基于增量动力分析震后RC柱抗震性能

Seismic Performance of RC Column after Earthquake Based on Incremental Dynamic Analysis Method

为研究震后钢筋混凝土(RC)柱的抗震性能,基于增量动力分析法(IDA),利用OpenSEES平台提出了模拟震后RC柱抗震性能的方法:对经历地震后的RC柱进行低周往复荷载模拟试验。考虑到地震的不确定性,选取ATC-63报告上推荐的22条远场地震动记录,分析了震后RC柱的抗震性能,重点研究了震后RC柱的强度、刚度和延性等力学性能,探讨了震后RC柱强度退化模型的方法,分析了轴压比因素对震后RC柱抗震性能的影响。结果表明:震后RC柱的强度和刚度随地震动强度指标(PGA)的增大而下降,随轴压比的增大而增大;震后RC柱的延性随轴压比的增大而下降,随PGA的增大而先下降后提高。

In order to study the seismic performance of post-earthquake reinforced concrete(RC)columns,based on incremental dynamic analysis(IDA)and using OpenSEES platform,a method for simulating the seismic performance of post-earthquake RC columns was proposed,and a low-cycle load simulation experiment was conducted on RC columns after earthquake.Considering the uncertainty of ground motion,22 records of far-field seismic records recommended in the ATC-63 report of the United States were selected.The seismic performance of post-earthquake RC columns was analyzed.The mechanical properties of post-earthquake RC columns such as strength,stiffness and ductility were emphatically studied.Furthermore,the method of establishing the strength degradation model of post-earthquake RC column was discussed,and the influence of different axial compression ratio on seismic performance of post-earthquake RC column was compared.The results show that the strength and stiffness of post-earthquake RC columns decrease with the increase of ground vibration intensity(PGA)and increase with the increase of axial compression ratio.The ductility of post-earthquake RC columns decreases with the increase of axial compression ratio and decreases first and then increases with the increase of PGA.