaluate cracking in the concrete cover and the associated lossof bond between the corroded steel and the surrounding cracked concrete is developed. The analytical resultsof cover surface cracking and bond strength deterioration are examined by experimental data available. Thenthe verified analytical results are used for the stochastic deterioration modelling, presented here as gammaprocess. The application of the proposed approach is illustrated with a numerical example. The results fromthe illustrative example show that the proposed approach is capable of assessing performance of the bondstrength of concrete structures affected by reinforcement corrosion during their lifecycle.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001980745
|
oai_dc
|
Nonlinear damage detection using higher statistical moments of structural responses
|
Nonlinear damage detection using higher statistical moments of structural responses
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ling Yu(China Three Gorges University); Jun-Hua Zhu(Jinan University)"
] |
An integrated method is proposed for structural nonlinear damage detection based on time seriesanalysis and the higher statistical moments of structural responses in this study. It combines the time seriesanalysis, the higher statistical moments of AR model residual errors and the fuzzy c-means (FCM) clusteringtechniques. A few comprehensive damage indexes are developed in the arithmetic and geometric mean ofthe higher statistical moments, and are classified by using the FCM clustering method to achieve nonlineardamage detection. A series of the measured response data, downloaded from the web site of the Los AlamosNational Laboratory (LANL) USA, from a three-storey building structure considering the environmentalvariety as well as different nonlinear damage cases, are analyzed and used to assess the performance of thenew nonlinear damage detection method. The effectiveness and robustness of the new proposed method arefinally analyzed and concluded.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001980699
|
oai_dc
|
Condition assessment for high-speed railway bridges based on train-induced strain response
|
Condition assessment for high-speed railway bridges based on train-induced strain response
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhonglong Li(Harbin Institute of Technology); Shunlong Li(Harbin Institute of Technology); Jia Lv(Harbin Municipal Engineering Design Institute); Hui Li(Harbin Institute of Technology)"
] |
This paper presents the non-destructive evaluation of a high-speed railway bridge usingtrain-induced strain responses. Based on the train-track-bridge interaction analysis, the strain responses of ahigh-speed railway bridge under moving trains with different operation status could be calculated. The traininduced strain responses could be divided into two parts: the force vibration stage and the free vibrationstage. The strain-displacement relationship is analysed and used for deriving critical displacements fromtheoretical stain measurements at a forced vibration stage. The derived displacements would be suitable forthe condition assessment of the bridge through design specifications defined indexes and would show certainlimits to the practical application. Thus, the damage identification of high-speed railways, such as thestiffness degradation location, needs to be done by comparing the measured strain response under movingtrains in different states because the vehicle types of high-speed railway are relatively clear and definite. Themonitored strain responses at the free vibration stage, after trains pass through the bridge, would be used foridentifying the strain modes. The relationship between and the degradation degree and the strain modeshapes shows certain rules for the widely used simply supported beam bridges. The numerical simulationproves simple and effective for the proposed method to locate and quantify the stiffness degradation.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001980801
|
oai_dc
|
Probabilistic real-time updating for geotechnical properties evaluation
|
Probabilistic real-time updating for geotechnical properties evaluation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Iok-Tong Ng(University of Macau); Ka-Veng Yuen(University of Macau); Le Dong(University of Macau)"
] |
Estimation of geotechnical properties is an essential but challenging task since they are majorcomponents governing the safety and reliability of the entire structural system. However, due to time andbudget constraints, reliable geotechnical properties estimation using traditional site characterizationapproach is difficult. In view of this, an alternative efficient and cost effective approach to address theoverall uncertainty is necessary to facilitate an economical, safe and reliable geotechnical design. In thispaper a probabilistic approach is proposed for real-time updating by incorporating new geotechnicalinformation from the underlying project site. The updated model obtained from the proposed method isadvantageous because it incorporates information from both existing database and the site of concern. Anapplication using real data from a site in Hong Kong will be presented to demonstrate the proposed method.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001980806
|
oai_dc
|
Structural damage detection by principle component analysis of long-gauge dynamic strains
|
Structural damage detection by principle component analysis of long-gauge dynamic strains
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Q. Xia(Southeast University); Y.D. Tian(Southeast University); X.W. Zhu(Southeast University); D.W. Xu(Southeast University); J. Zhang(Southeast University)"
] |
A number of acceleration-based damage detection methods have been developed but they havenot been widely applied in engineering practices because the acceleration response is insensitive to minordamage of civil structures. In this article, a damage detection approach using the long-gauge strain sensingtechnology and the principle component analysis technology is proposed. The Long gauge FBG sensor hasits special merit for damage detection by measuring the averaged strain over a long-gauge length, and it canbe connected each other to make a distributed sensor network for monitoring the large-scale civilinfrastructure. A new damage index is defined by performing the principle component analyses of thelong-gauge strains measured from the intact and damaged structures respectively. Advantages of the longgauge sensing and the principle component analysis technologies guarantee the effectiveness for structuraldamage localization. Examples of a simple supported beam and a steel stringer bridge have beeninvestigated to illustrate the successful applications of the proposed method for structural damage detection.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001980796
|
oai_dc
|
Structural damage alarming and localization of cable-supported bridges using multi-novelty indices: a feasibility study
|
Structural damage alarming and localization of cable-supported bridges using multi-novelty indices: a feasibility study
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yi-Qing Ni(The Hong Kong Polytechnic University); Junfang Wang(The Hong Kong Polytechnic University); Tommy H.T. Chan(Queensland University of Technology)"
] |
This paper presents a feasibility study on structural damage alarming and localization of longspancable-supported bridges using multi-novelty indices formulated by monitoring-derived modalparameters. The proposed method which requires neither structural model nor damage model is applicable tostructures of arbitrary complexity. With the intention to enhance the tolerance to measurementnoise/uncertainty and the sensitivity to structural damage, an improved novelty index is formulated in termsof auto-associative neural networks (ANNs) where the output vector is designated to differ from the inputvector while the training of the ANNs needs only the measured modal properties of the intact structure underin-service conditions. After validating the enhanced capability of the improved novelty index for structuraldamage alarming over the commonly configured novelty index, the performance of the improved noveltyindex for damage occurrence detection of large-scale bridges is examined through numerical simulationstudies of the suspension Tsing Ma Bridge (TMB) and the cable-stayed Ting Kau Bridge (TKB) incurredwith different types of structural damage. Then the improved novelty index is extended to formulate multinoveltyindices in terms of the measured modal frequencies and incomplete modeshape components fordamage region identification. The capability of the formulated multi-novelty indices for damage regionidentification is also examined through numerical simulations of the TMB and TKB.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001972698
|
oai_dc
|
Buckling of axial compressed cylindrical shells with stepwise variable thickness
|
Buckling of axial compressed cylindrical shells with stepwise variable thickness
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H.G. Fan(Zhejiang University); Z.P. Chen(Zhejiang University); W.Z. Feng(Zhejiang University); F. Zhou(Zhejiang University); X.L. Shen(F. Zhou); G.W. Cao(Zhejiang University)"
