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ART001769912
|
oai_dc
|
Analytical solution for nonlinear vibration of an eccentrically reinforced cylindrical shell
|
Analytical solution for nonlinear vibration of an eccentrically reinforced cylindrical shell
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mahmoud Bayat(Islamic Azad University); Iman Pakar(Islamic Azad University); Mahdi Bayat(Islamic Azad University)"
] |
In this study we have considered the governing nonlinear equation of an eccentrically reinforced cylindrical shell. A new analytical method called He’s Variational Approach (VA) is used to obtain the natural frequency of the nonlinear equation. This analytical representation gives excellent approximations to the numerical solution for the whole range of the oscillation amplitude, reducing the respective error of angular frequency in comparison with the variation approach method. It has been proved that the variational approach is very effective, convenient and does not require any linearization or small perturbation. Additionally it has been demonstrated that the variational approach is adequately accurate to nonlinear problems in physics and engineering.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001769903
|
oai_dc
|
Non-linear analyses model for composite box-girders with corrugated steel webs under torsion
|
Non-linear analyses model for composite box-girders with corrugated steel webs under torsion
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"고희중(고려대학교); 문지호(고려대학교); 신용우(대우건설); 이학은(고려대학교)"
] |
A composite box-girder with corrugated steel webs has been used in civil engineering practice as an alternative to the conventional pre-stressed concrete box-girder because of several advantages, such as high shear resistance without vertical stiffeners and an increase in the efficiency of pre-stressing due to the accordion effect. Many studies have been conducted on the shear buckling and flexural behavior of the composite box-girder with corrugated steel webs. However, the torsional behavior is not fully understood yet, and it needed to be investigated. Prior study of the torsion of the composite box-girder with corrugated steel webs has been developed by assuming that the concrete section is cracked prior to loading and doesn’t have tensile resistance. This results in poor estimation of pre-cracking behaviors, such as initial stiffness. To overcome this disadvantage of the previous analytical model, an improved analytical model for torsion of the composite box-girder with corrugated steel webs was developed considering the concrete tension behavior in this study. Based on the proposed analytical model, a non-linear torsional analysis program for torsion of the composite box-girder with corrugated steel webs was developed and successfully verified by comparing with the results of the test. The proposed analytical model shows that the concrete tension behavior has significant effect on the initial torsional stiffness and cracking torsional moment. Finally, a simplified torsional moment-twist angle relationship of the composite box-girder with corrugated steel webs was proposed based on the proposed analytical model.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001769909
|
oai_dc
|
Compressive performance with variation of yield strength and width-thickness ratio for steel plate-concrete wall structures
|
Compressive performance with variation of yield strength and width-thickness ratio for steel plate-concrete wall structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"최병정(경기대학교); 강철규(경기대학교); 김원기(호서대학교); 김우범(공주대학교)"
] |
The primary objectives of this paper are to describe the buckling patterns and to determine the squash load of steel plate-concrete (SC) walls. The major variables in this study were the width-thickness (B/t) ratio and yield strength of surface steel plates. Six SC walls were tested, and the results include the maximum strength, buckling pattern of steel plates, strength of headed studs, and behavior of headed studs. Based on the test results, the effects of the B/t ratio on the compressive strength are also discussed. The paper also presents recommended effective length coefficients and discusses the effects of varying the yield strength of the steel plate, and the effects of headed studs on the performance of SC structures based on the test results and analysis.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001769910
|
oai_dc
|
Ultimate behavior of composite beams with shallow I-sections
|
Ultimate behavior of composite beams with shallow I-sections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Selçuk Emre Görkem(Erciyes University); Metin Hüsem(Karadeniz Technical University)"
] |
Bending behavior of reinforced concrete slabs encased over shallow I-sections at different levels of compression heads were investigated in present study. 1500 mm long I-sections were used to create composite slabs. Compression heads of monolithic experimental members were encased at different levels into the concrete slabs. Shear connections were welded over some of the I-sections. The testing was carried out in accordance with the principles of four-point loading. Results revealed decreasing load bearing and deflection capacities of composite beams with increasing encasement depths into concrete. Mechanical properties of concrete and reinforcing steel were also examined. Resultant stresses calculated for composite beams at failure were found to be less than the yield strength of steel beams. Test results were discussed with regard to shear and slip effect.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001769906
|
oai_dc
|
Structural behavior of CFRP strengthened concrete-filled steel tubes columns under axial compression loads
|
Structural behavior of CFRP strengthened concrete-filled steel tubes columns under axial compression loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"박재우(가윤건설); 최성모(서울시립대학교)"
] |
This paper presents the structural behavior of CFRP (carbon fiber reinforced polymer) strengthened CFT (concrete-filled steel tubes) columns under axial loads. Circular and square specimens were selected to investigate the retrofitting effects of CFRP sheet on CFT columns. Test parameters are cross section of CFT, D/t (B/t) ratios, and the number of CFRP layers. The load and ductility capacities were evaluated for each specimen. Structural behavior comparisons of circular and rectangular section will be represented in the experimental result discussion section. Finally, ultimate load formula of CFRP strengthened CFT will be proposed to calculate the ultimate strength of CFRP strengthened circular CFT. The prediction values are in good agreement with the test results obtained in this study and in the literature.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001745334
|
oai_dc
|
Flexural behavior of cold-formed steel concrete composite beams
|
Flexural behavior of cold-formed steel concrete composite beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"T. Valsa Ipe(MSRIT Bangalore); H. Sharada Bai(UVCE Bangalore); K. Manjula Vani(JNTUH Hyderabad); Merchant Mohd Zafar Iqbal(MSRIT)"
] |
Flexural behavior of thin walled steel-concrete composite sections as cross sections for beams is investigated by conducting an experimental study supported by applicable analytical predictions. The experimental study consists of testing up to failure, simply supported beams of effective span 1440 mm under two point loading. The test specimens consisted of composite box and channel (with lip placed on tension side and compression side) sections, the behavior of which was compared with companion empty sections. To understand the role of shear connectors in developing the composite action, some of the composite sections were provided with novel simple bar type and conventional bolt type shear connectors in the shear zone of beams. Two RCC beams having equivalent ultimate moment carrying capacities as that of composite channel and box sections were also considered in the study. The study showed that the strength to weight ratio of composite beams is much higher than RCC beams and ductility index is also more than RCC and empty beams. The analytical predictions were found to compare fairly well with the experimental results, thereby validating the applicability of rigid plastic theory to cold-formed steel concrete composite beams.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001745335
|
oai_dc
|
Multiobjective optimum design of laminated composite annular sector plates
|
Multiobjective optimum design of laminated composite annular sector plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Umut Topal(Karadeniz Technical University)"
] |
This paper deals with multiobjective optimization of symmetrically laminated composite angleply annular sector plates subjected to axial uniform pressure load and thermal load. The design objective is the maximization of the weighted sum of the critical buckling load and fundamental frequency. The design variable is the fibre orientations in the layers. The performance index is formulated as the weighted sum of individual objectives in order to obtain the optimum solutions of the design problem. The first-order shear deformation theory is used for the mathematical formulation. Finally, the effects of different weighting factors, annularity, sector angle and boundary conditions on the optimal design are investigated and the results are compared.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001746076
|
oai_dc
|
Seismic Performance of Wind-Designed Diagrid Tall Steel Buildings in Regions of Moderate Seismicity and Strong Wind
|
Seismic Performance of Wind-Designed Diagrid Tall Steel Buildings in Regions of Moderate Seismicity and Strong Wind
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김선웅(대우건설); 이경구(단국대학교)"
] |
This study analytically evaluated the seismic performance of wind-designed diagrid tall steel buildings in regions of moderate/low seismicity and strong winds. To this end, diagrid tall steel buildings with varying wind exposure and slenderness ratio (building height-to-width ratio) conditions were designed to satisfy the wind serviceability criteria specified in the Korean Building Code and the National Building Code of Canada. A series of seismic analyses were then performed for earthquakes having 43- and 2475-year return periods utilizing the design guidelines of tall buildings. The analyses demonstrated the good seismic performance of these wind-designed diagrid tall steel buildings, which arises because significant overstrength of the diagrid system occurs in the wind design procedure. Also, analysis showed that the elastic seismic design process of diagrid tall steel buildings might be accepted based on some wind exposures and slenderness ratios.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001746086
|
oai_dc
|
Behavior of circular CFT columns subject to axial force and bending moment
|
Behavior of circular CFT columns subject to axial force and bending moment
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"곽지현(산업과학연구원); 곽효경(산업과학연구원); 김진국(한국과학기술원)"
] |
The major objective of this paper is to evaluate the behavior and ultimate resisting capacity of circular CFT columns. To consider the confinement effect, proper material models with respect to the confinement pressure are selected. A fiber section approach is adopted to simulate the nonlinear stress distribution along the section depth. Material nonlinearity due to the cracking of concrete and the yielding of the surrounding steel tube, as well as geometric nonlinearity due to the P-Δ effect, are taken into account. The validity of the proposed numerical analysis model is established by comparing the analytical predictions with the results from previous experimental studies about pure bending and eccentric axial loading. Numerical predictions using an unconfined material model were also compared to investigate the confinement effects on various loading combinations. The ultimate resisting capacities predicted by the proposed numerical model and the design guidelines in Eurocode 4 are compared to evaluate the existing design recommendation.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001746075
|
oai_dc
|
Experimental and analytical investigation of high-strength concrete-filled steel tube square columns subjected to flexural loading
|
Experimental and analytical investigation of high-strength concrete-filled steel tube square columns subjected to flexural loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"유정한(RIST); Kyung-Soo Chung(Seoul National University); Jin-Ho Kim(RIST)"
] |
The concrete-filled steel tube (CFT) columns have several benefits of high load-bearing capacity, inherent ductility and toughness because of the confinement effect of the steel tube on concrete and the restraining effect of the concrete on local buckling of steel tube. However, the experimental research into the behavior of square CFT columns consisting of high-strength steel and high-strength concrete is limited. Six full scale CFT specimens were tested under flexural moment. The CFT columns consisted of high-strength steel tubes (fy = 325 MPa, 555 MPa, 900 MPa) and high-strength concrete (fck = 80 MPa and 120 MPa). The ultimate capacity of high strength square CFT columns was compared with AISC-LRFD design code. Also,this study was focused on investigating the effect of high-strength materials on the structural behavior and the mathematical models of the steel tube and concrete. Nonlinear fiber element analyses were conducted based on the material model considering the cyclic bending behavior of high-strength CFT members. The results obtained from the numerical analyses were compared with the experimental results. It was found that the numerical analysis results agree well with the experimental results.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001746089
|
oai_dc
|
Behavior of Hybrid Double Skin Concrete Filled Circular Steel Tube Columns
|
Behavior of Hybrid Double Skin Concrete Filled Circular Steel Tube Columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김진국((재)포항산업과학연구원); 곽효경(한국과학기술원); 곽지현(한국과학기술원)"
] |
A hybrid double skin concrete filled (HDSCF) circular steel tube column is proposed in this study. The yield strength of the outer steel tube is larger than 690MPa and the inner tube has less strength. In order to achieve efficiency with the high strength outer tube, a feasibility study on reducing the thickness of the tube below the specified design codes for CFTs was conducted based on an experimental approach. The experiment also took variables such as thickness of the inner tube, hollow ratio, and strength of concrete into consideration to investigate the behavior of the HDSCF column. In order to estimate the applicability of design equations for CFTs to the HDSCF column, test results from CFT and HDSCF columns with design codes were compared. It was found that the axial compressive performance of the proposed HDSCF column is equivalent to that of the conventional CFT member irrespective of design variables. Furthermore, the design equation for a circular CFT given by EC4 is applicable to estimate the ultimate strength of the HDSCF circular steel tube column.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001789619
|
oai_dc
|
Dynamic stability analysis of laminated composite plates in thermal environments
|
Dynamic stability analysis of laminated composite plates in thermal environments
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chun-Sheng Chen(Lunghwa University of Science and Technology); Wei-Ren Chen(Chinese Culture University); Ting-Chiang Tsai(National Taipei University of Technology); Ching-Long Wei(Lunghwa University of Science and Technology); 이재홍(세종대학교); 전찬기(인천대학교)"
] |
This paper studies the dynamic instability of laminated composite plates under thermal and arbitrary in-plane periodic loads using first-order shear deformation plate theory. The governing partial differential equations of motion are established by a perturbation technique. Then, the Galerkin method is applied to reduce the partial differential equations to ordinary differential equations. Based on Bolotin's method, the system equations of Mathieu-type are formulated and used to determine dynamic instability regions of laminated plates in the thermal environment. The effects of temperature, layer number, modulus ratio and load parameters on the dynamic instability of laminated plates are investigated. The results reveal that static and dynamic load, layer number, modulus ratio and uniform temperature rise have a significant influence on the thermal dynamic behavior of laminated plates.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001789617
|
oai_dc
|
Probabilistic sensitivity analysis of suspension bridges to near-fault ground motion
|
Probabilistic sensitivity analysis of suspension bridges to near-fault ground motion
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Özlem Çavdar(Gumushane University)"
] |
The sensitivities of a structural response due to variation of its design parameters are prerequisite in the majority of the algorithms used for fundamental problems in engineering as system uncertainties, identification and probabilistic assessments etc. The paper presents the concept of probabilistic sensitivity of suspension bridges with respect to near-fault ground motion. In near field earthquake ground motions, large amplitude spectral accelerations can occur at long periods where many suspension bridges have significant structural response modes. Two different types of suspension bridges, which are Bosporus and Humber bridges, are selected to investigate the near-fault ground motion effects on suspension bridges random response sensitivity analysis. The modulus of elasticity is selected as random design variable. Strong ground motion records of Kocaeli, Northridge and Erzincan earthquakes are selected for the analyses. The stochastic sensitivity displacements and internal forces are determined by using the stochastic sensitivity finite element method and Monte Carlo simulation method. The stochastic sensitivity displacements and responses obtained from the two different suspension bridges subjected to these near-fault strong-ground motions are compared with each other. It is seen from the results that near-fault ground motions have different impacts stochastic sensitivity responses of suspension bridges. The stochastic sensitivity information provides a deeper insight into the structural design and it can be used as a basis for decision-making.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001789616
|
oai_dc
|
Temperature on structural steelworks insulated by inorganic intumescent coating
|
Temperature on structural steelworks insulated by inorganic intumescent coating
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J. Yoon Choi(한국건설생활환경시험연구원); 최승관(Univ. of Ulster)"
] |
Predicting the fire resistance of structures has been significantly advanced by full scale fire tests in conjunction with improved understanding of compartmental fire. Despite the progress, application of insulation is still required to parts of structural steelwork to achieve over 60 minutes of fire rating. It is now recognised that uncertainties on insulation properties hinder adaptation of performance based designs for different types of structures. Intumescent coating has recently appeared to be one of most popular insulation types for steel structures, but its design method remains to be confirmed by empirical data, as technical difficulties on the determination of the material properties at elevated temperatures exist. These need to take into account of further physiochemical transitions such as moving boundary and endothermic reaction. The impetus for this research is to investigate the applicability of the conventional differential equation solution which examines the temperature rise on coated steel members by an inorganic intumescent coating, provided that the temperature.dependent thermal/mechanical insulation properties are experimentally defined in lab scale tests.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001789620
|
oai_dc
|
Analysis of end-plate connections at elevated temperatures
|
Analysis of end-plate connections at elevated temperatures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shuyuan Lin(Brunel University); Zhaohui Huang(Brunel University); Mizi Fan(Brunel University)"
] |
In this paper a robust 2-noded connection element has been developed for modelling the bolted end-plate connection between steel beam and column at elevated temperatures. The numerical procedure described is based on the model proposed by Huang (2011), incorporating additional developments to more precisely determinate the tension, compression and bending moment capacities of end-plate connection in fire. The proper failure criteria are proposed to calculate the tension capacity for each individual bolt row. In this new model the connection failure due to bending, axial tension, compression and shear are considered. The influence of the axial force of the connected beam on the connection is also taken into account. This new model has the advantages of both the simple and component-based models. In order to validate the model a total of 22 tests are used. It is evident that this new connection model has ability to accurately predict the behaviour of the end-plate connection at elevated temperatures, and can be used to represent the end-plate connections in supporting performance-based fire resistance design of steel-framed composite buildings.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001789618
|
oai_dc
|
Analysis of concrete-filled steel tubular columns with “T” shaped cross section (CFTTS)
|
Analysis of concrete-filled steel tubular columns with “T” shaped cross section (CFTTS)
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Qin-Ting Wang(Henan Polytechnic University); Xu Chang(Henan Polytechnic University)"
] |
This paper presents a numerical study of axially loaded concrete-filled steel tubular columnswith “T” shaped cross section (CFTTS) based on the ABAQUS standard solver. Two types of columns with“T” shaped cross section, the common concrete-filled steel tubular columns with “T” shaped cross section(CCFTTS) and the double concrete-filled steel tubular columns with “T” shaped cross section (DCFTTS),are discussed. The failure modes, confining effects and load-displacement curves are analyzed. Thenumerical results indicate that both have the similar failure mode that the steel tubes are only outwardbuckling on all columns’ faces. It is found that DCFTTS columns have higher axial capacities than CCFTTSones duo to the steel tube of DCFTTS columns can plays more significant confining effect on concrete. Aparametric study, including influence of tube thickness, concrete strength and friction coefficient oftube-concrete interface on the axial capacities is also carried out. Simplified formulae were also proposedbased on this study.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001789621
|
oai_dc
|
An experimental study on fire resistance of medical modular block
|
An experimental study on fire resistance of medical modular block
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김형준(한국건설기술연구원); 조봉호(아주대학교); 이재승(한남대학교); 김흥열(한국건설기술연구원); Yunping Xi(University of Colorado); 권기혁(서울시립대학교)"
] |
Fire performance and fire safety of high-rise buildings have become major concerns after thedisasters of World Trade Center in the U.S. in 2001 and Windsor tower in Spain in 2005. Performance baseddesign (PBD) approaches have been considered as a better method for fire resistance design of structuresbecause it is capable of incorporating test results of most recent fire resistance technologies. However, thereis a difficulty to evaluate fireproof performance of large structures, which have multiple structural memberssuch as columns, slabs, and walls. The difficulty is mainly due to the limitation in the testing equipment,such as size of furnace that can be used to carry out fire tests with existing criteria like ISO 834, BS 476, andKS F 2257. In the present research, a large scale calorie meter (10 MW) was used to conduct three full scalefire tests on medical modular blocks. Average fire load of 13.99 kg/m² was used in the first test. In thesecond test, the weighting coefficient of 3.5 (the fire load of 50 kg/ m²) was used to simulate the worst firescenario. The flashover of the medical modular block occurred at 62 minutes in the first test and 12 minutesin the second test. The heat resistance capacity of the external wall, the temperatures and deformations of thestructural members satisfied the requirements of fire resistance performance of 90 minutes burning period.
