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Jun-seong Choi - One of the best experts on this subject based on the ideXlab platform.
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earthquake response analysis of the hualien soil structure interaction system based on updated soil properties using forced vibration Test data
Earthquake Engineering & Structural Dynamics, 2001Co-Authors: Jun-seong Choi, Chung Bang Yun, Jaemin KimAbstract:This paper presents results of the earthquake response analysis on a large-scale Seismic Test (LSST) structure which was built at Hualien in Taiwan for an international cooperative research project. The analysis is carried out using a computer program which has been developed based on axisymmetric finite element method incorporating dynamic infinite elements for far-field soil region and a substructured wave input technique. The non-linear behaviour of the soil medium is taken into account using an iterative equivalent linearization procedure. Two sets of the soil and structural properties, namely the unified and the FVT-correlated models, are utilized as the initial linear values. The unified model was provided by a group of experts in charge of the geotechnical experiments, and the correlated model was obtained through a system identification procedure using the forced vibration Test (FVT) results by the present authors. Three components of ground accelerations are artificially generated through an averaging process of the Fourier amplitude spectra of the ground accelerations measured near the Test structure, and they are used as the control input motions for the earthquake analysis. It has been found that the earthquake responses predicted using the generated control motions and with the FVT-correlated model as the initial linear properties in the equivalent linearization procedure compare very well with the observed responses. Copyright © 2001 John Wiley & Sons, Ltd.
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Identification of the Hualien soil-structure interaction system
Soil Dynamics and Earthquake Engineering, 1999Co-Authors: Chung Bang Yun, Jun-seong Choi, J-m. KimAbstract:This article demonstrates how system identification techniques can be successfully applied to a soil-structure interaction system in conjunction with the results of the forced vibration Tests on the Hualien large-scale Seismic Test structure which was recently built in Taiwan for an international joint research. The parameters identified are the shear moduli of several near-field soil regions as well as Young's moduli of the shell sections of the structure. The soil-structure interaction system is represented by the finite element method combined with infinite element formulation for the unbounded layered soil medium. Preliminary investigations are carried out on the results of the static stress analysis for the soil medium and the results of the in-situ Tests to divide the soil-structure system into several regions with homogeneous properties and to determine the lower and upper bounds of the parameters for the purpose of identification. Then two sets of parameters are identified for two principal directions based on the forced vibration Test data by minimizing the estimation error using the constrained steepest descent method. The simulated responses for the forced vibration Tests using the identified parameters show excellent agreement with the Test data. The present estimated parameters are also found to be well compared with the average value of those by other researchers in the joint project.
Chung Bang Yun - One of the best experts on this subject based on the ideXlab platform.
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earthquake response analysis of the hualien soil structure interaction system based on updated soil properties using forced vibration Test data
Earthquake Engineering & Structural Dynamics, 2001Co-Authors: Jun-seong Choi, Chung Bang Yun, Jaemin KimAbstract:This paper presents results of the earthquake response analysis on a large-scale Seismic Test (LSST) structure which was built at Hualien in Taiwan for an international cooperative research project. The analysis is carried out using a computer program which has been developed based on axisymmetric finite element method incorporating dynamic infinite elements for far-field soil region and a substructured wave input technique. The non-linear behaviour of the soil medium is taken into account using an iterative equivalent linearization procedure. Two sets of the soil and structural properties, namely the unified and the FVT-correlated models, are utilized as the initial linear values. The unified model was provided by a group of experts in charge of the geotechnical experiments, and the correlated model was obtained through a system identification procedure using the forced vibration Test (FVT) results by the present authors. Three components of ground accelerations are artificially generated through an averaging process of the Fourier amplitude spectra of the ground accelerations measured near the Test structure, and they are used as the control input motions for the earthquake analysis. It has been found that the earthquake responses predicted using the generated control motions and with the FVT-correlated model as the initial linear properties in the equivalent linearization procedure compare very well with the observed responses. Copyright © 2001 John Wiley & Sons, Ltd.
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Identification of the Hualien soil-structure interaction system
Soil Dynamics and Earthquake Engineering, 1999Co-Authors: Chung Bang Yun, Jun-seong Choi, J-m. KimAbstract:This article demonstrates how system identification techniques can be successfully applied to a soil-structure interaction system in conjunction with the results of the forced vibration Tests on the Hualien large-scale Seismic Test structure which was recently built in Taiwan for an international joint research. The parameters identified are the shear moduli of several near-field soil regions as well as Young's moduli of the shell sections of the structure. The soil-structure interaction system is represented by the finite element method combined with infinite element formulation for the unbounded layered soil medium. Preliminary investigations are carried out on the results of the static stress analysis for the soil medium and the results of the in-situ Tests to divide the soil-structure system into several regions with homogeneous properties and to determine the lower and upper bounds of the parameters for the purpose of identification. Then two sets of parameters are identified for two principal directions based on the forced vibration Test data by minimizing the estimation error using the constrained steepest descent method. The simulated responses for the forced vibration Tests using the identified parameters show excellent agreement with the Test data. The present estimated parameters are also found to be well compared with the average value of those by other researchers in the joint project.
Jaemin Kim - One of the best experts on this subject based on the ideXlab platform.