] |
This paper focuses on an analytical research on the critical buckling load of cylindrical shells with stepwise variable wall thickness under axial compression. An arctan function is established to describe the thickness variation along the axial direction of this kind of cylindrical shells accurately. By using the methods of separation of variables, small parameter perturbation and Fourier series expansion, analytical formulas of the critical buckling load of cylindrical shells with arbitrary axisymmetric thickness variation under axial compression are derived. The analysis is based on the thin shell theory. Analytic results show that the critical buckling load of the uniform shell with constant thickness obtained from this paper is identical with the classical solution. Two important cases of thickness variation pattern are also investigated with these analytical formulas and the results coincide well with those obtained from other authors. The cylindrical shells with stepwise variable wall thickness, which are widely used in actual engineering, are studied by this method and the analytical formulas of critical buckling load under axial compression are obtained. Furthermore, an example is presented to illustrate the effects of each strake’s length and thickness on the critical buckling load.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001972701
|
oai_dc
|
Structural behavior of aluminum reticulated shell structures considering semi-rigid and skin effect
|
Structural behavior of aluminum reticulated shell structures considering semi-rigid and skin effect
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hongbo Liu(Tianjin University); Zhihua Chen(Tianjin University); Shuai Xu(Tianjin University); Yidu Bu(Tianjin University)"
] |
The aluminum dome has been widely used in natatorium, oil storage tank, power plant, coal, as well as other industrial buildings and structures. However, few research has focused on the structural behavior and design method of this dome. At present, most designs of aluminum alloy domes have referred to theories and methods of steel spatial structures. However, aluminum domes and steel domes have many differences, such as elasticity moduli, roof structures, and joint rigidities, which make the design and analysis method of steel spatial structures not fully suitable for aluminum alloy dome structures. In this study, a stability analysis method, which can consider structural imperfection, member initial curvature, semi-rigid joint, and skin effect, was presented and used to study the stability behavior of aluminum dome structures. In addition, some meaningful conclusions were obtained, which could be used in future designs and analyses of aluminum domes.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001972703
|
oai_dc
|
Effect of the rotation on a non-homogeneous infinite cylinder of orthotropic material with external magnetic field
|
Effect of the rotation on a non-homogeneous infinite cylinder of orthotropic material with external magnetic field
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Nahed S. Hussein(Taif University); F.S. Bayones(Taif University); S.R. Mahmoud(King Abdulaziz University)"
] |
The present investigation is concerned with a study effect of magnetic field and nonhomogenous on the elastic stresses in rotating orthotropic infinite circular cylinder. A certain boundary conditions closed form stress fields solutions are obtained for rotating orthotropic cylinder under initial magnetic field with constant thickness for three cases: (1) Solid cylinder, (2) Cylinder with a circular hole at the center, (3) Cylinder mounted on a circular rigid shaft. Analytical expressions for the components of the displacement and stress fields in different cases are obtained. The effect of rotation and magnetic field and non-homogeneity on the displacement and stress fields are studied. Numerical results are illustrated graphically for each case. The effects of rotating and magnetic field and non-homogeneity are discussed.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001972696
|
oai_dc
|
On the absolute maximum dynamic response of a beam subjected to a moving mass
|
On the absolute maximum dynamic response of a beam subjected to a moving mass
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Ali Lotfollahi-Yaghin(University of Tabriz); Hassan Jafarian Kafshgarkolaei(University of Tabriz); Hamed Allahyari(Babol University of Technology); Taher Ghazvini(Babol University of Technology)"
] |
Taking the mid-span/center-point of the structure as the reference point of capturing the maximum dynamic response is very customary in the available literature of the moving load problems. In this article, the absolute maximum dynamic response of an Euler-Bernoulli beam subjected to a moving mass is widely investigated for various boundary conditions of the base beam. The response of the beam is obtained by utilizing a robust numerical method so-called OPSEM (Orthonormal Polynomial Series Expansion Method). It is underlined that the absolute maximum dynamic response of the beam does notnecessarily take place at the mid-span of the beam and thus the conventional analysis needs modifications. Therefore, a comprehensive parametric survey of the base beam absolute maximum dynamic response is represented in which the contribution of the velocity and weight of the moving inertial objects are scrutinized and compared to the conventional version (maximum at mid-span).
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001972704
|
oai_dc
|
Reliabilities of distances describing bolt placement for high strength steel connections
|
Reliabilities of distances describing bolt placement for high strength steel connections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ertekin Öztekin(Gumushane University)"
] |
In the bolted connections, bolt placements are generally described and are generally made in the direction of design effects and in the perpendicular direction to design effects. In these both directions, the reliability of the distance of bolts to the edges of connection plate and the distance of bolts to each other is investigated for high strength steel connections built up with high strength bolts in this study. For this purpose, simple SL (bearing type shear connection) and SLP (bearing type shear connection for body-fit bolts) type steel connections with St 52 grade steel plates with 8 different thicknesses and with 8.8D grade high strength bolts (HV) were constituted and analyzed under H (Dead Loads+Live Loads+Snow Loads+Roof Loads) and HZ (H Loads+Wind Loads+Earthquake Loads) loadings. Geometric properties, material properties and design actions were taken as random variables. Monte Carlo Simulation method was used to compute failure risk and the first order second moment method was used to determine the reliability indexes of those different distances describing the placement of bolts. Results obtained from computations have been presented in graphics and in a Table. Then, they were compared with some values proposed by some structural codes. Finally, new equations were constituted for minimum and maximum values of distances describing bolt placement by regression analyses performed on those results.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001972691
|
oai_dc
|
Seismic and progressive collapse assessment of SidePlate moment connection system
|
Seismic and progressive collapse assessment of SidePlate moment connection system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Iman Faridmehr(Universiti Teknologi Malaysia); Mohd Hanim Osman(Universiti Teknologi Malaysia); Mahmood Bin Md. Tahir(Universiti Teknologi Malaysia); Ali Farokhi Nejad(Universiti Teknologi Malaysia); Reza Hodjati(Islamic Azad University)"
] |
The performance of a newly generated steel connection known as SidePlateTM moment connection for seismic loading and progressive collapse phenomenon has been investigated in this paper. The seismic evaluation portion of the study included a thorough study on of interstory drift angles and flexural strengths based on 2010 AISC Seismic Provisions while the acceptance criteria provided in UFC 4-023-03 guideline to resist progressive collapse must be satisfied by the rotational capacity of the connections. The results showed that the SidePlate moment connection was capable of attaining adequate rotational capacity and developing full inelastic capacity of the connecting beam. Moreover, the proposed connection demonstrated an exceptional performance for keeping away the plastic hinges from the connection and exceeding interstory drift angle of 0.06 rad with no fracture developments in beam flange groove-welded joints. The test results indicated that this type of connection had strength, stiffness and ductility to be categorized as a rigid, full-strength and ductile connection.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001972689
|
oai_dc
|
Behavior and crack development of fiber-reinforced concrete spandrel beams under combined loading: an experimental study
|
Behavior and crack development of fiber-reinforced concrete spandrel beams under combined loading: an experimental study
