The seismic performance of a self-centering precast reinforced concrete （RC） frame with shear walls was investigated in this paper. The lateral force resistance was provided by self-centering precast RC shear walls ...The seismic performance of a self-centering precast reinforced concrete （RC） frame with shear walls was investigated in this paper. The lateral force resistance was provided by self-centering precast RC shear walls （SPCW）, which utilize a combination ofunbonded prestressed post-tensioned （PT） tendons and mild steel reinforcing bars for flexural resistance across base joints. The structures concentrated deformations at the bottom joints and the unbonded PT tendons provided the self-centering restoring force. A 1/3-scale model of a five-story self-centering RC frame with shear walls was designed and tested on a shake-table under a series of bi-directional earthquake excitations with increasing intensity. The acceleration response, roof displacement, inter-story drifts, residual drifts, shear force ratios, hysteresis curves, and local behaviour of the test specimen were analysed and evaluated. The results demonstrated that seismic performance of the test specimen was satisfactory in the plane of the shear wall; however, the structure sustained inter-story drift levels up to 2.45%. Negligible residual drifts were recorded after all applied earthquake excitations. Based on the shake-table test results, it is feasible to apply and popularize a self-centering precast RC frame with shear walls as a structural system in seismic regions.展开更多
Balloon type cross laminated timber(CLT)rocking shear walls are a novel seismic force resisting system.In this paper,the seismic performance of four 12-story balloon type CLT rocking shear walls,designed by a structur...Balloon type cross laminated timber(CLT)rocking shear walls are a novel seismic force resisting system.In this paper,the seismic performance of four 12-story balloon type CLT rocking shear walls,designed by a structural engineering firm located in Vancouver(Canada)using the performance-based design procedure outlined in the technical guideline published by the Canadian Construction Materials center(CCMC)/National Research Council Canada(NRC),is assessed.The seismic performance of the prototype CLT rocking shear walls was investigated using nonlinear time history analyses.Robust nonlinear finite element models were developed using OpenSees and the nonlinear behavior of the displacement-controlled components was calibrated using available experimental data.A detailed site-specific hazard analysis was conducted and sets of ground motions suitable for the prototype buildings were selected.The ground motions were used in a series of incremental dynamic analyses(IDAs)to quantify the adjustable collapse margin ratio(ACMR)of the prototype balloon type CLT rocking shear walls.The results show that the prototype balloon type CLT rocking shear walls designed using the performance-based design procedure outlined in the CCMC/NRC technical guideline have sufficient ACMR when compared to the acceptable limits recommended by FEMA P695.展开更多
基金National Natural Science Foundation of China(NSFC)under Grant Nos.51638012 and 51578401
文摘The seismic performance of a self-centering precast reinforced concrete （RC） frame with shear walls was investigated in this paper. The lateral force resistance was provided by self-centering precast RC shear walls （SPCW）, which utilize a combination ofunbonded prestressed post-tensioned （PT） tendons and mild steel reinforcing bars for flexural resistance across base joints. The structures concentrated deformations at the bottom joints and the unbonded PT tendons provided the self-centering restoring force. A 1/3-scale model of a five-story self-centering RC frame with shear walls was designed and tested on a shake-table under a series of bi-directional earthquake excitations with increasing intensity. The acceleration response, roof displacement, inter-story drifts, residual drifts, shear force ratios, hysteresis curves, and local behaviour of the test specimen were analysed and evaluated. The results demonstrated that seismic performance of the test specimen was satisfactory in the plane of the shear wall; however, the structure sustained inter-story drift levels up to 2.45%. Negligible residual drifts were recorded after all applied earthquake excitations. Based on the shake-table test results, it is feasible to apply and popularize a self-centering precast RC frame with shear walls as a structural system in seismic regions.
基金funding provided by the International Joint Research Laboratory of Earthquake Engineering(ILEE)the Natural Sciences and Engineering Research Council(NSERC).
文摘Balloon type cross laminated timber(CLT)rocking shear walls are a novel seismic force resisting system.In this paper,the seismic performance of four 12-story balloon type CLT rocking shear walls,designed by a structural engineering firm located in Vancouver(Canada)using the performance-based design procedure outlined in the technical guideline published by the Canadian Construction Materials center(CCMC)/National Research Council Canada(NRC),is assessed.The seismic performance of the prototype CLT rocking shear walls was investigated using nonlinear time history analyses.Robust nonlinear finite element models were developed using OpenSees and the nonlinear behavior of the displacement-controlled components was calibrated using available experimental data.A detailed site-specific hazard analysis was conducted and sets of ground motions suitable for the prototype buildings were selected.The ground motions were used in a series of incremental dynamic analyses(IDAs)to quantify the adjustable collapse margin ratio(ACMR)of the prototype balloon type CLT rocking shear walls.The results show that the prototype balloon type CLT rocking shear walls designed using the performance-based design procedure outlined in the CCMC/NRC technical guideline have sufficient ACMR when compared to the acceptable limits recommended by FEMA P695.
