Seismic Performance Analysis And Evaluation Of Reinforced Concrete Frame Structures Under Earthquake Considering Residual Displacement

A survey of previous earthquakes shows that after experiencing earthquake excitation,even if the structure is not severely damaged or collapsed,but the damaged structure may need to be dismantled due to excessive permanent deformation（residual deformation）at the end of the earthquake.Therefore,it is necessary to consider the introduction of the residual deformation index for structural damage evaluation and performance evaluation,and then use it as an effective complement to the commonly used evaluation index（such as the maximum deformation index）.The specific research work in this paper is as follows:（1）Firstly,starting with the method of finite element analysis software modeling,and analysis and comparison the hysteretic model（bilinear hysteresis model and modified Takeda hysteresis model）,the cross-section model and the element model（Displacement-Based BeamClolumn element and Force-Based BeamClolumn element）.The reliability of finite element software model simulation is evaluated based on their accuracy in predicting the maximum and residual displacement.The sensitivity of maximum and residual displacement predicted by idealized model is evaluated.The existing research results are summarized,and a set of modeling method for RC structural dynamic analysis is proposed,which provides a reliable theoretical basis for the numerical simulation of the following.（2）Secondly,based on the records of 18 groups of earthquakes in 2008 Wenchuan Earthquake,the time history analysis of bilinear single-degree-of-freedom system with damping ratio of 5%and different fundamental period and different ductility coefficients.The maximum displacement and the residual displacement response of the structure are extracted,and the correlation between the maximum displacement and the residual displacement is studied.The influence of the ductility coefficient on the correlation between the maximum displacement and the residual displacement response is analyzed under the same cycle.And the influence of the cycle on the correlation between the maximum displacement and the residual displacement response were discussed.（3）Thirdly,starting from considering the influence of different ground motions on the residual displacement response of structures,this paper studies the structure’s incremental dynamic analysis（IDA）through different ground motion intensity measures S_a（T₁,5%）and S_d（T₁,5%）.The maximum inter-story drift and the maximum residual inter-story drift under different ground motion intensity measures（PGA and PGV）were extracted to study the size and distribution of the structure.Then the correlation between the response of maximum inter-story drift and the maximum residual inter-story drift are discussed.（4）Fourthly,the RC planar frame structure model with different storey numbers is established.Firstly,the sturctures analyed by static pushover analysis,and the first-mode pushover curves and the corresponding equivalent trilinear pushover curves of the structure were obtained.And then the post-yielding stiffness ratios and post-capping stiffness ratios of the structures based on the equicalent pushover curves were calculated.Secondly,the mean,standard deviation and variation coefficient values of the maximum inter-story drift ratios and the maximum residual inter-story drift ratios were calculated by elastic-plastic time history analysis of the structures under 22 ground motion records.The influence of the fundamental period,the post-yielding stiffness ratio and the post-capping stiffness ratio of the structures on the maximum inter-story drift ratios and maximum residual inter-story drift.