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Omer Farouk Ibraheem(University Sains Malaysia (USM)); B.H. Abu Bakar(University Sains Malaysia (USM)); I. Johari(University Sains Malaysia (USM))"
] |
An experimental investigation is conducted to examine the behavior and cracking of steel fiberreinforced concrete spandrel L-shaped beams subjected to combined torsion, bending, and shear. The experimental program includes 12 medium-sized L-shaped spandrel beams organized into two groups, namely, specimens with longitudinal reinforcing bars, and specimens with bars and stirrups. All cases are examined with 0%, 1%, and 1.5% steel fiber volume fractions and tested under two different loading eccentricities. Test results indicate that the torque to shear ratio has a significant effect on the crack pattern developed in the beams. The strain on concrete surface follows the crack width value, and the addition of steel fibers reduces the strain. Fibrous concrete beams exhibited improved overall torsional performance compared with the corresponding non-fibrous control beams, particularly the beams tested under high eccentricity.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001972707
|
oai_dc
|
Torsional analysis of a single-bent leaf flexure
|
Torsional analysis of a single-bent leaf flexure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Nghia Huu Nguyen(영남대학교); 임병덕(영남대학교); 이동연(영남대학교)"
] |
We present a torsion analysis of single-bent leaf flexure that is partially restrained, subject to a torsional load. The theoretical equations for the torsional angle are derived using Castigliano’s theorem. These equations consider the partially restrained warping, 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 result and the FEA result are lower than 6%. This indicates that the proposed theoretical torsional analysis with partially restrained warping is sufficiently accurate.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001972700
|
oai_dc
|
An improved modal strain energy method for structural damage detection, 2D simulation
|
An improved modal strain energy method for structural damage detection, 2D simulation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Parviz Moradipour(Queensland University of Technology); Tommy H.T. Chan(Queensland University of Technology); Chaminda Gallage(Queensland University of Technology)"
] |
Structural damage detection using modal strain energy (MSE) is one of the most efficient and reliable structural health monitoring techniques. However, some of the existing MSE methods have been validated for special types of structures such as beams or steel truss bridges which demands improving the available methods. The purpose of this study is to improve an efficient modal strain energy method to detect and quantify the damage in complex structures at early stage of formation. In this paper, a modal strain energy method was mathematically developed and then numerically applied to a fixed-end beam and a three-story frame including single and multiple damage scenarios in absence and presence of up to five per cent noise. For each damage scenario, all mode shapes and natural frequencies of intact structures and the first five mode shapes of assumed damaged structures were obtained using STRAND7. The derived mode shapes of each intact and damaged structure at any damage scenario were then separately used in the improved formulation using MATLAB to detect the location and quantify the severity of damage as compared to those obtained from previous method. It was found that the improved method is more accurate, efficient and convergent than its predecessors. The outcomes of this study can be safely and inexpensively used for structural health monitoring to minimize the loss of lives and property by identifying the unforeseen structural damages.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001972705
|
oai_dc
|
Seismic responses of base-isolated nuclear power plant structures considering spatially varying ground motions
|
Seismic responses of base-isolated nuclear power plant structures considering spatially varying ground motions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"MOHAMEDMOHAMED ABDELMONEM SAYED(군산대학교); 고성혁(군산대학교); 조성국(Innose Tech Co. Ltd.); 김두기(군산대학교)"
] |
This study presents the effects of the spatial variation of ground motions in a hard rock site on the seismic responses of a base-isolated nuclear power plant (BI-NPP). Three structural models were studied for the BI-NPP supported by different number of lead rubber bearing (LRB) base isolators with different base mat dimensions. The seismic responses of the BI-NPP were analyzed and investigated under the uniform and spatial varying excitation of El Centro ground motion. In addition, the rotational degrees of freedom (DOFs) of the base mat nodes were taken to consider the flexural behavior of the base mat on the seismic responses under both uniform and spatial varying excitation. Finally, the seismic response results for all the analysis cases of the BI-NPP were investigated in terms of the vibration periods and mode shapes, lateral displacements, and base shear forces. The analysis results indicate that: (1) considering the flexural behavior of the base mat has a negligible effect on the lateral displacements of base isolators regardless of the number of the isolators or the type of excitation used; (2) considering the spatial variation of ground motions has a substantial influence on the lateral displacements of base isolators and the NPP stick model; (3) the ground motion spatial variation effect is more prominent on lateral displacements than base shear forces, particularly with increasing numbers of base isolators and neglecting flexural behavior of the base mat.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001972690
|
oai_dc
|
Displacement-based seismic design of open ground storey buildings
|
Displacement-based seismic design of open ground storey buildings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jiji Anna Varughese(Government Engineering College); Devdas Menon(Indian Institute of Technology); A. Meher Prasad(Indian Institute of Technology)"
] |
Open ground storey (OGS) buildings are characterized by the sudden reduction of stiffness in the ground storey with respect to the upper infilled storeys. During earthquakes, this vertical irregularity may result in accumulated damage in the ground storey members of OGS buildings without much damage in the upper storeys. Hence, the structural design of OGS buildings needs special attention. The present study suggests a modification of existing displacement-based design (DBD) procedure by proposing a new lateral load distribution. The increased demands of ground storey members of OGS buildings are estimated based on non-linear time history analysis results of four sets of bare and OGS frames having four to ten storey heights. The relationship between the increased demand and the relative stiffness of ground storey (with respect to upper storeys) is taken as the criterion for developing the expression for the design lateral load. It is also observed that under far-field earthquakes, there is a decrease in the ground storey drift of OGS frames as the height of the frame increases, whereas there is no such reduction when these frames are subjected to near-field earthquakes.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001972697
|
oai_dc
|
Analytical and finite element solution of a receding contact problem
|
Analytical and finite element solution of a receding contact problem
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gökhan Adıyaman(Karadeniz Technical University); Murat Yaylacı(Recep Tayyip Erdoğan Üniversity); Ahmet Birinci(Karadeniz Technical University)"
] |
In this paper, a receding contact problem for an elastic layer resting on two quarter planes is considered. The layer is pressed by a stamp and distributed loads. It is assumed that the contact surfaces are frictionless and only compressive traction can be transmitted through the contact surfaces. In addition the effect of body forces are neglected. Firstly, the problem is solved analytically based on theory of elasticity. In this solution, the problem is reduced into a system of singular integral equations in which contact areas and contact stresses are unknowns using boundary conditions and integral transform techniques. This system is solved numerically using Gauss-Jacobi integral formulation. Secondly, two dimensional finite element analysis of the problem is carried out using ANSYS. The dimensionless quantities for the contact areas and the contact pressures are calculated under various distributed load conditions using both solutions. It is concluded that the position and the magnitude of the distributed load have an important role on the contact area and contact pressure distribution between layer and quarter plane contact surface. The analytic results are verified by comparison with finite element results.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002015895
|
oai_dc
|
Random imperfection effect on reliability of space structures with different supports
|
Random imperfection effect on reliability of space structures with different supports
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mehrzad Tahamouli Roudsari(Kermanshah Branch, Islamic Azad University); Mehrdad Gordini(Kermanshah Branch, Islamic Azad University)"
