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《Earthquake Engineering and Engineering Dynamics》 2018-02
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Effect of ground motion duration on post-earthquake reparability of RC frame considering inelastic deformation of beam-column joint

SUN Xiaoyun;HAN Jianping;Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology;Institute of Earthquake Protection and Disaster Mitigation,Lanzhou University of Technology;  
Reparability evaluation of structures plays a very important role in post-earthquake performance evaluation and decision-making. Residual deformation is one of the usable indices to evaluate the post-earthquake reparability of structures. First,three modelling cases for beam-column joints were taken in order to account for the influence of the possible inelastic deformation of beam-column joint,which are the joint without considering inelastic deformation,with considering the bar bond-slip and with considering the bar bond-slip and the shear deformation together. Then,a 6-storey infilled reinforced concrete(RC) frame was taken and different finite element models ofthe structure corresponding to the different joint modelling cases were built via Open Sees. 30 long-duration and 30 short-duration ground motion records were selected and spectrally matched to the design code target spectrum. Furthermore,Incremental dynamic analyses(IDA) were conducted on the numerical models with different joint models respectively under the 60 ground motion records. The IDA curves for two sets of ground motion records,the correlation between the significant duration of ground motion and residual deformation,the seismic fragility curves for two sets of ground motion records based on residual deformation were obtained to investigate the influence of ground motion duration on post-earthquake reparability of the structure. The analytical results show that the residual deformation increases slightly with the increase of significant duration,and this trend becomes more and more obvious with the inelastic deformation increase of joints. The effect of long-duration ground motion on post-earthquake reparability is more obvious than that of short-duration ground motion records for the frames with the same joint models. And with the same fragility level,the effect of long and short duration records on post-earthquake reparability is more and more obvious with the inelastic deformation increase of joints.
【Fund】: 国家自然科学基金项目(51578273 51268036);; 教育部长江学者和创新团队发展计划(IRT13068)~~
【CateGory Index】: TU352.11;TU375.4
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