The total heat loads and the heat values for each test are calculated by theoretical equations. The duration ofburning was predicted. The predicted results were compared with the test results, and they agree quite well.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001803033
|
oai_dc
|
Seismic responses of composite bridge piers with CFT columns embedded inside
|
Seismic responses of composite bridge piers with CFT columns embedded inside
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wenliang Qiu(Dalian University of Technology); Meng Jiang(Dalian University of Technology); Shengshan Pan(Dalian University of Technology); Zhe Zhang(Dalian University of Technology)"
] |
Shear failure and core concrete crushing at plastic hinge region are the two main failure modes of bridge piers, which can make repair impossible and cause the collapse of bridge. To avoid the two types of failure of pier, a composite pier was proposed, which was formed by embedding high strength concrete filled steel tubular (CFT) column in reinforced concrete (RC) pier. Through cyclic loading tests, the seismic performances of the composite pier were studied. The experimental results show that the CFT column embedded in composite pier can increase the flexural strength, displacement ductility and energy dissipation capacity, and decrease the residual displacement after undergoing large deformation. The analytical analysis is performed to simulate the hysteretic behavior of the composite pier subjected to cyclic loading, and the numerical results agree well with the experimental results. Using the analytical model and history method, seismic responses of a continuous girder bridge using composite piers is investigated, and the results show that the bridge using composite piers can resist much stronger earthquake than the bridge using RC piers.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001803030
|
oai_dc
|
3D finite element modelling of composite connection of RCS frame subjected to cyclic loading
|
3D finite element modelling of composite connection of RCS frame subjected to cyclic loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Hossein Habashizadeh Asl(Sahand University of Technology); Mohammad Reza Chenaglou(Sahand University of Technology); Karim Abedi(Sahand University of Technology); Hassan Afshin(Sahand University of Technology)"
] |
Composite special moment frame is one of the systems that are utilized in areas with low to high seismicity to deal with earthquake forces. Composite moment frames are composed of reinforced concrete columns (RC) and steel beams (S); therefore, the connection region is a combination of steel and concrete materials. In current study, a three dimensional finite element model of composite connections is developed. These connections are used in special composite moment frame, between reinforced concrete columns and steel beams (RCS). Finite element model is discussed as a most reliable and low cost method versus experimental procedures. Based on a tested connection model by Cheng and Chen (2005), the finite element model has been developed under cyclic loading and is verified with experimental results. A good agreement between finite element model and experimental results was observed. The connection configuration contains Face Bearing Plates (FBPs), Steel Band Plates (SBPs) enveloping around the RC column just above and below the steel beam. Longitudinal column bars pass through the connection with square ties around them. The finite element model represented a stable response up to the first cycles equal to 4.0% drift, with moderately pinched hysteresis loops and then showed a significant buckling in upper flange of beam, as the in test model.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001803032
|
oai_dc
|
Influence of steel-concrete interaction in dissipative zones of frames: II - Numerical study
|
Influence of steel-concrete interaction in dissipative zones of frames: II - Numerical study
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gelu Danku(The “Politehnica” University); Dan Dubina(The “Politehnica” University); Adrian Ciutina(The “Politehnica” University)"
] |
In the case of seismic-resistant composite dual moment resisting and eccentrically braced frames, the current design practice is to avoid the disposition of shear connectors in the expected plastic zones, and consequently to consider a symmetric moment or shear plastic hinges, which occur only in the steel beam or link. Even without connectors, the real behavior of the hinge may be different from the symmetric assumption since the reinforced concrete slab is connected to the steel element close to the hinge locations, and also due to contact friction between the concrete slab and the steel element. At a larger level, the structural response in the case of important seismic motions depends directly on the elasto-plastic behavior of elements and hinges. The numerical investigation presented in this study summarizes the results of elasto-plastic analyses of several steel frames, considering the interaction of the steel beam with the concrete slab. Several parameters, such as the inter-story drift, plastic rotation requirements and behavior factors q were monitored. In order to obtain accurate results, adequate models of plastic hinges are proposed for both the composite short link and composite reduced beam sections.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001803031
|
oai_dc
|
Influence of steel-concrete interaction in dissipative zones of frames: I – Experimental study
|
Influence of steel-concrete interaction in dissipative zones of frames: I – Experimental study
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Adrian Ciutina(The “Politehnica” University); Dan Dubina(The “Politehnica” University); Gelu Danku(The “Politehnica” University)"
] |
In the case of seismic-resistant composite dual moment resisting and eccentrically braced frames, the current design practice is to avoid the disposition of shear connectors in the expected plastic zones, and consequently to consider a symmetric moment or shear plastic hinges, which occur only in the steel beam or link. Even without connectors, the real behaviour of the hinge may be different from the symmetric assumption, since the reinforced concrete slab is connected to the steel element close to the hinge locations, and also due to contact friction between the concrete slab and the steel element. The paper presents the results and conclusions of experimental tests on composite portal eccentrically braced frames and beam-to-column moment-resisting joints, carried out within the CEMSIG Research Centre of the Politehnica University of Timisoara, in order to check the validity of the assumption stated above. Reference steel and composite specimens with and without connectors in the plastic zones have been tested under monotonic and cyclic seismic type loading.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001803028
|
oai_dc
|
The behaviour of structures under fire – numerical model with experimental verification
|
The behaviour of structures under fire – numerical model with experimental verification
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Neno Torić(University of Split); Alen Harapin(University of Split); Ivica Boko(University of Split)"
] |
This paper presents a comparison of results obtained by a newly developed numerical model for predicting the behaviour of structures under fire with experimental study carried out on heated and simply supported steel beam elements. A newly developed numerical model consists of three submodels: 3D beam model designed for calculating the inner forces in the structure, 2D model designed for calculation of stress and strain distribution over the cross section, including the section stiffness, and 3D transient nonlinear heat transfer model that is capable of calculating the temperature distribution along the structure, and the distribution over the cross section as well. Predictions of the calculated temperatures and vertical deflections obtained by the numerical model are compared with the results of the inhouse experiment in which steel beam element under load was heated for 90 minutes.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001803029
|
oai_dc
|
On the fabrication of carbon fabric reinforced epoxy composite shell without joints and wrinkling
|
On the fabrication of carbon fabric reinforced epoxy composite shell without joints and wrinkling
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Vasanthanathan(MEPCO SCHLENK Engineering College); P. Nagaraj(MEPCO SCHLENK Engineering College); B. Muruganantham(COSMOPLAST)"
] |
This article describes a simple and cost effective fabrication procedure by using hand lay-up technique that is employed for the manufacturing of thin-walled axi-symmetric composite shell structures with carbon, glass and hybrid woven fabric composite materials. The hand lay-up technique is very commonly used in aerospace and marine industries for making the complicated shell structures. A generic fabrication procedure is presented in this paper aimed at manufacture of plain Carbon Fabric Reinforced Plastic (CFRP) and Glass Fabric Reinforced Plastic (GFRP) shells using hand lay-up process. This paper delivers a technical breakthrough in fabrication of composite shell structures without any joints and wrinkling. The manufacture of stiffened CFRP shells, laminated CFRP shells and hybrid (carbon / glass / epoxy) composite shells which are valued by the aerospace industry for their high strength-to-weight ratio under axial loading have also been addressed in this paper. A fabrication process document which describes the major processing steps of the composite shell manufacturing process has been presented in this paper. A study of microstructure of the glass fabric/epoxy composite, carbon fabric/epoxy composite and hybrid carbon/glass/fabric epoxy composites using Scanning Electron Microscope (SEM) has been also carried out in this paper.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001818851
|
oai_dc
|
Modelling aspects of the seismic response of steel concentric braced frames
|
Modelling aspects of the seismic response of steel concentric braced frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. D’Aniello(University of Naples “Federico II”); G. La Manna Ambrosino(University of Naples “Federico II”); F. Portioli(University of Naples “Federico II”); R. Landolfo(University of Naples “Federico II”)"
] |
This paper summarises the results of a numerical study on the non linear response of steel concentric braced frames under monotonic and cyclic loads, using force-based finite elements with section fibre discretisation. The first part of the study is addressed to analyse the single brace response. A parametric analysis was carried out and discussed to evaluate the accuracy of the model, examining the influence of the initial camber, the material modelling, the type of force-based element, the number of integration points and the number of fibers. The second part of the paper is concerned with the modelling issues of whole braced structures. The effectiveness of the modelling approach is verified against the nonlinear static and dynamic behaviour of different type of bracing configurations. The model sensitivity to brace-to-brace interaction and the capability of the model to mimic the response of complex bracing systems is analyzed. The influence of different approaches for modelling the inertia, the equivalent viscous damping and the brace hysteretic response on the overall structural response are also investigated. Finally, on the basis of the performed numerical study general modelling recommendations are proposed.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001818849
|
oai_dc
|
Cyclic testing of weak-axis steel moment connections
|
Cyclic testing of weak-axis steel moment connections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이강민(충남대학교); Rui Li(충남대학교); 정희택(3D엔지니어링); Liuyi Chen(충남대학교); 오경환(삼성물산(주))"
] |
The seismic performance of six types of weak-axis steel moment connections was investigated through cyclic testing of six full-scale specimens. These weak-axis moment connections were the column-tree type, WUF-B type, FF-W type, WFP type, BFP-B type and DST type weak-axis connections. The testing results showed that each of these weak-axis connection types achieved excellent seismic performance, except the WFP and the WUF-B types. The WFP and WUF-B connections displayed poor seismic performance because a fracture appeared prematurely at the weld joint due to stress concentrations. The column-tree type connection showed the best seismic behavior such that the story drift ratio could reach 5%.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001818850
|
oai_dc
|
An efficient genetic algorithm for the design optimization of cold-formed steel portal frame buildings
|
An efficient genetic algorithm for the design optimization of cold-formed steel portal frame buildings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"D.T. Phan(Universiti Tunku Abdul Rahman); J.B.P. Lim(Queen’s University Belfast); T.T. Tanyimboh(University of Strathclyde); W. Sha(Queen’s University Belfast)"
] |
The design optimization of a cold-formed steel portal frame building is considered in this paper. The proposed genetic algorithm (GA) optimizer considers both topology (i.e., frame spacing and pitch) and cross-sectional sizes of the main structural members as the decision variables. Previous GAs in the literature were characterized by poor convergence, including slow progress, that usually results in excessive computation times and/or frequent failure to achieve an optimal or near-optimal solution. This is the main issue addressed in this paper. In an effort to improve the performance of the conventional GA, a niching strategy is presented that is shown to be an effective means of enhancing the dissimilarity of the solutions in each generation of the GA. Thus, population diversity is maintained and premature convergence is reduced significantly. Through benchmark examples, it is shown that the efficient GA proposed generates optimal solutions more consistently. A parametric study was carried out, and the results included. They show significant variation in the optimal topology in terms of pitch and frame spacing for a range of typical column heights. They also show that the optimized design achieved large savings based on the cost of the main structural elements; the inclusion of knee braces at the eaves yield further savings in cost, that are significant.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001818848
|
oai_dc
|
Thermal post-buckling analysis of functionally graded beams with temperature-dependent physical properties
|
Thermal post-buckling analysis of functionally graded beams with temperature-dependent physical properties
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Turgut KOCATÜRK(Yıldız Technical University); Şeref Doğuşcan AKBAŞ(Yıldız Technical University)"
] |
This paper focuses on thermal post-buckling analysis of functionally graded beams with temperature dependent physical properties by using the total Lagrangian Timoshenko beam element approximation. Material properties of the beam change in the thickness direction according to a power-law function. The beam is clamped at both ends. In the case of beams with immovable ends, temperature rise causes compressible forces and therefore buckling and post-buckling phenomena occurs. It is known that post-buckling problems are geometrically nonlinear problems. Also, the material properties (Young's modulus, coefficient of thermal expansion, yield stress) are temperature dependent: That is the coefficients of the governing equations are not constant in this study. This situation suggests the physical nonlinearity of the problem. Hence, the considered problem is both geometrically and physically nonlinear. The considered highly non-linear problem is solved considering full geometric non-linearity by using incremental displacement-based finite element method in conjunction with Newton-Raphson iteration method. In this study, the differences between temperature dependent and independent physical properties are investigated for functionally graded beams in detail in post-buckling case. With the effects of material gradient property and thermal load, the relationships between deflections, critical buckling temperature and maximum stresses of the beams are illustrated in detail in post-buckling case.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001818847
|
oai_dc
|
A new first shear deformation beam theory based on neutral surface position for functionally graded beams
|
A new first shear deformation beam theory based on neutral surface position for functionally graded beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammed Bouremana(Université de Sidi Bel Abbes); Abdelouahed Tounsi(Université Sidi Bel Abbes); Mohammed Sid Ahmed Houari(Université de Mascara); Abdelhakim Kaci(Université de Sidi Bel Abbes); El Abbas Adda Bedia(Université de Sidi Bel Abbes)"
] |
In this paper, a new first-order shear deformation beam theory based on neutral surface position is developed for bending and free vibration analysis of functionally graded beams. The proposed theory is based on assumption that the in-plane and transverse displacements consist of bending and shear components, in which the bending components do not contribute toward shear forces and, likewise, the shear components do not contribute toward bending moments. The neutral surface position for a functionally graded beam which its material properties vary in the thickness direction is determined. Based on the present new first-order shear deformation beam theory and the neutral surface concept together with Hamilton's principle, the motion equations are derived. To examine accuracy of the present formulation, several comparison studies are investigated. Furthermore, the effects of different parameters of the beam on the bending and free vibration responses of functionally graded beam are discussed.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001818852
|
oai_dc
|
Effects of tendon damage on static and dynamic behavior of CFTA girder
|
Effects of tendon damage on static and dynamic behavior of CFTA girder
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Thuy Dung Vu(군산대학교); 김두기(군산대학교); 이상윤(한국건설기술연구원); Sandeep Chaudhary(Malaviya National Institute of Technology)"
] |