] |
The existence of initial imperfections in manufacturing or assembly of double-layer space structures having hundreds or thousands of members is inevitable. Many of the imperfections, such as the initial curvature of the members and residual stresses in members, are all random in nature. In this paper, the probabilistic effect of initial curvature imperfections in the load bearing capacity of double-layer grid space structures with different types of supports have been investigated. First, for the initial curvature imperfection of each member, a random number is generated from a gamma distribution. Then, by employing the same probabilistic model, the imperfections are randomly distributed amongst the members of the structure. Afterwards, the collapse behavior and the ultimate bearing capacity of the structure are determined by using nonlinear push down analysis and this procedure is frequently repeated. Ultimately, based on the maximum values of bearing capacity acquired from the analysis of different samples, structure’s reliability is obtained by using Monte Carlo simulation method. The results show the sensitivity of the collapse behavior of double-layer grid space structures to the random distribution of initial imperfections and supports type.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002015909
|
oai_dc
|
Repair of flange damage steel-concrete composite girders using CFRP sheets
|
Repair of flange damage steel-concrete composite girders using CFRP sheets
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lianguang Wang(Northeastern University Shenyang); Wenyu Hou(Northeastern University Shenyang); Huafeng Han(Northeastern University Shenyang); Junhua Huo(Liaoning Provincial College of Communications Shenyang)"
] |
Damaged steel-concrete composite girders can be repaired and retrofitted by epoxy-bonded carbon fiber-reinforced polymer (CFRP) sheets to the critical areas of tension flanges. This paper presents the results of a study on the behavior of damaged steel-concrete composite girders repaired with CFRP sheets under static loading. A total of seven composite girders made of I20A steel sections and 80mm-thick by 900mm-wide concrete slabs were prepared and tested. CFRP sheets and prestressed CFRP sheets were used to repair the specimens. The specimens lost the cross-sectional area of their tension flanges with 30%, 50% and 100%. The results showed that CFRP sheets had no significant effect on the yield loads of strengthened composite girders, but had significant effect on the ultimate loads. The yield loads, elastic stiffness, and ultimate bearing capacities of strengthened composite girders had been changed as a result of prestressed CFRP sheets, the utilization ratio of CFRP sheets could be effectively improved by applying prestress to CFRP sheets. Both the yield loads and ultimate bearing capacities had been changed as a result of steel beam’s flange damage level and CFRP sheets could cover the girders’ shortage of bearing capacity with 30% and 50% flange damage, respectively.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002015899
|
oai_dc
|
Application of graded harmonic FE in the analysis of 2D-FGM axisymmetric structures
|
Application of graded harmonic FE in the analysis of 2D-FGM axisymmetric structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ali I. Karakas(Karadeniz Technical University); Ayse T. Daloglu(Karadeniz Technical University)"
] |
A graded harmonic finite element formulation based on three-dimensional elasticity theory is developed for the structural analysis of 2D functionally graded axisymmetric structures. The mechanical properties of the axisymmetric solid structures composed of two different metals and ceramics are assumed to vary in radial and axial directions according to power law variations as a function of the volume fractions of the constituents. The material properties of the graded element are calculated at the integration points. Effects of material distribution profile on the static deformation, natural frequency and dynamic response analyses of particular axisymmetric solid structures are investigated by changing the power law exponents. It is observed that the displacements, stresses and natural frequencies are severely affected by the variation of axial and radial power law exponents. Good accuracy is obtained with fewer elements in the present study since Fourier series expansion eliminates the need of finite element mesh in circumferential direction and continuous material property distribution within the elements improves accuracy without refining the mesh size in axial and radial directions.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002015918
|
oai_dc
|
Optimum design of steel frame structures by a modified dolphin echolocation algorithm
|
Optimum design of steel frame structures by a modified dolphin echolocation algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Saeed Gholizadeh(Urmia University); Hamed Poorhoseini(Urmia University)"
] |
Dolphin echolocation (DE) optimization algorithm is a recently developed meta-heuristic in which echolocation behavior of Dolphins is utilized for seeking a design space. The computational performance of meta-heuristic algorithms is highly dependent to its internal parameters. But the computational time of adjusting these parameters is usually extensive. The DE is an efficient optimization algorithm as it includes few internal parameters compared with other meta-heuristics. In the present paper a modified Dolphin echolocation (MDE) algorithm is proposed for optimization of steel frame structures. In the MDE the step locations are determined using one-dimensional chaotic maps and this improves the convergence behavior of the algorithm. The effectiveness of the proposed MDE algorithm is illustrated in three benchmark steel frame optimization test examples. Results demonstrate the efficiency of the proposed MDE algorithm in finding better solutions compared to standard DE and other existing algorithms.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002015921
|
oai_dc
|
Shape optimization for partial double-layer spherical reticulated shells of pyramidal system
|
Shape optimization for partial double-layer spherical reticulated shells of pyramidal system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J. Wu(Shandong Jianzhu University); Z.H. Xu(Shandong University); X.Y. Lu(Shandong Jianzhu University); S.C. Li(Shandong University); D.L. Zhang(Shandong Agriculture and Engineering University); L.P. Li(Shandong University); Y.G. Xue(Shandong University)"
] |
Triangular pyramid and Quadrangular pyramid elements for partial double-layer spherical reticulated shells of pyramidal system are investigated in the present study. Macro programs for six typical partial double-layer spherical reticulated shells of pyramidal system are compiled by using the ANSYS Parametric Design Language (APDL). Internal force analysis of six spherical reticulated shells is carried out. Distribution regularity of the stress and displacement are studied. A shape optimization program is proposed by adopting the sequence two-stage algorithm (RDQA) in FORTRAN environment based on the characteristics of partial double-layer spherical reticulated shells of pyramidal system and the ideas of discrete variable optimization design. Shape optimization is achieved by considering the objective function of the minimum total steel consumption, global and locality constraints. The shape optimization of six spherical reticulated shells is calculated with the span of 30m~120m and rise to span ratio of 1/7~1/3. The variations of the total steel consumption along with the span and rise to span ratio are discussed with contrast to the results of shape optimization. The optimal combination of main design parameters for six spherical reticulated shells is investigated, i.e., the number of the optimal grids. The results show that: (1) The Kiewitt and Geodesic partial double-layer spherical reticulated shells of triangular pyramidal system should be preferentially adopted in large and medium-span structures. The range of rise to span ratio is from 1/6 to 1/5. (2) The Ribbed and Schwedler partial double-layer spherical reticulated shells of quadrangular pyramidal system should be preferentially adopted in small-span structures. The rise to span ratio should be 1/4. (3) Grids of the six spherical reticulated shells can be optimized after shape optimization and the total steel consumption is optimized to be the least.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002015904
|
oai_dc
|
Small scale effect on the vibration of non-uniform nanoplates
|
Small scale effect on the vibration of non-uniform nanoplates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Chakraverty(National Institute of Technology Rourkela); Laxmi Behera(National Institute of Technology Rourkela)"
] |