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earthquake response analysis of the hualien soil structure interaction system based on updated soil properties using forced vibration Test data
Earthquake Engineering & Structural Dynamics, 2001Co-Authors: Jun-seong Choi, Chung Bang Yun, Jaemin KimAbstract:This paper presents results of the earthquake response analysis on a large-scale Seismic Test (LSST) structure which was built at Hualien in Taiwan for an international cooperative research project. The analysis is carried out using a computer program which has been developed based on axisymmetric finite element method incorporating dynamic infinite elements for far-field soil region and a substructured wave input technique. The non-linear behaviour of the soil medium is taken into account using an iterative equivalent linearization procedure. Two sets of the soil and structural properties, namely the unified and the FVT-correlated models, are utilized as the initial linear values. The unified model was provided by a group of experts in charge of the geotechnical experiments, and the correlated model was obtained through a system identification procedure using the forced vibration Test (FVT) results by the present authors. Three components of ground accelerations are artificially generated through an averaging process of the Fourier amplitude spectra of the ground accelerations measured near the Test structure, and they are used as the control input motions for the earthquake analysis. It has been found that the earthquake responses predicted using the generated control motions and with the FVT-correlated model as the initial linear properties in the equivalent linearization procedure compare very well with the observed responses. Copyright © 2001 John Wiley & Sons, Ltd.
Robert Tremblay - One of the best experts on this subject based on the ideXlab platform.
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Seismic performance of a 3d full scale high ductile steel concrete composite moment resisting frame part ii Test results and analytical validation
Earthquake Engineering & Structural Dynamics, 2008Co-Authors: A Braconi, Oreste S Bursi, Giovanni Fabbrocino, Walter Salvatore, F Taucer, Robert TremblayAbstract:This paper presents the results of a multi-level pseudo-dynamic Seismic Test program that was performed to assess the performance of a full-scale three-bay, two-storey steel-concrete composite moment-resisting frame built with partially encased composite columns and partial-strength beam-to-column joints. The system was designed to develop a ductile response in the joint components of beam-to-column joints including flexural yielding of beam end plates and shear yielding of the column web panel zone. The ground motion producing the damageability limit state interstorey drift caused minor damage while the ultimate limit state ground motion level entailed column web panel yielding, connection yielding and plastic hinging at the column base connections. The earthquake level chosen to approach the collapse limit state induced more damage and was accompanied by further column web panel yielding, connection yielding and inelastic phenomena at column base connections without local buckling. During the final quasi-static cyclic Test with stepwise increasing displacement-amplitudes up to an interstorey drift angle of 4.6%, the behaviour was ductile although cracking of beam-to-end-plate welds was observed. Correlations with numerical simulations taking into account the inelastic cyclic response of beam-to-column and column base joints are also presented in the paper together. Inelastic static pushover and time history analysis procedures are used to estimate the structural behaviour and overstrength factors of the structural system under study.
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Seismic Testing and performance of buckling restrained bracing systems
Canadian Journal of Civil Engineering, 2006Co-Authors: Robert Tremblay, P Bolduc, R Neville, Ronald H DevallAbstract:This paper describes a subassemblage Seismic Test program performed on six buckling-restrained braces (BRBs). Two different brace core segment lengths and two different buckling-restraining mechani...
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Seismic Testing and performance of buckling restrained bracing systems
Canadian Journal of Civil Engineering, 2006Co-Authors: Robert Tremblay, P Bolduc, R Neville, Ronald H DevallAbstract:This paper describes a subassemblage Seismic Test program performed on six buckling-restrained braces (BRBs). Two different brace core segment lengths and two different buckling-restraining mechanisms were examined. The applied loading histories included a qualifying quasi-static cyclic Test with stepwise incremental displacement amplitudes and a dynamically applied Seismic loading. A Test was also carried out on a conventional bracing member for comparison purposes. The concrete-filled tube specimens exhibited satisfactory performance under the quasi-static loading protocol, regardless of the length of the core segment. Strain hardening and frictional responses resulted in brace axial forces significantly exceeding the core yield capacity. The steel BRB system exhibited good performance under the quasi-static and dynamic loading sequences, provided that the clearance between the brace core and the buckling-restrained mechanism was kept to a minimum. The dynamic loading protocol was less severe for low-cy...
Tara C Hutchinson - One of the best experts on this subject based on the ideXlab platform.
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preTest nonlinear finite element modeling and response simulation of a full scale 5 story reinforced concrete building Tested on the nees ucsd shake table
Journal of Structural Engineering-asce, 2018Co-Authors: Hamed Ebrahimian, Rodrigo Astroza, Joel P Conte, Tara C HutchinsonAbstract:A full-scale five-story reinforced concrete building specimen, outfitted with a variety of nonstructural components and systems (NCSs), was built and Tested on the Network for Earthquake Engineering Simulation at the University of California, San Diego (NEES–UCSD) large outdoor shake table in the period March 2011–June 2012. The building specimen was subjected to a sequence of dynamic Tests including scaled and unscaled earthquake motions. A detailed three-dimensional nonlinear finite-element (FE) model of the structure was developed and used for preTest response simulations to predict the Seismic response of the Test specimen and for decision support in defining the Seismic Test protocol and selecting the instrumentation layout for both the structure and NCSs. This paper introduces the building specimen and the shake table Test protocol and describes the techniques used for the nonlinear FE modeling and response simulation. Utilized as blind prediction, the preTest simulation results at different scales (global structural level and local member/section/fiber levels) are compared with their experimental counterparts for Seismic input (base excitation) of increasing intensity from serviceability to design levels. The predictive capabilities of the used FE modeling techniques are evaluated and possible sources of discrepancies between the FE predictions and experimental measurements are investigated and discussed.