Experimental studies and finite element analyses have been carried out to establish the effect of tendon damage on the structural behavior of concrete filled tubular tied arch girder (CFTA girder). The damage of tendon is considered in different stages by varying the number of damaged cables in the tendon. Static and dynamic structural parameters are observed at each stage. The results obtained from the experiments and numerical studies have been compared to validate the studies. The tendons whose damage can significantly affect the stiffness of the CFTA girder are identified by performing the sensitivity analysis. The locations in the girder which are sensitive to the tendon damage are also identified.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001812730
|
oai_dc
|
Experimental research on sagging bendin resistance of steel sheeting-styrofoam-concrete composite sandwich slabs
|
Experimental research on sagging bendin resistance of steel sheeting-styrofoam-concrete composite sandwich slabs
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"P.Z. Cao(Hohai University); Y.F. Lu(Hohai University); Kai Wu(Hohai University)"
] |
A new-styrofoam-concrete composite sandwich slab with function of heat insulation is designed. Four full-scale simply supported composite sandwich slabs with different shear connectors are tested. Parameters under study are the thickness of the concrete, the height of profiled steel sheeting, the influence of shear connectors including the steel bars and self-drilling screws. Experimental results showing that four specimens mainly failed in bending failure mode; the shear connectors can limit the longitudinal slippery between the steel profiled sheeting and the concrete effectively and thus guarantee the good composite action and cooperative behavior of two materials. The ultimate sagging bending resistance can be determined based on plastic theory. This new composite sandwich slab has high sagging bending resistance and good ductility. Additionally, these test results help the design and application of this new type of composite sandwich slab.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001812727
|
oai_dc
|
Relative static and dynamic performances of composite conoidal shell roofs
|
Relative static and dynamic performances of composite conoidal shell roofs
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kaustav Bakshi(Jadavpur University); Dipankar Chakravorty(Jadavpur University)"
] |
Conoidal shells are doubly curved stiff surfaces which are easy to cast and fabricate due to their singly ruled property. Application of laminated composites in fabrication of conoidal shells reduces gravity forces and mass induced forces compared to the isotropic constructions due to the high strength to weight ratio of the material. These light weight shells are preferred in the industry to cover large column free open spaces. To ensure design reliability under service conditions, detailed knowledge about different behavioral aspects of conoidal shell is necessary. Hence, in this paper, static bending, free and forced vibration responses of composite conoidal shells are studied. Lagrange's equation of motion is used in conjunction with Hamilton's principle to derive governing equations of the shell. A finite element code using eight noded curved quadratic isoparametric elements is developed to get the solutions. Uniformly distributed load for static bending analysis and three different load time histories for solution of forced vibration problems are considered. Eight different stacking sequences of graphite-epoxy composite and two different boundary conditions are taken up in the present study. The study shows that relative performances of different shell combinations in terms of static behaviour cannot provide an idea about how they will relatively behave under dynamic loads and also the fact that the points of occurrence of maximum static and dynamic displacement may not be same on a shell surface.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001812724
|
oai_dc
|
Degradation and damage behaviors of steel frame welded connections
|
Degradation and damage behaviors of steel frame welded connections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Meng Wang(Beijing Jiaotong University); Yongjiu Shi(Tsinghua University); Yuanqing Wang(Tsinghua University); Jun Xiong(Tsinghua University); Hong Chen(Tsinghua University)"
] |
In order to study the degradation and damage behavirs of steel frame welded connections, two series of tests in references with different connection constructions were carried out subjected to various cyclic loading patterns. Hysteretic curves, degradation and damage behaviours and fatigue properties of specimens were firstly studied. Typical failure modes and probable damage reasons were discussed. Then, various damage index models with variables of dissipative energy, cumulative displacement and combined energy and displacement were summarized and applied for all experimental specimens. The damage developing curves of ten damage index models for each connection were obtained. Finally, the predicted and evaluated capacities of damage index models were compared in order to describe the degraded performance and failure modes. The characteristics of each damage index model were discussed in depth, and then their distributive laws were summarized. The tests and analysis results showed that the loading histories significantly affected the distributive shapes of damage index models. Different models had their own ranges of application. The selected parameters of damage index models had great effect on the developing trends of damage curves. The model with only displacement variable was recommended because of a more simple form and no integral calculation, which was easier to be formulated and embedded in application programs.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001812732
|
oai_dc
|
Nonlinear vibration of Euler-Bernoulli beams resting on linear elastic foundation
|
Nonlinear vibration of Euler-Bernoulli beams resting on linear elastic foundation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mehran Javanmard(University of Zanjan); Mahdi Bayat(Islamic Azad University); Alireza Ardakani(Imam Khomeini International University)"
] |
In this study simply supported nonlinear Euler-Bernoulli beams resting on linear elasticfoundation and subjected to the axial loads is investigated. A new kind of analytical technique for anon-linear problem called He’s Energy Balance Method (EBM) is used to obtain the analytical solution fornon-linear vibration behavior of the problem. Analytical expressions for geometrically non-linear vibrationof Euler-Bernoulli beams resting on linear elastic foundation and subjected to the axial loads are provided.
The effect of vibration amplitude on the non-linear frequency and buckling load is discussed. The variationof different parameter to the nonlinear frequency is considered completely in this study. The nonlinearvibration equation is analyzed numerically using Runge-Kutta 4th technique. Comparison of Energy BalanceMethod (EBM) with Runge-Kutta 4th leads to highly accurate solutions.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001812734
|
oai_dc
|
Generalized evolutionary optimum design of fiber-reinforced tire belt structure
|
Generalized evolutionary optimum design of fiber-reinforced tire belt structure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J.R. Cho(부산대학교); J. H. LEE(부산대학교); K. W. KIM(금호타이어); 이시복(부산대학교)"
] |
This paper deals with the multi-objective optimization of tire reinforcement structures such as the tread belt and the carcass path. The multi-objective functions are defined in terms of the discrete-type design variables and approximated by artificial neutral network, and the sensitivity analyses of these functions are replaced with the iterative genetic evolution. The multi-objective optimization algorithm introduced in this paper is not only highly CPU-time-efficient but it can also be applicable to other multi-objective optimization problems in which the objective function, the design variables and the constraints are not continuous but discrete. Through the illustrative numerical experiments, the fiber-reinforced tire belt structure is optimally tailored. The proposed multi-objective optimization algorithm is not limited to the tire reinforcement structure, but it can be applicable to the generalized multi-objective structural optimization problems in various engineering applications.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001812729
|
oai_dc
|
Thermal buckling of functionally graded sandwich plates using a new hyperbolic shear displacement model
|
Thermal buckling of functionally graded sandwich plates using a new hyperbolic shear displacement model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Fatima Zohra Kettaf(Université de Sidi Bel Abbes); Abdelouahed Tounsi(Université Sidi Bel Abbes); Mohammed Sid Ahmed Houari(Université de Sidi Bel Abbes); Mohamed Benguediab(Université Sidi Bel Abbes)"
] |
In the present study, the thermal buckling behavior of functionally graded sandwich plates is studied using a new hyperbolic displacement model. Unlike any other theory, the theory is variationally consistent and gives four governing equations. Number of unknown functions involved in displacement field is only four, as against five in case of other shear deformation theories. This present model takes into account the parabolic distribution of transverse shear stresses and satisfies the condition of zero shear stresses on the top and bottom surfaces without using shear correction factor. Material properties and thermal expansion coefficient of the sandwich plate faces are assumed to be graded in the thickness direction according to a simple power-law distribution in terms of the volume fractions of the constituents. The core layer is still homogeneous and made of an isotropic material. The thermal loads are assumed as uniform, linear and non-linear temperature rises across the thickness direction. The results reveal that the volume fraction index, loading type and functionally graded layers thickness have significant influence on the thermal buckling of functionally graded sandwich plates.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001752133
|
oai_dc
|
Structural design of steel fibre reinforced concrete in-filled steel circular columns
|
Structural design of steel fibre reinforced concrete in-filled steel circular columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hanan H. Eltobgy(Benha University)"
] |
This paper presents the behavior and design of axially loaded normal and steel fiber reinforced concrete in-filled steel tube (SFRCFT) columns, to examine the contribution of steel fibers on the compressive strength of the composite columns. Non-linear finite element analysis model (FEA) using ANSYS software has been developed and used in the analysis. The confinement effect provided by the steel tube is considered in the analysis. Comparisons of the analytical model results, along with other available experimental outputs from literature have been done to verify the structural model. The compressive strength and stiffness of SFRC composite columns were discussed, and the interpretation of the FEA model results has indicated that, the use of SFRC as infill material has a considerable effect on the strength and stiffness of the composite column. The analytical model results were compared with the existing design methods of composite columns – (EC4, AISC/LRFD and the Egyptian code of Practice for Steel Construction, ECPSC/LRFD). The comparison indicated that, the results of the FEA model were evaluated to an acceptable limit of accuracy. The code design equations were modified to introduce the steel fiber effect and compared with the results of the FEA model for verification.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001752130
|
oai_dc
|
A comparative study on bond of different grade reinforcing steels in concrete under accelerated corrosion
|
A comparative study on bond of different grade reinforcing steels in concrete under accelerated corrosion
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"G. Kürklü(Kocatepe University); M.S. Başpinar(Kocatepe University); A. Ergün(Kocatepe University)"
] |
Corrosion is important reason for the deterioration of the bond between reinforcing steel and the surrounding concrete. Corrosion of the steel mainly depends on its microstructure. Smooth S220, ribbed S420 and S500 grade reinforcing steels were used in the experiments. Samples were subjected to accelerated corrosion. Pullout tests were carried out to evaluate the effects of corrosion on bond strength of the specimens. S500 grade steel which has tempered martensite microstructure showed lower corrosion rate in concrete than S220 and S420 steels which have ferrite+perlite microstructure. S500 grade steel showed highest bond strength among the other steel grades in concrete. Bond strength between reinforcing steel and concrete increased with increase in the strength of steel and concrete. It also depends on whether reinforcing bar is ribbed or not.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001752134
|
oai_dc
|
Application of a new extended layerwise approach to thermal buckling load optimization of laminated composite plates
|
Application of a new extended layerwise approach to thermal buckling load optimization of laminated composite plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Umut Topal(Karadeniz Technical University)"
] |
This paper deals with the applicability of a new extended layerwise optimization method for thermal buckling load optimization of laminated composite plates. The design objective is the maximization of the critical thermal buckling of the laminated plates. The fibre orientations in the layers are considered as design variables. The first order shear deformation theory (FSDT) is used for the finite element solution of the laminates. Finally, the numerical analysis is carried out to show the applicability of extended layerwise optimization algorithm of laminated plates for different parameters such as plate aspect ratios and boundary conditions.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001752132
|
oai_dc
|
Distortional and local buckling of steel-concrete composite box-beam
|
Distortional and local buckling of steel-concrete composite box-beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lizhong Jiang(Central South University); Jingjing Qi(Hunan University of Science and Technology); Andrew Scanlon(The Pennsylvania State University); Linlin Sun(Central South University)"
] |
Distortional and local buckling are important factors that influences the bearing capacity of steel-concrete composite box-beam. Through theoretical analysis of distortional buckling forms, a stability analysis calculation model of composite box beam considering rotation of steel beam top flange is resented. The critical bending moment calculation formula of distortional buckling is established. In addition, mechanical behaviors of a steel beam web in the negative moment zone subjected separately to bending stress, shear stress and combined stress are investigated. Elastic buckling factors of steel web under different stress conditions are calculated. On the basis of local buckling analysis results, a limiting value for height-to thickness ratio of a steel web in the elastic stage is proposed. Numerical examples are presented to verify the proposed models.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001752129
|
oai_dc
|
Flexural-torsional buckling tests of cold-formed steel compression members at elevated temperatures
|
Flexural-torsional buckling tests of cold-formed steel compression members at elevated temperatures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yasintha Bandula Heva(Queensland University of Technology); Mahen Mahendran(Queensland Univ. of Technology)"
] |
Current design standards do not provide adequate guidelines for the fire design of cold-formed steel compression members subject to flexural-torsional buckling. Eurocode 3 Part 1.2 (2005) recommends the same fire design guidelines for both hot-rolled and cold-formed steel compression members subject to flexural-torsional buckling although considerable behavioural differences exist between cold-formed and hot-rolled steel members. Past research has recommended the use of ambient temperature cold-formed steel design rules for the fire design of cold-formed steel compression members provided appropriately reduced mechanical properties are used at elevated temperatures. To assess the accuracy of flexural-torsional buckling design rules in both ambient temperature cold-formed steel design and fire design standards, an experimental study of slender cold-formed steel compression members was undertaken at both ambient and elevated temperatures. This paper presents the details of this experimental study, its results, and their comparison with the predictions from the current design rules. It was found that the current ambient temperature design rules are conservative while the fire design rules are overly conservative. Suitable recommendations have been made in relation to the currently available design rules for flexural-torsional buckling including methods of improvement. Most importantly, this paper has addressed the lack of experimental results for slender cold-formed steel columns at elevated temperatures.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001752135
|
oai_dc
|
A simplified approach for fire-resistance design of steel-concrete composite beams
|
A simplified approach for fire-resistance design of steel-concrete composite beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Guo-Qiang Li(Tongji University); Wei-Yong Wang(Chongqing University)"
] |
In this paper, a simplified approach based on critical temperature for fire resistance design of steel-concrete composite beams is proposed. The method for determining the critical temperature and fire protection of the composite beams is developed on the basis of load-bearing limit state method employed in current Chinese Technical Code for Fire safety of Steel Structure in Buildings. Parameters affecting the critical temperature of the composite beams are analysed. The results show that at a definite load level, section shape of steel beams, material properties, effective width of concrete slab and concrete property model have little influence on the critical temperature of composite beams. However, the fire duration and depth of concrete slab have significant influence on the critical temperature. The critical temperatures for commonly used composite beams, at various depth of concrete and fire duration, are given to provide a reference for engineers. The validity of the practical approach for predicting the critical temperature of the composite beams is conducted by comparing the prediction of a composite beam with the results from some fire design codes and full scale fire resistance tests on the composite beam.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001705599