Free vibration of non-uniform embedded nanoplates based on classical (Kirchhoff’s) plate theory in conjunction with nonlocal elasticity theory has been studied. The nanoplate is assumed to be rested on two-parameter Winkler-Pasternak elastic foundation. Non-uniform material properties of nanoplates have been considered by taking linear as well as quadratic variations of Young’s modulus and density along the space coordinates. Detailed analysis has been reported for all possible cases of such variations. Trial functions denoting transverse deflection of the plate are expressed in simple algebraic polynomial forms. Application of the present method converts the problem into generalised eigen value problem. The study aims to investigate the effects of non-uniform parameter, elastic foundation, nonlocal parameter, boundary condition, aspect ratio and length of nanoplates on the frequency parameters. Three- dimensional mode shapes for some of the boundary conditions have also been illustrated. One may note that present method is easier to handle any sets of boundary conditions at the edges.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002015931
|
oai_dc
|
Strength and durability of ultra fine slag based high strength concrete
|
Strength and durability of ultra fine slag based high strength concrete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Pichaiya Sharmila(Sastra University); Govindasamy Dhinakaran(Sastra University)"
] |
The use of ground granulated blast furnace slag (GGBFS) from steel industries waste is showing perspective application in civil engineering as partial substitute to cement. Use of such waste conserves natural resources and minimizes the space required for landfill. The GGBFS used in the present work is of ultra fine size and hence serves as micro filler. In this paper strength and durability characteristics of ultra fine slag based high strength concrete (HSC) (with a characteristic compressive strength of 50 MPa) were studied. Cement was replaced with ultra fine slag in different percentages of 5, 10, and 15% to study the compressive strength, porosity, resistances against sulfate attack, sorptivity and chloride ion penetration. The experiments to study compressive strength were conducted for different ages of concrete such as 7, 28, 56, and 90 days. From the detailed investigations with 16 mix combinations, 10% ultra fine slag give better results in terms of strength and durability characteristics.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002015925
|
oai_dc
|
Buckling analysis of semi-rigid gabled frames
|
Buckling analysis of semi-rigid gabled frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Rezaiee-Pajand(Ferdowsi University of Mashhad); Farzad Shahabian(Ferdowsi University of Mashhad); Mohsen Bambaeechee(Ferdowsi University of Mashhad)"
] |
It is intended to perform buckling analysis of steel gabled frames with tapered members and flexible connections. The method is based on the exact solutions of the governing differential equations for stability of a gabled frame with I-section elements. Corresponding buckling load and subsequently effective length factor are obtained for practical use. For several popular frames, the influences of the shape factor, taper ratio, span ratio, flexibility of connections and elastic rotational and translational restraints on the critical load, and corresponding equivalent effective length coefficient are studied. Some of the outcomes are compared against available solutions, demonstrating the accuracy, efficiency and capabilities of the presented approach.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002015929
|
oai_dc
|
Simplified model to study the dynamic behaviour of a bolted joint and its self loosening
|
Simplified model to study the dynamic behaviour of a bolted joint and its self loosening
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Olfa Ksentini(Sfax University); Bertrand Combes(University of Toulouse); Mohamed Slim Abbes(Sfax University); Alain Daidié(University of Toulouse); Mohamed Haddar(Sfax University)"
] |
Bolted joints are essential elements of mechanical structures and metal constructions. Although their static behaviour is fairly well known, their dynamic behaviour due to shocks and vibrations has been less studied, because of the large size of the finite element models needed for a detailed simulation. This work presents four different simplified models suitable for studying the dynamic behaviour of an elementary bolted joint. Three of them include contact elements to allow sliding of the screw head and the nut on the assembled parts, and the last one allows rotation between screw and nut. A penalty approach based on the Coulomb friction model is used to model contact. The results show that these models effectively represent the dynamic behaviour, with different accuracy depending on the model details. The last model simulates the self loosening of a bolt subjected to transversal vibrations.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002015930
|
oai_dc
|
A new analytical approach for determination of flexural, axial and torsional natural frequencies of beams
|
A new analytical approach for determination of flexural, axial and torsional natural frequencies of beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mehrdad Mohammadnejad(Birjand University of Technology)"
] |
In this paper, a new and simplified method is presented in which the natural frequencies of the uniform and non-uniform beams are calculated through simple mathematical relationships. The various vibration problems such as: Rayleigh beam under variable axial force, axial vibration of a bar with and without end discrete spring, torsional vibration of a bar with an attached mass moment of inertia, flexural vibration of the beam with laterally distributed elastic springs and also flexural vibration of the beam with effects of viscose damping are investigated. The governing differential equations are first obtained and then; according to a harmonic vibration, are converted into single variable equations in terms of location. Through repetitive integrations, the governing equations are converted into weak form integral equations. The mode shape functions of the vibration are approximated using a power series. Substitution of the power series into the integral equations results in a system of linear algebraic equations. The natural frequencies are determined by calculation of a non-trivial solution for system of equations. The efficiency and convergence rate of the current approach are investigated through comparison of the numerical results obtained with those obtained from other published references and results of available finite element software.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002015916
|
oai_dc
|
Time-variant structural fuzzy reliability analysis under stochastic loads applied several times
|
Time-variant structural fuzzy reliability analysis under stochastic loads applied several times
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yongfeng Fang(Guizhou University of Science Engineering); Jianbin Xiong(Guangdong University of Petrochemical Technology); Kong Fah Tee(University of Greenwich)"
] |
A new structural dynamic fuzzy reliability analysis under stochastic loads which are applied several times is proposed in this paper. The fuzzy reliability prediction models based on time responses with and without strength degeneration are established using the stress-strength interference theory. The random loads are applied several times and fuzzy structural strength is analyzed. The efficiency of the proposed method is demonstrated numerically through an example. The results have shown that the proposed method is practicable, feasible and gives a reasonably accurate prediction. The analysis shows that the probabilistic reliability is a special case of fuzzy reliability and fuzzy reliability of structural strength without degeneration is also a special case of fuzzy reliability with structural strength degeneration.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART002015923
|
oai_dc
|
Modal characteristics of partially perforated rectangular plate with triangular penetration pattern
|
Modal characteristics of partially perforated rectangular plate with triangular penetration pattern
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Myung J. Jhung(Korea Institute of Nuclear Safety); Kyeong H. Jeong(Korea Atomic Energy Research Institute)"
] |
There are so many applications of perforated pates with various penetration patterns. If they are penetrated regularly, it can be represented by solid plate with equivalent material properties, which has a benefit of finite element modelling and reducing computation time for the analysis. Because the equivalent material properties suggested already are not proper to be applicable for the dynamic analysis, it is necessary to extract the equivalent material properties for the dynamic analysis. Therefore, in this study, the equivalent modulus of elasticity are obtained for the perforated plate with a triangular penetration pattern by comparing the natural frequencies of the perforated plate with those of solid plate, which are represented with respect to the ligament efficacy. Using the equivalent material properties suggested, the modal analyses of the partially perforated rectangular plate with a triangular penetration pattern are performed and its applicability is shown by comparing natural frequencies of perforated and homogeneous solid plates from finite element method and analytical method.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001997234
|
oai_dc
|
Analysis of composite girders with hybrid GFRP hat-shape sections and concrete slab
|
Analysis of composite girders with hybrid GFRP hat-shape sections and concrete slab
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Elham Alizadeh(Babol Noshirvani University of Technology); Mehdi Dehestani(Babol Noshirvani University of Technology)"
] |
Most of current bridge decks are made of reinforced concrete and often deteriorate at a relatively rapid rate in operational environments. The quick deterioration of the deck often impacts other critical components of the bridge. Another disadvantage of the concrete deck is its high weight in long-span bridges. Therefore, it is essential to examine new materials and innovative designs using hybrid system consisting conventional materials such as concrete and steel with FRP plates which is also known as composite deck. Since these decks are relatively new, so it would be useful to evaluate their performances in more details. The present study is dedicated to Hat-Shape composite girder with concrete slab. The structural performance of girder was evaluated with nonlinear finite element method by using ABAQUS and numerical results have been compared with experimental results of other researches. After ensuring the validity of numerical modeling of composite deck, parametric studies have been conducted; such as investigating the effects of constituent properties by changing the compressive strength of concrete slab and Elasticity modulus of GFRP materials. The efficacy of the GFRP box girders has been studied by changing GFRP material to steel and aluminum. In addition, the effect of Cross-Sectional Configuration has been evaluated. It was found that the behavior of this type of composite girders can be studied with numerical methods without carrying out costly experiments. The material properties can be modified to improve ultimate load capacity of the composite girder. strength-to-weight ratio of the girder increased by changing the GFRP material to aluminum and ultimate load capacity enhanced by deformation of composite girder cross-section.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001997233
|
oai_dc
|
Rebar corrosion effects on structural behavior of buildings
|
Rebar corrosion effects on structural behavior of buildings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"İsa Yüksel(Bursa Technical University)"
] |
Rebar corrosion in concrete is one of the main causes of reduction of service life of reinforced concrete buildings. This paper presents the influence of rebar corrosion on the structural behavior of reinforced concrete (RC) buildings subjected to strong earthquake ground motion. Different levels of rebar corrosion scenarios were applied on a typical four story RC frame. The deteriorated conditions as a result of these scenarios include loss in cross-sectional area and loss of mechanical properties of the reinforcement bars, loss in bond strength, and loss in concrete strength and its modulus of elasticity. Dynamic analyses of the frame with different corrosion scenarios are performed with selected strong earthquake ground motion records. The influences of degradation in both concrete and reinforcement on structural behavior are investigated by comparing the various parameters of the frame under different corrosion scenarios with respect to each other. The results show that the progressive deterioration of the frame due to rebar corrosion causes serious structural behavior changes such as change in failure mode. The intensity, propagation time, and extensity of rebar corrosion have very important effects on the level of degradation of steel and concrete, as well as on the earthquake behavior of the structure.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001997231
|
oai_dc
|
A review of the application of acoustic emission technique in engineering
|
A review of the application of acoustic emission technique in engineering
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Gholizadeh(Universiti Putra Malaysia); Z. Leman(Universiti Putra Malaysia); B.T.H.T. Baharudin(Universiti Putra Malaysia)"
] |
The use of acoustic emission (AE) technique for detecting and monitoring damages and the progress on damages in different structures is widely used and has earned a reputation as one of the most reliable and well-established technique in non-destructive testing (NDT). Acoustic Emission is a very efficient and effective technology used for fracture behavior and fatigue detection in metals, fiberglass, wood, composites, ceramics, concrete and plastics. It can also be used for detecting faults and pressure leaks in vessels, tanks, pipes, as well as for monitoring the progression of corrosion in welding. This paper reviews major research developments over the past few years in application of acoustic emission in numerous engineering fields, including manufacturing, civil, aerospace and material engineering.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001997228
|
oai_dc
|
Modified nonlinear force density method for form-finding of membrane SAR antenna
|
Modified nonlinear force density method for form-finding of membrane SAR antenna
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rui Xu(National University of Defense Technology); DongXu Li(National University of Defense Technology); Wang Liu(National University of Defense Technology); JianPing Jiang(National University of Defense Technology); YiHuan Liao(National University of Defense Technology); Jie Wang(National University of Defense Technology)"
] |
Form-finding for cable-membrane structures is a delicate operation. During the last decades, the force density method (FDM) was considered to be an efficient method to address the problem. Many researchers were devoted to improving this method and proposed many methods such as natural force density method (NFDM), improved nonlinear force density method (INFDM), et al. In this paper, a modified nonlinear force density method (MNFDM) is proposed. In this method, the stresses of membrane elements were transformed to the force-densities of cable nets by an equivalent relationship, and then they can be used as initial conditions. By comparing with the forming finding results by using the FDM, NFDM, INFDM and MNFDM, it had demonstrated that the MNFDM presented in this paper is the most efficient and precise.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001997236
|
oai_dc
|
On the fundamental period of infilled RC frame buildings
|
On the fundamental period of infilled RC frame buildings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Panagiotis G. Asteris(School of Pedagogical and Technological Education); Constantinos C. Repapis(Technological Education Institute of Piraeus); Liborio Cavaleri(University of Palermo); Vasilis Sarhosis(Cardiff University); Adamantia Athanasopoulou(School of Pedagogical and Technological Education)"
] |
This paper investigates the fundamental period of vibration of RC buildings by means of finite element macro-modelling and modal eigenvalue analysis. As a base study, a number of 14-storey RC buildings have been considered “according to code designed” and “according to code non-designed”. Several parameters have been studied including the number of spans; the span length in the direction of motion; the stiffness of the infills; the percentage openings of the infills and; the location of the soft storeys. The computed values of the fundamental period are compared against those obtained from seismic code and equations proposed by various researchers in the literature. From the analysis of the results it has been found that the span length, the stiffness of the infill wall panels and the location of the soft storeys are crucial parameters influencing the fundamental period of RC buildings.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001997239
|
oai_dc
|
A novel sensitivity method to structural damage estimation in bridges with moving mass
|
A novel sensitivity method to structural damage estimation in bridges with moving mass
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Akbar Mirzaee(Iran University of Science and Technology); Mohsenali Shayanfar(Iran University of Science and Technology); Reza Abbasnia(Iran University of Science and Technology)"
] |
In this research a theoretical and numerical study on a bridge damage detection procedure is presented based on vibration measurements collected from a set of accelerometers. This method, referred to as “Adjoint Variable Method”, is a sensitivity-based finite element model updating method. The approach relies on minimizing a penalty function, which usually consists of the errors between the measured quantities and the corresponding predictions attained from the model.
Moving mass is an interactive model and includes inertia effects between the model and mass. This interactive model is a time varying system and the proposed method is capable of detecting damage in this variable system.
Robustness of the proposed method is illustrated by correct detection of the location and extension of predetermined single, multiple and random damages in all ranges of speed and mass ratio of moving vehicle. A comparative study on common sensitivity and the proposed method confirms its efficiency and performance improvement in sensitivity-based damage detection methods.