|
oai_dc
|
Cyclic test of buckling restrained braces composed of square steel rods and steel tube
|
Cyclic test of buckling restrained braces composed of square steel rods and steel tube
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"박준희(한국원자력연구원); 이준호(성균관대학교); 김진구(성균관대학교)"
] |
In this study total of six buckling-restrained braces (BRBs) were manufactured using a square steel rod as a load-resisting core member and a hollow steel tube as restrainer to prevent global buckling of the core. The gap between the core and the tube was filled with steel rods as filler material. The performances of the proposed BRB from uniaxial and subassemblage tests were compared with those of the specimens filled with mortar. The test results showed that the performance of the BRB with discontinuous steel rods as filler material was not satisfactory, whereas the BRBs with continuous steel rods as filler material showed good performance when the external tubes were strong enough against buckling. It was observed that the buckling strength of the external tube of the BRBs filled with steel rods needs to be at least twice as high as that of the BRBs filled with mortar to ensure high cumulative plastic deformation of the BRB.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001705598
|
oai_dc
|
Shear strength formula of CFST column-beam pinned connections
|
Shear strength formula of CFST column-beam pinned connections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이성희(특허청); 김영호(세진특허법률사무소); 최성모(서울시립대학교)"
] |
Recently, as the height of building is getting higher, the applications of CFST column for highrise buildings have been increased. In structural system of high-rise building, The RC core and exterior concrete-filled tubular (CFST) column-beam pinned connection is one of the structural systems that support lateral load. If this structural system is used, due to the minimal CFST column thickness compared to that of the CFST column width, the local moment occurred by the eccentric distance between the column flange surface from shear bolts joints degrades the shear strength of the CFST column-beam pinned connections. This study performed a finite element analysis to investigate the shear strength under eccentric moment of the CFST column-beam pinned connections. The column’s width and thickness were used as variables for the analysis. To guarantee the reliability of the finite element analysis, an actual-size specimens were fabricated and tested. The yield line theory was used to formulate an shear strength formula for the CFT column–beam pinned connection. the shear strength formula was suggested through comparison on the results of FEM analysis, test and yield lime theory, the shear strength formula was suggested.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001705605
|
oai_dc
|
Experimental investigations on composite slabs to evaluate longitudinal shear strength
|
Experimental investigations on composite slabs to evaluate longitudinal shear strength
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Saravanan, M.(CSIR Campus); Marimuthu, V(CSIR Campus); Prabha, P.(CSIR Campus); Arul Jayachandran, S.(CSIR Campus); Datta, D.(Institute for Steel Development And Growth)"
] |
Cold-formed steel profile sheets acting as decks have been popularly used in composite slab systems in steel structural works, since it acts as a working platform as well as formwork for concreting during construction stage and also as tension reinforcement for the concrete slab during service. In developing countries like India, this system of flooring is being increasingly used due to the innate advantage of these systems. Three modes of failure have been identified in composite slab such as flexural, vertical shear and longitudinal shear failure. Longitudinal shear failure is the one which is difficult to predict theoretically and therefore experimental methods suggested by Eurocode 4 (EC 4) of four point bending test is in practice throughout world. This paper presents such an experimental investigation on embossed profile sheet acting as a composite deck where in the longitudinal shear bond characteristics values are evaluated. Two stages, brittle and ductile phases were observed during the tests. The cyclic load appears to less effect on the ultimate shear strength of the composite slab.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001705602
|
oai_dc
|
The structural performance of axially loaded CFST columns under various loading conditions
|
The structural performance of axially loaded CFST columns under various loading conditions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Fuyun Huang(Fuzhou University); Xinmeng Yu(Fuzhou University); Baochun Chen(Fuzhou University)"
] |
Concrete filled steel tube (CFST) structures have been used widely in high-rise buildings and bridges due to the efficiency of structurally favourable interaction between the steel tube and the concrete core. In the current design codes only one loading condition in the column members is considered, i.e., the load is applied on the steel tube and concrete core at the same time. However, in engineering practice the tube structures may be subjected to various loading conditions such as loading on the concrete core only, preloading on the steel tube skeleton before filling of concrete core, and so on. In this research, a series of comparative experiments were carried out to study the structural performance of concrete filled circular steel tube columns subject to four concentric loading schemes. Then, a generalized prediction method is developed to evaluate the ultimate load capacity of CFST columns subject to various loading conditions. It is shown that the predictions by the proposed method agree well with test results.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001705601
|
oai_dc
|
Experimental study on shear capacity of circular concrete filled steel tubes
|
Experimental study on shear capacity of circular concrete filled steel tubes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Congzhen Xiao(China Academy of Building Research); Shaohuai Cai(China Academy of Building Research); Tao Chen(China Academy of Building Research); Chunli Xu(China Academy of Building Research)"
] |
Concrete filled steel tube (CFST) structures have recently seen wide use in China, but studies of the shear problem of CFST are inadequate. This paper presents an experimental study on the shear capacity of circular concrete filled steel tube (CCFT) specimens with and without axial compression force. Shear capacity, ductility, and damage modes of CCFTs were investigated and compared. Test results revealed the following: 1) CCFTs with a small shear span ratio may fail in shear in a ductile manner; 2) Several factors including section size, material properties, shear span ratio, axial compression ratio, and confinement index affect the shear capacity of CCFTs. Based on test results and analysis, this paper proposes a design formula for the shear capacity of CCFTs.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001705604
|
oai_dc
|
Shear mechanism and bearing capacity calculation on steel reinforced concrete special-shaped columns
|
Shear mechanism and bearing capacity calculation on steel reinforced concrete special-shaped columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J.Y. Xue(Xi’an University of Architecture and Technology); Z.P. Chen(Guangxi University); H.T. Zhao(Xi’an University of Architecture and Technology); L. Gao(Xi’an University of Architecture and Technology); Z.Q. Liu(Xi’an University of Architecture and Technology)"
] |
An experimental study was performed to investigate the seismic performance of steel reinforced concrete (SRC) special-shaped columns. For this purpose, 17 steel reinforced concrete special-shaped column specimens under low-cyclic reversed load were tested, load process and failure patterns of the specimens with different steel reinforcement were observed. The test results showed that the failure patterns of these columns include shear-diagonal compression failure, shear-bond failure, shear-flexure failure and flexural failure. The failure mechanisms and characteristics of SRC special-shaped columns were also analyzed. For different SRC special-shaped columns, based on the failure characteristics and mechanism observed from the test, formulas for calculating ultimate shear capacity in shear-diagonal compression failure and shear-bond failure under horizontal axis and oblique load were derived. The calculated results were compared with the test results. Both the theoretical analysis and the experimental results showed that, the shear capacity of T, L shaped columns under oblique load are larger than that under horizontal axis load, whereas the shear capacity of ╋-shaped columns under oblique load are less than that under horizontal axis load.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001661612
|
oai_dc
|
Evaluation of the seismic performance of off-centre bracing system with ductile element in steel frames
|
Evaluation of the seismic performance of off-centre bracing system with ductile element in steel frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Bazzaz(Semnan University); Ali Kheyroddin(Semnan University); Mohammad Ali Kafi(Semnan University); Zahra Andalib(Semnan University)"
] |
In order to evaluate the dynamic behavior of passive energy dissipation system, two steps need to be considered for prediction of structural response in the presence of ductile element in an off-centre bracing system. The first is a detailed analysis of the proposed ductile element and the second is the effect of this ductile element on an off-centre bracing system. The use of ductile bracing system is expanding in steel structures in order to increase the force reduction factor. Therefore, regarding the nonlinear behavior of steel material used in an off-centre bracing systems and using ductile element in OBS bracing systems, the seismic evaluation of the mentioned systems seems to be necessary. This paper aims to study linear and nonlinear behavior of steel frames with off-centre bracing system and ductile element, in order to get the best position of these bracing elements. To achieve this purpose, the modeling has been done with ANSYS software. The optimum eccentricity has been obtained by modeling three steel frames with different eccentricities and evaluating the results of them. The analytical results showed that the model OBS-C with 0.3 eccentricities has higher performance among the models.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000105.xml
|
||
ART001661610
|
oai_dc
|
Experimental study on the cable rigidness and static behaviors of AERORail structure
|
Experimental study on the cable rigidness and static behaviors of AERORail structure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Fangyuan Li(Tongji University); Peifeng Wu(Tongji University); Dongjie Liu(Guangdong Highway Design Institute Co)"
] |
This paper presented a new aerial platform-AERORail for rail transport and its structure evolution based on the elastic stiffness of cable; through the analysis on the cable properties when the cable supported a small service load with high-tensile force, summarized the theoretical basis of the AERORail structure and the corresponding simplified analysis model. There were 60 groups of experiments for a single naked cable model under different tensile forces and different services loads, and 48 groups of experiments for the cable with rail combined structure model. The experimental results of deflection characteristics were compared with the theoretical values for these two types of structures under the same conditions. It proved that the results almost met the classical cable theory. The reason is that a small deflection was required when this structure was applied. After the tension increments tests with moving load, it is verified that the relationships between the structure stiffness and tension force and service load are simple. Before further research and applications are made, these results are necessary for the determination of the reasonable and economic tensile force, allowable service load for the special span length for this new platform.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000105.xml
|
||
ART001661580
|
oai_dc
|
An enhanced method of predicting effective thickness of corroded steel plates
|
An enhanced method of predicting effective thickness of corroded steel plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tatsumasa Kaita(Tokuyama College of Technology); J.M. Ruwan S. Appuhamy(Ehime University); J.M. Ruwan S. Appuhamy(Ehime University); Katashi Fujii(Hiroshima University)"
] |
Many steel bridge infrastructures in the world are getting older, and a large number of these structures are in need of maintenance, rehabilitation or replacement. Most of them are subjected to corrosion due to exposure to aggressive environmental conditions and inadequate maintenance, causing reduction of their carrying capacities. In order to have an adequate bridge management, it is of paramount importance to develop an efficient, accurate and rapid condition assessment method which can be used to make reliable decisions affecting the cost and safety. Therefore, a simple and accurate method of calculating remaining yield and tensile strength by using a concept of representative effective thickness with correlation of initial thickness and maximum corroded depth is proposed in this study, based on the results of many tensile coupon tests of corroded plates obtained from a steel plate girder with severe corrosion, used for about 100 years. Furthermore, a strength reduction diagram which will be very useful for bridge inspection engineers to make rational decisions about the maintenance management of aged steel bridge infrastructures is presented.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000105.xml
|
||
ART001661583
|
oai_dc
|
Experimental behaviour of composite beams subjected to a hogging moment
|
Experimental behaviour of composite beams subjected to a hogging moment
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Marisa Pecce(University of Sannio); Fernando Rossi(University of Sannio); Fabio Antonio Bibbò(University of Sannio); Francesca Ceroni(University of Sannio)"
] |
The present work addresses the rotational capacity of steel-concrete composite beams, which is a key issue for the seismic design of composite frames. Several experimental tests from the literature are summarised, and the effects of various parameters on the available plastic rotation are discussed. Furthermore, a number of remarks are made regarding the need for supplementary experimental results. The authors carried out experimental tests on four composite beams in which the type, width and connection degree of the slab were varied. During the tests, the deflection and strains in the steel profiles and bars were measured and recorded, wherein the observed trends in the measured parameters indicated that the failure mode of the beam was influenced by global and local buckling. A comparison of the experimental results to the theoretical ultimate strengths and moment-curvature relationships confirms that buckling phenomena occurred after section yielding, even if a consistent plastic rotation developed. This rotational capacity is well evaluated by a formulation that is available in the literature.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000105.xml
|
||
ART001661608
|
oai_dc
|
Construction stage analysis of three-dimensional cable-stayed bridges
|
Construction stage analysis of three-dimensional cable-stayed bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Barbaros Atmaca(Karadeniz Technical University); Sevket Ates(Karadeniz Technical University)"
] |
In this paper, nonlinear static analysis of three-dimensional cable stayed bridges is performed for the time dependent materials properties such as creep, shrinkage and aging of concrete and relaxation of cable. Manavgat Cable-Stayed Bridge is selected as an application. The bridge located in Antalya, Turkey, was constructed with balanced cantilever construction method. Total length of the bridge is 202 m. The bridge consists of one ë shape steel tower. The tower is at the middle of the bridge span. The construction stages and 3D finite element model of bridge are modeled with SAP2000. Large displacement occurs in these types of bridges so geometric nonlinearity is taken into consideration in the analysis by using P-Delta plus large displacement criterion. The time dependent material strength and geometric variations are included in the analysis. Two different finite element analyses carried out which are evaluated with and without construction stages and results are compared with each other. As a result of these analyses, variation of internal forces such as bending moment, axial forces and shear forces for bridge tower and displacement and bending moment for bridge deck are given with detailed. It is seen that construction stage analysis has a remarkable effect on the structural behavior of the bridge.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000105.xml
|
||
ART001761747
|
oai_dc
|
Experimental and theoretical research on mechanical behavior of innovative composite beams
|
Experimental and theoretical research on mechanical behavior of innovative composite beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gang Zhu(Xi’an University of Arch. and Tech.); Jianyang Xue(Xi’an University of Arch. and Tech.); Yong Yang(Xi’an University of Arch. and Tech); Jianguo Nie(Tsinghua University)"
] |
The web-encased steel-concrete composite (WESCC) beam is a new developed steel-concrete composite beam. Experiments of six simply supported WESCC beam specimens were conducted. The effects of the shear-span ratio and steel section type were all investigated on the static behaviors such as failure modes, failure mechanism and bearing capacity. The experimental results denoted that all specimens failed in bending mode and the degree of combination between the bottom armor plate of steel shape and concrete were very well without any evident slippage, which demonstrated that the function of bottom armor plate and web were fully exerted in the WESCC beams. It could be concluded the WESCC beams have high stiffness, high load carrying capacity and advanced ductility. The design methods are proposed which mainly consist the bearing capacity calculation of bending and flexural rigidity. The calculation results of the bearing capacity and deflection which take the shear deflection into account are in agreement with the experimental results. The design methods are useful for design and application of the innovative composite beams.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001761764
|
oai_dc
|
Pareto optimum design of laminated composite truncated circular conical shells
|
Pareto optimum design of laminated composite truncated circular conical shells
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Umut Topal(Karadeniz Technical University)"
] |
This paper deals with multiobjective optimization of symmetrically laminated composite truncated circular conical shells subjected to external uniform pressure load and thermal load. The design objective is the maximization of the weighted sum of the critical buckling load and fundamental frequency. The design variable is the fibre orientations in the layers. The performance index is formulated as the weighted sum of individual objectives in order to obtain optimal solutions of the design problem. The first-order shear deformation theory (FSDT) is used in the mathematical formulation of laminated truncated conical shells. Finally, the effect of different weighting factors, length-to-radius ratio, semi-cone angle and boundary conditions on the optimal design is investigated and the results are compared.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001761753
|
oai_dc
|
Parametric study on equivalent damping ratio of different composite structural building systems
|
Parametric study on equivalent damping ratio of different composite structural building systems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ahmed Abdelraheem Farghaly(Sohag University)"
] |
Structures consisting of concrete and steel parts, which are irregular in damping ratios are investigated. This investigation is a code-based seismic design of such structures. Several practical difficulties encountered, due to inherent differences in the nature of dynamic response of each part, and the different damping ratios of the two parts. These structures are irregular in damping ratios and have complex modes of vibration so that their analysis cannot be handled with the readily available commercial software. Therefore, this work aims to provide simple yet sufficiently accurate constant values of equivalent damping ratios applied to the whole structure for handling the damping irregularity of such structures. The results show that the equivalent damping ratio changes with the height of the building and the kind of the structural system, but it is constant for all accelerations values. Thus, available software SAP2000 applied for seismic analysis, design and the provisions of existing seismic codes. Finally, evaluation of different kinds of structural system used in this research to find the most energy dissipating one found by finding the best value of quality coefficient.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001761750
|
oai_dc
|
Large deformation analysis for functionally graded carbon nanotube-reinforced composite plates using an efficient and simple refined theory
|
Large deformation analysis for functionally graded carbon nanotube-reinforced composite plates using an efficient and simple refined theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K. Bakhti(Université de Sidi Bel Abbes); A. Tounsi(Université de Sidi Bel Abbes); A. Kaci(Université de Sidi Bel Abbes, Universitaire Mustapha Stambouli); A.A. Bousahla(Université de Sidi Bel Abbes); M.S.A. Houari(Université de Sidi Bel Abbes); E. A. Adda Bedia(Université de Sidi Bel Abbes)"
] |
In this paper, the nonlinear cylindrical bending behavior of functionally graded nanocomposite plates reinforced by single-walled carbon nanotubes (SWCNTs) is studied using an efficient and simple refined theory. This theory is based on assumption that the in-plane and transverse displacements consist of bending and shear components in which the bending components do not contribute toward shear forces and, likewise, the shear components do not contribute toward bending moments. The material properties of SWCNTs are assumed to be temperature-dependent and are obtained from molecular dynamics simulations. The material properties of functionally graded carbon nanotube-reinforced composites (FG-CNTCRs) are assumed to be graded in the thickness direction, and are estimated through a micromechanical model. The fundamental equations for functionally graded nanocomposite plates are obtained using the Von-Karman theory for large deflections and the solution is obtained by minimization of the total potential energy. The numerical illustrations concern the nonlinear bending response of FG-CNTRC plates under different sets of thermal environmental conditions, from which results for uniformly distributed CNTRC plates are obtainedas comparators.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001761759
|
oai_dc
|
Consequence-based robustness assessment of a steel truss bridge
|
Consequence-based robustness assessment of a steel truss bridge
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Pierluigi Olmati(Sapienza University of Rome); Konstantinos Gkoumas(Sapienza University of Rome); Francesca Brando(Thornton Tomasetti); Liling Cao(Thornton Tomasetti)"
] |
Aim of this paper is to apply to a steel truss bridge a methodology that takes into account the consequences of extreme loads on structures, focusing on the influence that the loss of primary elements has on the structural load bearing capacity. In this context, the topic of structural robustness, intended as the capacity of a structure to withstand damages without suffering disproportionate response to the triggering causes while maintaining an assigned level of performance, becomes relevant. In the first part of this study, a brief literature review of the topics of structural robustness, collapse resistance and progressive collapse takes place, focusing on steel structures. In the second part, a procedure for the evaluation of the structural response and robustness of skeletal structures under impact loads is presented and tested in simple structures. Following that, an application focuses on a case study bridge, the extensively studied I-35W Minneapolis steel truss bridge. The bridge, which had a structural design particularly sensitive to extreme loads, recently collapsed for a series of other reasons, in part still under investigation. The applied method aims, in addition to the robustness assessment, at increasing the collapse resistance of the structure by testing alternative designs.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001761756
|
oai_dc
|
Structural damage detection of steel bridge girder using artificial neural networks and finite element models
|
Structural damage detection of steel bridge girder using artificial neural networks and finite element models
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.J.S. Hakim(University of Malaya); H. Abdul Razak(University of Malaya)"
] |
Damage in structures often leads to failure. Thus it is very important to monitor structures for the occurrence of damage. When damage happens in a structure the consequence is a change in its modal parameters such as natural frequencies and mode shapes. Artificial Neural Networks (ANNs) are inspired by human biological neurons and have been applied for damage identification with varied success. Natural frequencies of a structure have a strong effect on damage and are applied as effective input parameters used to train the ANN in this study. The applicability of ANNs as a powerful tool for predicting the severity of damage in a model steel girder bridge is examined in this study. The data required for the ANNs which are in the form of natural frequencies were obtained from numerical modal analysis. By incorporating the training data, ANNs are capable of producing outputs in terms of damage severity using the first five natural frequencies. It has been demonstrated that an ANN trained only with natural frequency data can determine the severity of damage with a 6.8% error. The results shows that ANNs trained with numerically obtained samples have a strong potential for structural damage identification.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001682433
|
oai_dc
|
Design strategy of hybrid stay cable system using CFRP and steel materials
|
Design strategy of hybrid stay cable system using CFRP and steel materials
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"C.S. Cai(Louisiana State University); Wen Xiong(Southeast University); Rucheng Xiao(Tongji University); Yin Zhang(Tsinghua University)"
] |
To enhance cable stiffness, this paper proposed a combined application of carbon fiber reinforced polymers (CFRP) and steel materials, resulting in a novel type of hybrid stay cable system especially for the cable-stayed bridges with main span lengths of 1400~2800 m. In this combination, CFRP materials can conserve all their advantages such as light weight and high strength; while steel materials help increase the equivalent stiffness to compensate for the low elastic modulus of CFRP materials. An increase of the equivalent stiffness of the hybrid stay cable system could be further obtained with a reasonable increase of its safety factor. Following this concept, a series of parametric studies for the hybrid stay cable system with the consideration of stiffness and cost were carried out. Three design strategies/criteria, namely, best equivalent stiffness with a given safety factor, highest ratio of equivalent stiffness to material cost with a given safety factor, and best equivalent stiffness under a given cost were proposed from the stiffness and cost viewpoints. Finally, a comprehensive design procedure following the proposed design strategies was suggested. It was shown that the proposed hybrid stay cable system could be a good alternative to the pure CFRP or traditional steel stay cables in the future applications of super long span bridges.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000105.xml
|
||
ART001682430
|
oai_dc
|
Ultimate capacity of welded box section columns with slender plate elements
|
Ultimate capacity of welded box section columns with slender plate elements
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hong-Xia Shen(Xi’an University of Architecture and Technology)"
] |
For an axially loaded box-shaped member, the width-to-thickness ratio of the plate elements preferably should not be greater than 40 for Q235 steel grades in accordance with the Chinese code GB50017- 2003. However, in practical engineering the plate width-to-thickness ratio is up to 120, much more than the limiting value. In this paper, a 3D nonlinear finite element model is developed that accounts for both geometrical imperfections and residual stresses and the ultimate capacity of welded built-up box columns,with larger width-to-thickness ratios of 60, 70, 80, and 100, is simulated. At the same time, the interaction buckling strength of these members is determined using the effective width method recommended in the Chinese code GB50018-2002, Eurocode 3 EN1993-1 and American standard ANSI/AISC 360-10 and the direct strength method developed in recent years. The studies show that the finite element model proposed can simulate the behavior of nonlinear buckling of axially loaded box-shaped members very well. The width-tothickness ratio of the plate elements in welded box section columns can be enlarged up to 100 for Q235 steel grades. Good agreements are observed between the results obtained from the FEM and direct strength method. The modified direct strength method provides a better estimation of the column strength compared to the direct strength method over the full range of plate width-to-thickness ratio. The Chinese code and Eurocode 3 are overly conservative prediction of column capacity while the American standard provides a better prediction and is slightly conservative for b/t = 60. Therefore, it is suggested that the modified direct strength method should be adopted when revising the Chinese code.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000105.xml
|
||
ART001682431
|
oai_dc
|
The beneficial effects of beam web opening in seismic behavior of steel moment frames
|
The beneficial effects of beam web opening in seismic behavior of steel moment frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Saeed Erfani(Amirkabir University of Technology); Ata Babazadeh Naseri(Amirkabir University of Technology); Vahid Akrami(Amirkabir University of Technology)"
] |
Implementation of openings in beams web has been introduced as an innovative method for improving seismic performance of steel moment frames. In this paper, several steel moment frames have been studied in order to evaluate the effect of openings in beams web. The beam sections with web opening have been modeled as a simplified super-element to be used in designing frames and to determine opening configurations. Finite element models of designed frames were generated and nonlinear static pushover analysis was conducted. The efficient location for openings along the beam length was discovered and the effects of beams with web openings on local and global behavioral characteristics of frames were discussed. Base on the results, seismic performance of steel moment frames was improved by creating openings in beams web, in terms of reduction in stress level of frame sensitive areas such as beam to column connections and panel zones.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000105.xml
|
||
ART001682435
|
oai_dc
|
Pre-buckling deflection effects on stability of thin-walled beams with open sections
|
Pre-buckling deflection effects on stability of thin-walled beams with open sections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohri, F.(Université de lorraine); Damil, N.(Université Hassan II - Mohammedia); Potier-Ferry, M.(Université de lorraine)"
] |
The paper investigates beam lateral buckling stability according to linear and non-linear models. Closed form solutions for single-symmetric cross sections are first derived according to a non-linear model considering flexural-torsional coupling and pre-buckling deformation effects. The closed form solutions are compared to a beam finite element developed in large torsion. Effects of pre-buckling deflection and gradient moment on beam stability are not well known in the literature. The strength of singly symmetric I-beams under gradient moments is particularly investigated. Beams with T and I cross-sections are considered in the study. It is concluded that pre-buckling deflections effects are important for I-section with large flanges and analytical solutions are possible. For beams with T-sections, lateral buckling resistance depends not only on pre-buckling deflection but also on cross section shape, load distribution and buckling modes. Effects of prebuckling deflections are important only when the largest flange is under compressive stresses and positive gradient moments. For negative gradient moments, all available solutions fail and overestimate the beam strength. Numerical solutions are more powerful. Other load cases are investigated as the stability of continuous beams. Under arbitrary loads, all available solutions fail, and recourse to finite element simulation is more efficient.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000105.xml
|
||
ART001682438
|
oai_dc
|
Buckling analysis of functionally graded hybrid composite plates using a new four variable refined plate theory
|
Buckling analysis of functionally graded hybrid composite plates using a new four variable refined plate theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Fekrar(Universitade Sidi Bel Abbes); A. Tounsi(Université de Sidi Bel Abbes); N. El Meiche(Université de Sidi Bel Abbes); A. Bessaim(Université de Sidi Bel Abbes); E. A. Adda Bedia(Université de Sidi Bel Abbes)"
] |
In this research, mechanical buckling of hybrid functionally graded plates is considered using a new four variable refined plate theory. Unlike any other theory, the number of unknown functions involved is only four, as against five in case of other shear deformation theories. The theory presented is variationally consistent, does not require shear correction factor, and gives rise to transverse shear stress variation such that the transverse shear stresses vary parabolically across the thickness satisfying shear stress free surface conditions. The plate properties are assumed to be varied through the thickness following a simple power law distribution in terms of volume fraction of material constituents. Governing equations are derived from the principle of minimum total potential energy. The closed-form solution of a simply supported rectangular plate subjected to in-plane loading has been obtained by using the Navier method. The effectiveness of the theories is brought out through illustrative examples.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000105.xml
|
||
ART001682429
|
oai_dc
|
On the characteristics and seismic study of Hat Knee Bracing system, in steel structures
|
Massood Mofid
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Issa JafarRamaji(Sharif University of Technology); Massood Mofid(Sharif University of Technology)"
] |
In this study, a new structural bracing system named ‘Hat Knee Bracing’ (HKB) is presented. In this structural system, a special form of diagonal braces, which is connected to the knee elements instead of beam-column joints, is investigated. The diagonal elements provide lateral stiffness during moderate earthquakes. However the knee elements, which is a fuse-like component, is designed to have one plastic joint in the knee elements for dissipation of the energy caused by strong earthquake. First, a suitable shape for brace and knee elements is proposed through elastic studying of the system and several practical parameters are established. Afterward, by developing applicable and highly accurate models in Drain-2DX, the inelastic behavior of the system is carefully considered. In addition, with inelastic study of the new bracing system and comparison with the prevalent Knee Bracing Frame system (KBF model) in nonlinear static and dynamic analysis, the seismic behavior of the new bracing system is reasonably evaluated.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000105.xml
|
||
ART001663335
|
oai_dc
|
Frequency optimization for laminated composite plates using extended layerwise approach
|
Frequency optimization for laminated composite plates using extended layerwise approach
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Umut Topal(Karadeniz Technical University)"
] |