In addition various possible sources of error, including the effects of measurement noise and initial assumption error in stability of method are also discussed.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001997230
|
oai_dc
|
Nonlinear vibration analysis of a nonlocal sinusoidal shear deformation carbon nanotube using differential quadrature method
|
Nonlinear vibration analysis of a nonlocal sinusoidal shear deformation carbon nanotube using differential quadrature method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hasan Rahimi Pour(Islamic Azad University); Hossein Vossough(Islamic Azad University); Mohammad Mehdi Heydari(Islamic Azad University); Gholamhossein Beygipoor(Islamic Azad University); Ali Azimzadeh(Islamic Azad University)"
] |
This paper presents a nonlocal sinusoidal shear deformation beam theory (SDBT) for the nonlinear vibration of single walled carbon nanotubes (CNTs). The present model is capable of capturing both small scale effect and transverse shear deformation effects of CNTs, and does not require shear correction factors. The surrounding elastic medium is simulated based on Pasternak foundation. Based on the nonlocal differential constitutive relations of Eringen, the equations of motion of the CNTs are derived using Hamilton’s principle. Differential quadrature method (DQM) for the natural frequency is presented for different boundary conditions, and the obtained results are compared with those predicted by the nonlocal Timoshenko beam theory (TBT). The effects of nonlocal parameter, boundary condition, aspect ratio on the frequency of CNTs are considered. The compar¬ison firmly establishes that the present beam theory can accurately predict the vibration responses of CNTs.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001997232
|
oai_dc
|
A novel harmony search based optimization of reinforced concrete biaxially loaded columns
|
A novel harmony search based optimization of reinforced concrete biaxially loaded columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sinan Melih Nigdeli(Istanbul University); Gebrail Bekdaş(Istanbul University); 김상훈(Temple University); 김종우(가천대학교)"
] |
A novel optimization approach for reinforced concrete (RC) biaxially loaded columns is proposed. Since there are several design constraints and influences, a new computation methodology using iterative analyses for several stages is proposed. In the proposed methodology random iterations are combined with music inspired metaheuristic algorithm called harmony search by modifying the classical rules of the employed algorithm for the problem. Differently from previous approaches, a detailed and practical optimum reinforcement design is done in addition to optimization of dimensions. The main objective of the optimization is the total material cost and the optimization is important for RC members since steel and concrete are very different materials in cost and properties. The methodology was applied for 12 cases of flexural moment combinations. Also, the optimum results are found by using 3 different axial forces for all cases. According to the results, the proposed method is effective to find a detailed optimum result with different number of bars and various sizes which can be only found by 2000 trial of an engineer. Thus, the cost economy is provided by using optimum bars with different sizes.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001997235
|
oai_dc
|
Dynamic analysis of deployable structures using independent displacement modes based on Moore-Penrose generalized inverse matrix
|
Dynamic analysis of deployable structures using independent displacement modes based on Moore-Penrose generalized inverse matrix
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ping Xiang(Waseda University); Minger Wu(Tongji University); Rui Q. Zhou(Shanghai Institute of Mechanical & Electrical Engineering Co., Ltd)"
] |
Deployable structures have gained more and more applications in space and civil structures, while it takes a large amount of computational resources to analyze this kind of multibody systems using common analysis methods. This paper presents a new approach for dynamic analysis of multibody systems consisting of both rigid bars and arbitrarily shaped rigid bodies. The bars and rigid bodies are connected through their nodes by ideal pin joints, which are usually fundamental components of deployable structures. Utilizing the Moore-Penrose generalized inverse matrix, equations of motion and constraint equations of the bars and rigid bodies are formulated with nodal Cartesian coordinates as unknowns. Based on the constraint equations, the nodal displacements are expressed as linear combination of the independent modes of the rigid body displacements, i.e., the null space orthogonal basis of the constraint matrix. The proposed method has less unknowns and a simple formulation compared with common multibody dynamic methods. An analysis program for the proposed method is developed, and its validity and efficiency are investigated by analyses of several representative numerical examples, where good accuracy and efficiency are demonstrated through comparison with commercial software package ADAMS.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001997237
|
oai_dc
|
Fracture energy and tension softening relation for nanomodified concrete
|
Fracture energy and tension softening relation for nanomodified concrete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Ramachandra Murthy(Structural Engineering Research Centre); P. Ganesh(Structural Engineering Research Centre); S. Sundar Kumar(Structural Engineering Research Centre); Nagesh R. Iyer(Structural Engineering Research Centre)"
] |
This paper presents the details of size independent fracture energy and bi-linear tension softening relation for nano modified high strength concrete. Nano silica in powder form has been used as partial replacement of cement by 2 wt%. Two popular methods, namely, simplified boundary effect method of Karihaloo et al. (2003) and RILEM (1985) fracture energy with P-δ tail correction have been employed for estimation of size independent fracture energy for nano modified high strength concrete (compressive strength ranges from 55 MPa to 72 MPa). It is found that both the methods gave nearly same values, which is an additional evidence that either of them can be employed for determination of size independent fracture energy. Bi-linear tension softening relation corresponding to their size independent fracture energy has been constructed in an inverse manner based on the concept of non-linear hinge from the load-crack mouth opening plots of notched three-point bend beams.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001997240
|
oai_dc
|
Experimental and numerical investigation of expanded metal tube absorber under axial impact loading
|
Experimental and numerical investigation of expanded metal tube absorber under axial impact loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Damghani Nouri(Semnan University); H. Hatami(Semnan University); A. Ghodsbin Jahromi(Semnan University)"
] |
In this research, the cylindrical absorber made of expanded metal sheets under impact loading has been examined. Expanded metal sheets due to their low weight, effective collapse mechanism has a high energy absorption capacity. Two types of absorbers with different cells angle were examined. First, the absorber with cell angle α=0 and then the absorber with angle cell α=90. Experimental Study is done by drop Hammer device and numerical investigation is done by finite element of ABAQUS software. The output of device is acceleration- time Diagram which is shown by Accelerometer that is located on the picky mass. Also the output of ABAQUS software is shown by force-displacement diagram. In this research, the numerical and experimental study of the collapse type, force-displacement diagrams and effective parameters has been investigated. Similarly, the comparison between numerical and experimental results has been observed that these results are matched well with each other. From the obtained results it was observed that the absorber with cell angle α=0, have symmetric collapse and had high energy absorption capacity but the absorber with cell angle α=90, had global buckling and the energy absorption value was not suitable.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001997242
|
oai_dc
|
Shear response of lean duplex stainless steel plate girders
|
Shear response of lean duplex stainless steel plate girders
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Salam R. Armoosh(Universiti Kebangsaan Malaysia); A.R. Khalim(Universiti Kebangsaan Malaysia); Akram Sh. Mahmood(University of Al-Anbar)"
] |
Carbon steel plate girders have been used on a large scale in the building industry. Nowadays, Lean Duplex Stainless Steel (LDSS) plate girders are gaining popularity as they possess greater strength and are more impervious to corrosion than those that are constructed from carbon steel. Regardless of their popularity, there is very limited information with regards to their shear behavior. In this paper, the non-linear finite element analysis was employed to investigate the shear behavior of LDSS plate girders. Parameters considered were the web thickness, the flange width, and the girders aspect ratio. The analysis revealed that although the shear behavior of the LDSS girders was no different from that of carbon steel plate girders, it had obviously been affected by the non-linearity of the material. Furthermore, the selected parameters were found to pronounce effect on the shear capacity of the LDSS girders. That is, the shear capacity increased considerably with web thickness, and increased slightly with flange width. However, it was reduced as the aspect ratio increased. Comparisons between the finite element analysis failure loads and those predicted by the current European Code of Practice revealed that the latter underestimated the shear strength of the LDSS plate girders.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001961584