This paper deals with the applicability of extended layerwise optimization method (ELOM) for frequency optimization of laminated composite plates. The design objective is the maximization of the fundamental frequency of the laminated plates. The fibre orientations in the layers are considered as design variables. The first order shear deformation theory (FSDT) is used for the finite element solution of the laminates. Finally, the numerical analysis is carried out to show the applicability of extended layerwise optimization algorithm of laminated plates for different parameters such as plate aspect ratios and boundary conditions.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000105.xml
|
||
ART001663327
|
oai_dc
|
Nonlinear cylindrical bending of functionally graded carbon nanotube-reinforced composite plates
|
Nonlinear cylindrical bending of functionally graded carbon nanotube-reinforced composite plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Abdelhakim Kaci(Université de Sidi Bel Abbes); Abdelouahed Tounsi(Université de Sidi Bel Abbes); Karima Bakhti(Université de Sidi Bel Abbes); El Abbas Adda Bedia(Université de Sidi Bel Abbes)"
] |
In this paper, the nonlinear cylindrical bending of simply supported, functionally graded nanocomposite plates reinforced by single-walled carbon nanotubes (SWCNTs), is studied. The plates are subjected to uniform pressure loading in thermal environments and their geometric nonlinearity is introduced in the strain–displacement equations based on Von-Karman assumptions. The material properties of SWCNTs are assumed to be temperature-dependent and are obtained from molecular dynamics simulations. The material properties of functionally graded carbon nanotube-reinforced composites (FG-CNTCRs) are assumed to be graded in the thickness direction, and are estimated through a micromechanical model. The governing equations are reduced to linear differential equation with nonlinear boundary conditions yielding a simple solution procedure. Numerical results are presented to show the effect of the material distribution on the deflections and stresses.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000105.xml
|
||
ART001663334
|
oai_dc
|
Load-sharing ratio analysis of reinforced concrete filled tubular steel columns
|
Load-sharing ratio analysis of reinforced concrete filled tubular steel columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Alifujiang Xiamuxi(Hachinohe Institute of Technology); Akira Hasegawa(Xinjiang University)"
] |
It was clear from the former researches on reinforced concrete filled tubular steel (RCFT) structures that RCFT structures have different performance than concrete filled steel tubular (CFT) structures. However, despite of that, load-sharing ratio of RCFT is evaluating by the formula and range of CFT given by JSCE. Therefore, the aim of this investigation is to study the load-sharing ratio of RCFT columns subjected to axial compressive load by performing numerical simulations of RCFT columns with the nonlinear finite element analysis (FEA) program - ADINA. To achieve this goal, firstly proper material constitutive models for concrete, steel tube and reinforcement are proposed. Then axial compression tests of concrete, RC, CFT, and RCFT columns are carried out to verify proposed material constitutive models. Finally, by the plenty of numerical analysis with small-sized and big-sized columns, load-sharing ratio of RCFT columns was studied, the evaluation formulas and range were proposed, application of the formula was demonstrated, and following conclusions were drawn: The FEA model introduced in this paper can be applied to nonlinear analysis of RCFT columns with reliable results; the load-sharing ratio evaluation formula and range of CFT should not be applied to RCFT; The lower limit for the range of load-sharing ratio of RCFT can be smaller than that of CFT; the proposed formulas for load-sharing ratio of RCFT have practical mean in design of RCFT columns.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000105.xml
|
||
ART001663326
|
oai_dc
|
Experimental investigation of residual stresses in cold formed steel sections
|
Experimental investigation of residual stresses in cold formed steel sections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Miroslav Beševic(Faculty of Civil Engineering Subotica)"
] |
Residual stresses play important role for design of steel structural members. Cold formed sections usually have residual stresses caused by roll forming. When compared to stresses caused by the working load, especially for compressed members, the effects of residual stresses can be favorable or unfavorable depending on magnitude, orientation and distribution of these stresses. The research presented in this paper includes experimental investigations of residual stresses, initial imperfections and material properties on cold formed carbon steel open cross sections. Experimental results have been compared to results obtained in similar tests with stainless and high strength steel cross sections. Theoretical and experimental research, conducted for cold formed open cross sections, are important for design of axially compressed members. This paper presents two methods of residual stresses investigation: magnetic method and method of pre-drilled holes and obtained results have been compared with results of residual stresses from other authors.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000105.xml
|
||
ART001663330
|
oai_dc
|
Optimum design of geometrically non-linear steel frames using artificial bee colony algorithm
|
Optimum design of geometrically non-linear steel frames using artificial bee colony algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. O. Degertekin(Dicle University)"
] |
An artificial bee colony (ABC) algorithm is developed for the optimum design of geometrically non-linear steel frames. The ABC is a new swarm intelligence method which simulates the intelligent foraging behaviour of honeybee swarm for solving the optimization problems. Minimum weight design of steel frames is aimed under the strength, displacement and size constraints. The geometric non-linearity of the frame members is taken into account in the optimum design algorithm. The performance of the ABC algorithm is tested on three steel frames taken from literature. The results obtained from the design examples demonstrate that the ABC algorithm could find better designs than other meta-heuristic optimization algorithms in shorter time.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000105.xml
|
||
ART001718421
|
oai_dc
|
Efficient and automated method of collapse assessment
|
Efficient and automated method of collapse assessment
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yongsheng Qi(Hohai University); Qiang Gu(Suzhou College of Science and Technology); Dong Li(Hohai University)"
] |
Seismic collapse analysis requires efficient and automated method to perform thousands of time history analyses. The paper introduced the advantages of speed and convergence property of explicit method, provided a few techniques to accelerate speed of calculation and developed an automated procedure for collapse assessment, which combines the strong capacity of commercial explicit finite element software and the flexible, intelligent specialties of control program written in FORTRAN language aiming at collapse analysis, so that tedious and heavy work of collapse analysis based on FEMAP695 can be easily implemented and resource of calculation can be made the best use of. All the key commands of control program are provided to help analyzers and engineers to cope with collapse assessment conveniently.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001718427
|
oai_dc
|
Uni-axial behaviour of normal-strength CFDST columns with external steel rings
|
Uni-axial behaviour of normal-strength CFDST columns with external steel rings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"C.X. Dong(The University of Hong Kong); J. C. M. Ho(The University of Hong Kong)"
] |
Concrete-filled-steel-tubular (CFST) columns have been well proven to improve effectively the strength, stiffness and ductility of concrete members. However, the central part of concrete in CFST columns is not fully utilised under uni-axial compression, bending and torsion. It has small contribution to both flexural and torsion strength, while it can be replaced effectively by steel with smaller area to give similar loadcarrying capacity. Also, the confining pressure in CFST columns builds up slowly because the initial elastic dilation of concrete is small before micro-crackings of concrete are developed. From these observations, it is convinced that the central concrete can be effectively replaced by another hollow steel tube with smaller area to form double-skinned concrete-filled-steel-tubular (CFDST) columns. In this study, a series of uni-axial compression tests were carried out on CFDST and CFST columns with and without external steel rings. From the test results, it was observed that on average that the stiffness and elastic strength of CFDST columns are about 25.8% and 33.4% respectively larger than CFST columns with similar equivalent area. The averaged axial load-carrying capacity of CFDST columns is 7.8% higher than CFST columns. Lastly, a theoretical model that takes into account the confining effects of steel tube and external rings for predicting the uni-axial load-carrying capacity of CFDST columns is developed.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001718415
|
oai_dc
|
Performance of fire damaged steel reinforced high strength concrete (SRHSC) columns
|
Performance of fire damaged steel reinforced high strength concrete (SRHSC) columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Eun Gyu Choi(Ewha Womans University); 김희선(이화여자대학교); 신영수(이화여자대학교)"
] |
In this study, an experimental study is performed to understand the effect of spalling on the structural behavior of fire damaged steel reinforced high strength concrete (SRHSC) columns, and the test results of temperature distributions and the displacements at elevated temperature are analyzed. Toward this goal, three long columns are tested to investigate the effect of various test parameters on structural behavior during the fire, and twelve short columns are tested to investigate residual strength and stiffness after the fire.
The test parameters are mixture ratios of polypropylene fiber (0 and 0.1 vol.%), magnitudes of applied loads (concentric loads and eccentric loads), and the time period of exposure to fire (0, 30, 60 and 90 minutes). The experimental results show that there is significant effect of loading on the structural behaviors of columns under fire. The loaded concrete columns result more explosive spalling than the unloaded columns under fire. In particular, eccentrically loaded columns are severely spalled. The temperature distributions of the concrete are not affected by the loading state if there is no spalling. However, the loading state affects the temperature distributions when there is spalling occurred. In addition, it is found that polypropylene fiber prevents spalling of both loaded and unloaded columns under fire. From these experimental findings, an equation of predicting residual load capacity of the fire damaged column is proposed.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001718418
|
oai_dc
|
Ultimate load capacity of unit Strarch frames using an explicit numerical method
|
Ultimate load capacity of unit Strarch frames using an explicit numerical method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kyoungsoo Lee(KAIST); Jung-Wuk Hong(KAIST); Sang-Eul Han(Inha University)"
] |
This study uses an explicit numerical algorithm to evaluate the ultimate load capacity analysis of a unit Strarch frame, accounting for the initial imperfection effects of the stress-erection process. Displacement-based filament beam element and an explicit dynamic relaxation method with kinetic damping are used to achieve the analysis. The section is composed of the finite number of filaments that can be conveniently modeled by various material models. Ramberg-Osgood and bilinear kinematic elastic plastic material models are formulated to analyze the nonlinear material behaviors of filaments. The numerical results obtained in the present study are compared with the results of experiment for stress-erection and buckling of unit Strarch frames.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001718413
|
oai_dc
|
Energy-based numerical evaluation for seismic performance of a high-rise steel building
|
Energy-based numerical evaluation for seismic performance of a high-rise steel building
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H.D. Zhang(Tianjin Institute of Urban Construction); Y.F. Wang(Beijing Jiaotong University)"
] |
As an alternative to current conventional force-based assessment methods, the energy-based seismic performance of a code-designed 20-storey high-rise steel building is evaluated in this paper. Using 3D nonlinear dynamic time-history method with consideration of additional material damping effect, the influences of different restoring force models and P-Δ /δ effects on energy components are investigated. By combining equivalent viscous damping and hysteretic damping ratios of the structure subjected to strong ground motions, a new damping model, which is amplitude-dependent, is discussed in detail. According to the analytical results, all energy components are affected to various extents by P-Δ /δ effects and a difference of less than 10% is observed; the energy values of the structure without consideration of P-Δ /δ effects are larger, while the restoring force models have a minor effect on seismic input energy with a difference of less than 5%, but they have a certain effect on both viscous damping energy and hysteretic energy with a difference of about 5~15%. The paper shows that the use of the hysteretic energy at its ultimate state as a seismic design parameter has more advantages than seismic input energy since it presents a more stable value. The total damping ratio of a structure consists of viscous damping ratio and hysteretic damping ratio and it is found that the equivalent viscous damping ratio is a constant for the structure, while the equivalent hysteretic damping ratio approximately increases linearly with structural response in elasto-plastic stage.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001718425
|
oai_dc
|
Tests on composite slabs and evaluation of relevant Eurocode 4 provisions
|
Tests on composite slabs and evaluation of relevant Eurocode 4 provisions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Thomas N. Salonikios(Institute of Engineering Seismology and Earthquake Engineering); Anastasios G. Sextos(Aristotle University of Thessaloniki); Andreas J. Kappos(Aristotle University of Thessaloniki)"
] |
The paper addresses some key issues related to the design of composite slabs with cold-formed profiled steel sheets. An experimental programme is first presented, involving six composite slab specimens tested with a view to evaluating Eurocode 4 (EC4) provisions on testing of composite slabs. In four specimens, the EC4-prescribed 5000 load cycles were applied using different load ranges resulting from alternative interpretations of the reference load Wt. Although the rationale of the application of cyclic loading is to induce loss of chemical bond between the concrete plate and the steel sheet, no such loss was noted in the tests for either interpretation of the range of load cycles. Using the recorded response of the specimens the values of factors m and k (related to interface shear transfer in the composite slab) were determined for the specific steel sheet used in the tests, on the basis of three alternative interpretations of the related EC4 provisions. The test results confirmed the need for a more unambiguous description of the m-k test and its interpretation in a future edition of the Code, as well as for an increase in the load amplitude range to be used in the cyclic loading tests, to make sure that the intended loss of bond between the concrete slab and the steel sheet is actually reached. The study also included the development of a special-purpose software that facilitates design of composite slabs; a parametric investigation of the importance of m-k values in slab design is presented in the last part of the paper.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001695440
|
oai_dc
|
Experimental study on laterally restrained steel columns with variable I cross sections
|
Experimental study on laterally restrained steel columns with variable I cross sections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ionel-Mircea Cristutiu(PUT); Daniel Luis Nunes(PUT); Adrian Ioan Dogariu(PUT)"
] |
Steel structural elements with web-tapered I cross section, are usually made of welded thin plates. Due to the nonrectangular shape of the element, thin web section may be obtained at the maximum cross section height. The buckling strength is directly influenced by lateral restraining, end support and initial imperfections. If no lateral restraints, or when they are not effective enough, the global behaviour of the members is characterized by the lateral torsional mode and interaction with sectional buckling modes may occur. Actual design codes do not provide a practical design approach for this kind of elements. The paper summarizes an experimental study performed by the authors on a relevant number of elements of this type. The purpose of the work was to evaluate the actual behaviour of the web tapered beam-columns when applying different types of lateral restraints and different web thickness.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001695444
|
oai_dc
|
Experimental investigation of inelastic buckling of built-up steel columns
|
Experimental investigation of inelastic buckling of built-up steel columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rami A. Hawileh(American University of Sharjah); Farid Abed(American University of Sharjah); Abu-Obeidah(American University of Sharjah); Jamal A. Abdalla(American University of Sharjah)"
] |
This paper experimentally investigated the buckling capacity of built-up steel columns mainly, Cruciform Columns (CC) and Side-to-Side (SS) columns fabricated from two Universal Beam (UB) sections. A series of nine experimental tests comprised of three UB sections, three CC sections and three SS sections with different lengths were tested to failure to measure the ultimate axial capacity of each column section. The lengths used for each category of columns were 1.8, 2.0, and 2.2 m with slenderness ratios ranging from 39–105. The measured buckling loads of the tested specimens were compared with the predicted ultimate axial capacity using Eurocode 3, AISC LRFD, and BS 5959-1. It was observed that the failure modes of the specimens included flexural buckling, local buckling and flexural-torsional buckling. The results showed that the ultimate axial capacity of the tested cruciform and side-by-side columns were higher than the code predicted design values by up to 20%, with AISC LRFD design values being the least conservative and the Eurocode 3 design values being the most conservative. This study has concluded that cruciform column and side-to-side welded flange columns using universal beam sections are efficient built-up sections that have larger ultimate axial load capacity, larger stiffness with saving in the weight of steel used compared to its equivalent universal beam counterpart.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001695442
|
oai_dc
|
Parametric study on bearing capacity of CFST members considering the concrete horizontal casting effect
|
Parametric study on bearing capacity of CFST members considering the concrete horizontal casting effect
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wenbo Sun(South China University of Technology); Yiqun Luo(South China University of Technology); Weijian Zhou(South China University of Technology); Wei Huang(Jinan University)"
] |
Concrete filled steel tubular (CFST) member has been widely used in the construction of highrise buildings for its high axial bearing capacity. It can also be applied on long-span structures such as spatial structures or bridges not only for its high bearing capacity but also for its construction convenience. Concrete casting effect of CFST member is considered in the study of its bearing capacity in this paper. Firstly, in order to authenticate the applicability of constitutive relationship and yield criterion of steel and concrete based on FEM, two ANSYS models are built to simulate and compared with other’s test. Secondly, in order to find the huge difference in bearing capacity due to different construction processes, two full-size CFST models are studied when they are horizontally cast and axially compressed. Finally, the effects of slenderness ratio (L/D) and confining parameter (D/t) of CFST members are studied to reveal the intrinsic links between bearing capacity and slenderness ratio or confining parameter.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001695441
|
oai_dc
|
Experimental investigation on flexural behaviour of HSS stud connected steel-concrete composite girders
|
Experimental investigation on flexural behaviour of HSS stud connected steel-concrete composite girders
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Amar Prakash(CSIR Campus); N.Anandavalli(CSIR Campus); C.K.Madheswaran(CSIR Campus); N.Lakshmanan(CSIR Campus)"
] |
In this paper, experimental investigations on high strength steel (HSS) stud connected steelconcrete composite (SCC) girders to understand the effect of shear connector density on their flexural behaviour is presented. SCC girder specimens were designed for three different shear capacities (100%, 85%,and 70%), by varying the number of stud connectors in the shear span. Three SCC girder specimens were tested under monotonic/quasi-static loading, while three similar girder specimens were subjected to nonreversal cyclic loading under simply supported end conditions. Details of casting the specimens, experimental set-up, and method of testing, instrumentation for the measurement of deflection, interface-slip and strain are discussed. It is found that SCC girder specimen designed for full shear capacity exhibits interface slip for loads beyond 25% of the ultimate load capacity. Specimens with lesser degree of shear connection show lower values of load at initiation of slip. Very good ductility is exhibited by all the HSS stud connected SCC girder specimens. It is observed that the ultimate moment of resistance as well as ductility gets reduced for HSS stud connected SCC girder with reduction in stud shear connector density. Efficiency factor indicating the effectiveness of high strength stud connectors in resisting interface forces is estimated to be 0.8 from the analysis. Failure mode is primarily flexure with fracturing of stud connectors and characterised by flexural cracking and crushing of concrete at top in the pure bending region. Local buckling in the top flange of steel beam was also observed at the loads near to failure, which is influenced by spacing of studs and top flange thickness of rolled steel section. One of the recommendations is that the ultimate load capacity can be limited to 1.5 times the plastic moment capacity of the section such that the post peak load reduction is kept within limits. Load-deflection behaviour for monotonic tests compared well with the envelope of load-deflection curves for cyclic tests. It is concluded from the experimental investigations that use of HSS studs will reduce their numbers for given loading, which is advantageous in case of long spans. Buckling of top flange of rolled section is observed at failure stage. Provision of lips in the top flange is suggested to avoid this buckling. This is possible in case of longer spans, where normally built-up sections are used.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001695439
|
oai_dc
|
Thermal buckling load optimization of laminated plates with different intermediate line supports
|
Thermal buckling load optimization of laminated plates with different intermediate line supports
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Umut Topal(Karadeniz Technical University)"
] |
This paper deals with critical thermal buckling load optimization of symmetrically laminated four layered angle-ply plates with one or two different intermediate line supports. The design objective is the maximization of the critical thermal buckling load and a design variable is the fibre orientation in the layers. The first order shear deformation theory and nine-node isoparametric finite element model are used for the finite element solution of the laminates. The modified feasible direction (MFD) method is used for the optimization routine. For this purpose, a program based on FORTRAN is used. Finally, the numerical analysis is carried out to investigate the effects of location of the internal line supports, plate aspect ratios and boundary conditions on the optimal designs and the results are compared.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001695443
|
oai_dc
|
Numerical analysis of the axially loaded concrete filled steel tube columns with debonding separation at the steel-concrete interface
|
Numerical analysis of the axially loaded concrete filled steel tube columns with debonding separation at the steel-concrete interface
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chen Shiming(Tongji University); Zhang Huifeng(Tongji University)"
] |
The interaction between steel tube and concrete core is the key design considerations for concrete-filled steel tube columns. In a concrete-filled steel tube (CFST) column, the steel tube provides confinement to the concrete core which permits the composite action among the steel tube and the concrete. Due to construction faults and plastic shrinkage of concrete, the debonding separation at the steel-concrete interface weakens the confinement effect, and hence affects the behaviour and bearing capacity of the composite member. This study investigates the axial loading behavior of the concrete filled circular steel tube columns with debonding separation. A three-dimensional nonlinear finite element model of CFST composite columns with introduced debonding gap was developed. The results from the finite element analysis captured successfully the experimental behaviours. The calibrated finite element models were then utilized to assess the influence of concrete strength, steel yield stress and the steel-concrete ratio on the debonding behaviour. The findings indicate a likely significant drop in the load carrying capacity with the increase of the size of the debonding gap. A design formula is proposed to reduce the load carrying capacity with the presence of debonding separation.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001705447
|
oai_dc
|
Experimental study on ductile crack initiation in compact section steel columns
|
Experimental study on ductile crack initiation in compact section steel columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xiaoqun Luo(Tongji University); Hanbin Ge(Meijo University); Masatoshi Ohashi(Central Japan Railway Company)"
] |
In order to develop a verification method for extremely low cycle fatigue (ELCF) of steel structures, the initiation mechanism of ductile cracks is investigated in the present study, which is the first step of brittle fracture, occurred in steel bridge piers with thick-walled sections. For this purpose, a total of six steel columns with small width-thickness ratios were tested under cyclic loading. It is found that ductile cracks occurred at the column base in all the specimens regardless of cyclic loading histories subjected. Moreover, strain history near the crack initiation location is illustrated and an index of energy dissipation amount is proposed to evaluate deformation capacity of structures.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001705444
|
oai_dc
|
Dynamic analysis and shear connector damage identification of steel-concrete composite beams
|
Dynamic analysis and shear connector damage identification of steel-concrete composite beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhongming Hou(Beijing Jiaotong University); He Xia(Beijing Jiaotong university); YanLing Zhang(Shijiazhuang Tiedao University)"
] |
With the advantages of large span, light deadweight and convenient construction, the steelconcrete composite beam (SCCB) has been rapidly developed as a medium span bridge. Compared with common beams, the global stiffness of SCCB is discontinuous and in a staged distribution. In this paper, the analysis model for the simply-supported SCCB is established and the vibration equations are derived. The natural vibration characteristics of a simply-supported SCCB are analyzed, and are compared with the theoretical and experimental results. A curvature mode measurement method is proposed to identify the shear connector damage of SCCB, with the stiffness reduction factor to describe the variation of shear connection stiffness. By analysis on the 1st to 3rd vertical modes, the distribution of shear connectors between the steel girder and the concrete slab are well identified, and the damage locations and failure degrees are detected. The results show that the curvature modes can be used for identification of the damage location.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001705446
|
oai_dc
|
Buckling behavior of strengthened perforated plates under shear loading
|
Buckling behavior of strengthened perforated plates under shear loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bin Cheng(Shanghai Jiao Tong University); Chun Li(Shanghai Jiao Tong University)"
] |
This paper is dedicated to the buckling behaviors of strengthened perforated plates under edge shear loading, which is a typical load pattern of steel plates in civil engineering, especially in plate and box girders. The square plates considered each has a centric circular hole and is simply supported on four edges in the out-of-plane direction. Three types of strengthening stiffeners named ringed stiffener (RS), flat stiffener (FSA and FSB) and strip stiffener (SSA, SSB and SSC) are mainly discussed. The finite element method (FEM) has been employed to analyse the elastic and elasto-plastic buckling behavior of unstrengthened and strengthened perforated plates. Results show that most of the strengthened perforated plates behave higher buckling strengths than the unstrengthened ones, while the enhancements in elastic buckling stress and elastoplastic ultimate strength are closely related to stiffener types as well as plate geometric parameters including plate slenderness ratio and hole diameter to plate width ratio. The critical slenderness ratios of shear loaded strengthened perforated plates, which determine the practical buckling pattern (i.e., elastic or elasto-plastic buckling) of the plates, are also studied. Based on the contrastive analyses of strengthening efficiency considering the influence of stiffener consumption, the most efficient cutout-strengthening methods for shear loaded perforated square plates with different slenderness ratios and circular hole diameter to plate width ratios are preliminarily identified.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001705445
|
oai_dc
|
Experimental and theoretical behaviour analysis of steel suspension members subjected to tension and bending
|
Experimental and theoretical behaviour analysis of steel suspension members subjected to tension and bending
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Stanislav Kmet(Technical University of Kosice); Michal Tomko(Technical University of Kosice); Molinne Bin(Technical University of Kosice)"
] |
Steel suspension members subjected to tension and bending offer an economical and efficient alternative for many structural problems. This paper is concerned with the elastic and elastic-plastic behaviour of suspension members with bending stiffness subjected to vertical point and uniformly distributed loads. An experimental study is described which focuses on the response of three suspension members with various Tshaped steel hot rolled sections and geometric configurations. The tests enable direct assessment of the influence of a key parameter such as the sag-to-span ratio on the response of suspension members. Detailed nonlinear finite-element models are generated to provide a tool for theoretical analyses and to facilitate further understanding of the behaviour. Results demonstrate that experimentally obtained responses can generally be closely predicted numerically because there are relatively good agreements between finite element and tests results. The results and observations of subsequent numerical parametric studies offer an insight into the key factors that govern the behaviour of suspension members with bending stiffness in the elastic-plastic range.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001705448
|
oai_dc
|
Seismic analysis of CFST frames considering the effect of the floor slab
|
Seismic analysis of CFST frames considering the effect of the floor slab
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Huang Yuan(Hunan University); Yi Weijian(Hunan University); Nie Jianguo(Tsinghua University)"
] |
This paper describes the refined 3-D finite element (FE) modeling of composite frames composed of concrete-filled steel tubular (CFST) columns and steel-concrete composite beams based on the test to get a better understanding of the seismic behavior of the steel-concrete composite frames. A number of material nonlinearities and contact nonlinearities, as well as geometry nonlinearities, were taken into account. The elastoplastic behavior, as well as fracture and post-fracture behavior, of the FE models were in good agreement with those of the specimens. Besides, the beam and panel zone deformation of the analysis models fitted well with the corresponding deformation of the specimens. Parametric studies were conducted based on the refined finite elememt (FE) model. The analyzed parameters include slab width, slab thickness, shear connection degree and axial force ratio. The influences of these parameters, together with the presence of transverse beam, on the seismic behavior of the composite frame were studied. And some advices for the corresponding seismic design provisions of composite structures were proposed.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001705443
|
oai_dc
|
Determination of limiting temperatures for H-section and hollow section columns
|
Determination of limiting temperatures for H-section and hollow section columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"권인규(강원대학교); 권영봉(영남대학교)"
] |
The risk of progressive collapse in steel framed buildings under fire conditions is gradually rising due to the increasing use of combustible materials. The fire resistance of such steel framed buildings is evaluated by fire tests. Recently, the application of performance based fire engineering makes it easier to evaluate the fire resistance owing to various engineering techniques and fire science. The fire resistance of steel structural members can be evaluated by the comparison of the limiting temperatures and maximum temperatures of structural steel members. The limiting temperature is derived at the moment that the failure of structural member results from the rise in temperature and the maximum temperature is calculated by using a heat transfer analysis. To obtain the limiting temperatures for structural steel of grades SS400 and SM490 in Korea, tensile strength tests of coupons at high temperature were conducted. The limiting temperatures obtained by the tensile coupon tests were compared with the limiting temperatures reported in the literature and the results of column fire tests under four types of loading with different load ratios. Simple limiting temperature formulas for SS400 and SM490 steel based on the fire tests of the tensile coupons are proposed. The limiting temperature predictions using the proposed formulas were proven to be conservative in comparison with those obtained from H-section and hollow section column fire tests.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001633302
|
oai_dc
|
Thermal buckling analysis of shear deformable laminatedorthotropic plates by differential quadrature
|
Thermal buckling analysis of shear deformable laminatedorthotropic plates by differential quadrature
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Moradi(Shahid Chamran University); Mohammad Hassan Mansouri(Isfahan)"
] |
In this paper, the thermal buckling analysis of rectangular composite laminated plates is investigated using the Differential Quadrature (DQ) method. The composite plate is subjected to a uniform temperature distribution and arbitrary boundary conditions. The analysis takes place in two stages. First, pre-buckling forces due to a temperature rise are determined by using a membrane solution. In the second stage, the critical temperature is predicted based on the first-order shear deformation theory. To verify the accuracy of the method, several case studies were used and the numerical results were compared with those of other published literatures. Moreover, the effects of several parameters such as aspect ratio, fiber orientation, modulus ratio, and various boundary conditions on the critical temperature were examined. The results confirm the efficiency and accuracy of the DQ method in dealing with this class of engineering problems.