|
oai_dc
|
Estimation of ultimate torque capacity of the SFRC beams using ANN
|
Estimation of ultimate torque capacity of the SFRC beams using ANN
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Serkan Engin(Kocaeli University); Onur Öztürk(Kocaeli University); Fuad Okay(Kocaeli University)"
] |
In this study, in order to propose an efficient model to predict the torque capacity of steel fiber reinforced concrete (SFRC) beams, the existing experimental data related to torsional response of beams is reviewed. It is observed that existing data neglects the effects of some parameters on the variation of torque capacity. Thus, an experimental research was also conducted to obtain the effects of neglected parameters. In the experimental study, a total of seventeen SFRC beams are tested against torsion. The parameters considered in the experiments are concrete compressive strength, steel fiber aspect ratio, volumetric ratio of steel fibers and longitudinal reinforcement ratio. The effect of each parameter is discussed in terms of torque versus unit angle of twist graphs. The data obtained from this experimental research is also combined withthe data got from previous studies and employed in artificial neural network (ANN) analysis to estimate the ultimate torque capacity of SFRC beams. In addition to parameters considered in the experiments, aspect ratio of beam cross-section, yield strengths of both transverse and longitudinal reinforcements, and transverse reinforcement ratio are also defined as parameters in ANN analysis due to their significant effects observed in previous studies. Assessment of the accuracy of ANN analysis in estimating the ultimate torque capacity of SFRC beams is performed by comparing the analytical and experimental results. Comparisons are conducted in terms of root mean square error (RMSE), mean absolute error (MAE) and coefficient of efficiency (Ef). The results of this study revealed that addition of steel fibers increases the ultimate torque capacity of reinforced concrete beams. It is also found that ANN is a powerful method and a feasible tool to estimate ultimate torque capacity of both normal and high strength concrete beams within the range of input parameters considered.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001961588
|
oai_dc
|
Seismic response of steel braced frames equipped with shape memory alloy-based hybrid devices
|
Seismic response of steel braced frames equipped with shape memory alloy-based hybrid devices
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Neda Salari(K. N. Toosi University of Technology); Behrouz Asgarian(K. N. Toosi University of Technology)"
] |
This paper highlights the role of innovative vibration control system based on two promising properties in a parallel configuration. Hybrid device consists of two main components; recentering wires of shape memory alloy (SMA) and steel pipe section as an energy dissipater element. This approach concentrates damage in the steel pipe and prevents the main structural members from yielding. By regulationof the main adjustable design parameter, an optimum performance of the device is obtained. The effectiveness of the device in passive control of structures is evaluated through nonlinear time history analyses of a five-story steel frame with and without the hybrid device. Comparing the results proves that the hybrid device has a considerable potential to mitigate the residual drift ratio, peak absolute acceleration and peak interstory drift of the structure.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001961572
|
oai_dc
|
Colliding bodies optimization for size and topology optimization of truss structures
|
Colliding bodies optimization for size and topology optimization of truss structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Kaveh(Iran University of Science and Technology); V.R. Mahdavi(Iran University of Science and Technology)"
] |
This paper presents the application of a recently developed meta-heuristic algorithm, called Colliding Bodies Optimization (CBO), for size and topology optimization of steel trusses. This method is based on the one-dimensional collisions between two bodies, where each agent solution is considered as a body. The performance of the proposed algorithm is investigated through four benchmark trusses for minimum weight with static and dynamic constraints. A comparison of the numerical results of the CBO with those of other available algorithms indicates that the proposed technique is capable of locatingpromising solutions using lesser or identical computational effort, with no need for internal parameter tuning.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001961585
|
oai_dc
|
Parameters affecting the seismic response of buildings under bi-directional excitation
|
Parameters affecting the seismic response of buildings under bi-directional excitation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ioanna - Kleoniki M. Fontara(Aristotle University of Thessaloniki); Konstantinos G. Kostinakis(Aristotle University of Thessaloniki); Grigorios E. Manoukas(Aristotle University of Thessaloniki); Asimina M. Athanatopoulou(Aristotle University of Thessaloniki)"
] |
The present paper investigates the influence of the orientation of the ground-motion reference axes, the seismic incident angle and the seismic intensity level on the inelastic response of asymmetric reinforced concrete buildings. A single storey asymmetric building is analyzed by nonlinear dynamic analyses under twenty bi-directional ground motions. The analyses are performed for many angles of incidence and four seismic intensity levels. Moreover three different pairs of the horizontal accelerogramscorresponding to the input seismic motion are considered: a) the recorded accelerograms, b) the corresponding uncorrelated accelerograms, and c) the completely correlated accelerograms. The nonlinear response is evaluated by the overall structural damage index. The results of this study demonstrate that the inelastic seismic response depends on the orientation of the ground-motion reference axes, since the three individual pairs of accelerograms corresponding to the same ground motion (recorded, uncorrelated and completely correlated) can cause different structural damage level for the same incident angle. Furthermore, the use of the recorded accelerograms as seismic input does not always lead to the critical case of study. It is also shown that there is not a particular seismic incident angle or range of angles that leads to the maximum values of damage index regardless of the seismic intensity level or the ground-motion reference axes.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001961576
|
oai_dc
|
Effect of laser shock peening and cold expansion on fatigue performance of open hole samples
|
Effect of laser shock peening and cold expansion on fatigue performance of open hole samples
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Carlos Rubio-Gonzalez(Centro de Ingeniería y Desarrollo Industrial); G. Gomez-Rosas(Universidad de Guadalajara); R. Ruiz(Instituto Tecnológico de Morelia); M. Nait(IUT A GMP); A. Amrouche(LGCgE)"
] |
Mechanical fastening is still one of the main methods used for joining components. Different techniques have been applied to reduce the effect of stress concentration of notches like fastener holes. Inthis work we evaluate the feasibility of combining laser shock peening (LSP) and cold expansion to improve fatigue crack initiation and propagation of open hole specimens made of 6061-T6 aluminum alloy. LSP is a new and competitive technique for strengthening metals, and like cold expansion, induces a compressive residual stress field that improves fatigue, wear and corrosion resistance. For LSP treatment, a Q-switched Nd:YAG laser with infrared radiation was used. Residual stress distribution as a function of depth was determined by the contour method. Compact tension specimens with a hole at the notch tip were subjected to LSP process and cold expansion and then tested under cyclic loading with R=0.1 generating fatigue cracks on the hole surface. Fatigue crack initiation and growth is analyzed and associated with the residual stress distribution generated by both treatments. It is observed that both methods are complementary; cold expansion increases fatigue crack initiation life, while LSP reduces fatigue crack growth rate.
|
토목공학
| null |
kci_detailed_000065.xml
|
|||
ART001961582
|
oai_dc
|
Multi-point response spectrum analysis of a historical bridge to blast ground motion
|
Multi-point response spectrum analysis of a historical bridge to blast ground motion
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kemal Hacıefendioğlu(Ondokuz Mayıs University); Swagata Banerjee(The Pennsylvania State University); Kurtuluş Soyluk(Gazi University); Olgun Köksal(Ondokuz Mayıs University)"
] |
In this study, the effects of ground shocks due to explosive loads on the dynamic response of historical masonry bridges are investigated by using the multi-point shock response spectrum method. With this purpose, different charge weights and distances from the charge center are considered for the analyses of a masonry bridge and depending on these parameters frequency-varying shock spectra are determined and applied to each support of the two-span masonry bridge. The net blast induced ground motion consists of air-induced and direct-induced ground motions. Acceleration time histories of blast induced ground motions are obtained depending on a deterministic shape function and a stationary process. Shock response spectrums determined from the ground shock time histories are simulated using BlastGM software. The results obtained from uniform and multi-point response spectrum analyses cases show that significant differences take place between the uniform and multi-point blast-induced ground motions.
|
토목공학
| null |
kci_detailed_000065.xml
|
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