|
토목공학
| null |
kci_detailed_000105.xml
|
|||
ART001633301
|
oai_dc
|
Effect of volume fraction on stability analysis of glass fibre reinforced composite plate
|
Effect of volume fraction on stability analysis of glass fibre reinforced composite plate
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K.M.Mini(Amrita Vishwa Vidyapeetham); Mahadevan Lakshmanan(Amrita Vishwa Vidyapeetham); Lubin Mathew(Amrita Vishwa Vidyapeetham); Girish Kaimal(Amrita Vishwa Vidyapeetham)"
] |
This paper deals with an experimental investigation to study the effect of fibre content on the stability of composite plates with various aspect ratios. Epoxy based glass fibre reinforced composite plates with aspect ratio varying from 0.4 to 1 and with volume fractions of 0.36, 0.4, 0.46, 0.49 and 0.55 are used for the investigation. From the study it is observed that for plate with aspect ratio of 0.5 and 0.4 there is no buckling and the plate got crushed at the middle. As the volume fraction increases the buckling load also increases to a limit and then began to reduce with further increase in fibre content. The optimum range of fibre content for maximum stability is found between 0.49 and 0.55. Polynomial expressions are developed for the study of buckling behaviour of composite plates with different volume fractions in terms of load and aspect ratio.
|
토목공학
| null |
kci_detailed_000106.xml
|
|||
ART001633300
|
oai_dc
|
3D Finite element analysis of end - plate steel joints
|
3D Finite element analysis of end - plate steel joints
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"G.A. Drosopoulos(Technical University of Crete); G.E. Stavroulakis(Technical University of Crete); K.M. Abdalla(Jordan University of Science & Technology)"
] |
This paper presents a numerical investigation of the mechanical behaviour of extended end - plate steel connections including comparison with full size experiments. Contact and friction laws have been taken into account with nonlinear, three dimensional finite element analysis. Material and geometric nonlinearities have been implemented to the model, as well. Results are then compared with experimental tests conducted at the Jordan University of Science and Technology. According to the most significant observation of the analysis, a separation of the column flange from the extended end - plate occurs. Other important structural parameters of the connection, like the impact of some column stiffeners on the overall response, local buckling of the column and friction of the beam to column interface, have been examined as well.
|
토목공학
| null |
kci_detailed_000106.xml
|
|||
ART001633303
|
oai_dc
|
Shear behaviour of RC T-beams strengthenedwith U-wrapped GFRP sheet
|
Shear behaviour of RC T-beams strengthenedwith U-wrapped GFRP sheet
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K.C.Panda(SOA University); S. K. Bhattacharyya(CSIR-Central Building Research Institute); S. V. Barai(IIT Kharagpur)"
] |
This paper presents an experimental investigation on the performance of 2.5 m long reinforced concrete (RC) T-beams strengthened in shear using epoxy bonded glass fibre fabric. Eighteen (18) full scale, simply supported RC T-beams are tested. Nine beams are used as control beam specimens with three different stirrups spacing without glass fibre reinforced polymer (GFRP) sheet and rest nine beams are strengthened in shear with one, two, and three layers of GFRP sheet in the form of U-jacket around the web of T-beams for each type of stirrup spacing. The objective of this study is to evaluate the effectiveness, the cracking pattern and modes of failure of the GFRP strengthened RC T-beams. The test result indicates that for RC T-beams strengthened in shear with U-jacketed GFRP sheets, increase the load carrying capacity by 10-46%.
|
토목공학
| null |
kci_detailed_000106.xml
|
|||
ART001633304
|
oai_dc
|
Structural analysis of circular UHPCC form for hybrid pier under construction loads
|
Structural analysis of circular UHPCC form for hybrid pier under construction loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"X.G. Wu(Harbin Institute of Technology); X.Y. Zhao(Harbin Engineering University); S.M. Han(Kumoh National Institute of Technology)"
] |
Ultra high performance cementitious composite material is applied to the design of multifunctional permanent form for bridge pier in this paper. The basic properties and calculating constitutive model of ultra high performance cementitious composite are introduced briefly. According to momental theory of thin-walled shell, the analytical solutions of structural behavior parameters including circumferential stress, longitudinal stress and shear stress are derived for UHPCC thin-walled circular tube. Based on relevant code of construction loads (MHURD of PPC 2008), the calculating parameter expression of construction loads for UHPCC thinwalled circular tube is presented. With geometrical dimensions of typical pier, the structural behavior parameters of UHPCC tube under construction loads are calculated. The effects of geometrical parameters of UHPCC tube on structural behavior are analyzed and the design advices for UHPCC tube are proposed. This paper shall provide a scientific reference for UHPCC permanent form design and UHPCC hybrid structure application.
|
토목공학
| null |
kci_detailed_000106.xml
|
|||
ART001685948
|
oai_dc
|
Flexural behaviour of steel plate-masonry composite beams
|
Flexural behaviour of steel plate-masonry composite beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Deng-Hu Jing(Southeast University); Shuang-Yin Cao(Southeast University); Lei Shi(Green Town Architecture Design Co., Ltd.,)"
] |
Steel plate-masonry composite structure is a newly-developed type of structural technique applicable to existing masonry buildings by which the load-bearing walls can be removed for large spaces. This kind of structure has been used in practice for its several advantages, but experimental investigation on its elements is nearly unavailable in existing literature. This paper presents an experimental study on the flexural behaviour of four steel plate-masonry composite beams loaded by four-point bending. Test results indicate that failure of the tested beams always starts from the local buckling of steel plate, and that the tested beams can satisfy the requirement of service limit state. In addition, the assumption of plane section is still remained for steel plate prior to local buckling or steel yielding. By comparative analyses, it was also verified that the working performance of the beam is influenced by the cross-section of steel plate, which can be efficiently enhanced by epoxy adhesive rather than cement mortar or nothing at all. Besides, it was also found that the contribution of the encased masonry to the flexural capacity of the composite beam cannot be ignored when the beam is injected with epoxy adhesive.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000106.xml
|
||
ART001685949
|
oai_dc
|
Improving a current method for predicting walking-induced floor vibration
|
Improving a current method for predicting walking-induced floor vibration
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"T.H. Nguyen(Swinburne University of Technology); E. F. Gad(Swinburne University of Technology); J.L. Wilson(Swinburne University of Technology); N. Haritos(The University of Melbourne)"
] |
Serviceability rather than strength is the most critical design requirement for vibrationvulnerable floor constructions. Annoying vibrations due to normal walking activity have been observed more frequently on long-span lightweight floor systems in office and commercial retail buildings, raising the need for the development of floor vibration design procedures. This paper highlights some limitations of one of the most commonly used guidelines AISC/CISC DG11, and proposes improvements to this method. Design charts and approximate closed form formulas to estimate the walking response are developed in which various factors relating to the dynamic characteristics of both the floor and the excitation are considered. The accuracy of the proposed formulas and other proposals found in the literature is examined. The proposed modifications would be significant, especially with long-span floors where vibration levels may be underestimated by the current design procedure. The application of the proposed prediction method is illustrated by worked examples that reveal a good agreement with results obtained from finite element analyses and experiments. The presented work would enhance the accuracy and maintain the simplicity and convenience of the design guideline.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000106.xml
|
||
ART001685936
|
oai_dc
|
Reliability analysis of steel cable-stayed bridges including soil-pile interaction
|
Reliability analysis of steel cable-stayed bridges including soil-pile interaction
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jin Cheng(Tongji University); Xiao-luan Liu(Tongji University)"
] |
An efficient and accurate algorithm is proposed to evaluate the reliability of cable-stayed bridges accounting for soil-pile interaction. The proposed algorithm integrates the finite-element method and the response surface method. The finite-element method is used to model the cable-stayed bridge including soilpile interaction. The reliability index is evaluated based on the response surface method. Uncertainties in the superstructure, the substructure and load parameters are incorporated in the proposed algorithm. A long span steel cable-stayed bridge with a main span length of 1088 m built in China is considered as an illustrative example. The reliability of the bridge is evaluated for the strength and serviceability performance functions.
Results of the study show that when strength limit states for both girder and tower are considered, soil-pile interaction has significant effects on the reliability of steel cable-stayed bridges. Further, a detailed sensitivity study shows that the modulus of subgrade reaction is the most important soil-pile interaction-related parameter influencing the reliability of steel cable-stayed bridges.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000106.xml
|
||
ART001685951
|
oai_dc
|
Simple equations for the calculation of the temperature within the cross-section of slim floor beams under ISO Fire
|
Simple equations for the calculation of the temperature within the cross-section of slim floor beams under ISO Fire
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"R. Zaharia(The Politehnica University of Timisoara); J. M. Franssen(University of Liege)"
] |
The calculation of fire resistance for a composite structural element comprises the calculation of the temperature within its cross-section and of the load bearing capacity, considering the evolution of the steel and concrete mechanical properties, function of the temperature. The paper proposes a method to calculate the bending capacity under ISO fire, for Slim Floor systems using asymmetric steel beams, with a wider lower flange or a narrow upper flange welded onto a half hot-rolled profile. The temperatures in the cross-section are evaluated by means of empirical formulas determined through a parametrical analysis, performed with the special purpose non-linear finite element program SAFIR. Considering these formulas, the bending capacity may be calculated, using an analytical approach to determine the plastic bending moment, for different fire resistance demands. The results obtained with this simplified method are validated through numerical analysis.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000106.xml
|
||
ART001685950
|
oai_dc
|
Buckling and stability of elastic-plastic sandwich conical shells
|
Buckling and stability of elastic-plastic sandwich conical shells
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jerzy Zielnica(Poznan University of Technology)"
] |
Shell structures are very interesting from the design point of view and these are well recognized in the scientific literature. In this paper the analysis of the buckling loads and stability paths of a sandwich conical shell with unsymmetrical faces under combined load based on the assumptions of moderately large deflections (geometrically nonlinear theory) is considered and elastic-plastic properties of the material of the faces are taken into considerations. External load is assumed to be two-parametrical one and it is assumed that the shell deforms into the plastic range before buckling. Constitutive relations in the analysis are those of the Nadai-Hencky deformation theory of plasticity and Prandtl-Reuss plastic flow theory with the H-M-H (Huber-Mises-Hencky) yield condition. The governing stability equations are obtained by strain energy approach and Ritz method is used to solve the equations with the help of analytical-numerical methods using computer.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000106.xml
|
||
ART001685952
|
oai_dc
|
Numerical analysis of center cracked orthotropic fgm plate: Crack and material axes differ by θo
|
Numerical analysis of center cracked orthotropic fgm plate: Crack and material axes differ by θo
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mete Onur Kaman(Firat University); Fatih Cetisli(Firat University)"
] |
In this study, fracture analysis of orthotropic FGM (Functionally Graded Material) plate having center crack is performed, numerically. Material axis arbitrarily oriented and there is an angle θo between material and crack axes. Stress intensity factors at the crack tips for Mode I are calculated using Displacement Correlation Method (DCM). In numerical analysis, effects of material properties and variation of angle θo between material and crack axes on the fracture behavior are investigated for four different boundary conditions. Consequently, it is found that the effect of θo on stress intensity factor depends on variation of material properties.
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000106.xml
|
||
ART001578795
|
oai_dc
|
Fire performance of concrete-filled steel tubular columns strengthened by CFRP
|
Fire performance of concrete-filled steel tubular columns strengthened by CFRP
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhong Tao(College of Civil Engineering and Architecture, Fuzhou University); Zhi-Bin Wang(Fuzhou University); Lin-Hai Han(College of Civil Engineering and Architecture, Fuzhou University); Brian Uy(School of Civil and Environmental Engineering, The University of New South Wales)"
] |
With the increasing use of concrete-filled steel tubes (CFST) as structural members, there is a growing need to provide suitable measures for possible strengthening or repair of these kinds of structural elements. Fibre reinforced polymer (FRP) jacketing is a recent method and is particularly attractive in which it does not significantly increase the section size, and is relatively easy to install. Thus, it can be used to enhance strength and/or ductility of CFST members. Very little information is available on the performance of FRP-strengthened CFST members under fire conditions. This paper is an attempt to study the fire performance of CFST columns strengthened by FRP. The results of fire endurance tests on FRP-strengthened circular CFST columns are presented. Failure modes of the specimens after exposure to fire, temperatures in the cross section, axial deformation and fire resistance of the composite columns are analysed. It is demonstrated that the required fire endurance can be achieved if the strengthened composite columns are appropriately designed.
|
토목공학
| null |
kci_detailed_000106.xml
|
|||
ART001578787
|
oai_dc
|
Experimental study on two types of newbeam-to-column connections
|
Experimental study on two types of newbeam-to-column connections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hongwei Ma(South China University of Technology); Weishan Jiang(Xi’an University of Architecture & Technology); 조종두(인하대학교)"
] |
The new structure consisting of continuous compound spiral hoop reinforced concrete (CCSHRC)column and steel concrete composite (SCC) beam has both the advantages of steel structures and concrete structures. Two types of beam-to-column connections applied in this structural system are presented in this paper. The connection details are as follows: the main bars in beam concrete pass through the core zone for both types of connections. For connecting bar connection, the steel I-beam webs are connected by bolts to a steel plate passing through the joint while the top and bottom flanges of the beams are connected by four straight and two X-shaped bars. For bolted end-plate connection, the steel I-beam webs are connected by stiffenedextended end-plates and eight long shank bolts passing through the core zone. In order to study the seismic behaviour and failure mechanisms of the connections, quasi-static tests were conducted on both types of full-scale connection subassemblies and core zone specimens. The load-drift hysteresis loops show a plateau for the connecting bar connection while they are excellent plump for bolted end-plate connection. The shear capacity formulas of both types of connections are presented and the values calculated by the formula agree well with the test results.
|
토목공학
| null |
kci_detailed_000106.xml
|
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