基于IDA方法的高层剪力墙结构地震易损性研究

Study on Seismic Vulnerability of High-rise Shear Wall Structure Based on IDA Method

以一既有高层剪力墙建筑结构为例,通过删减一部分剪力墙作为变量来模拟私拆剪力墙的现象,通过数据对比来判别拆除剪力墙对结构整体抗震性能的影响。在增量动力分析基础上,结合易损性研究,通过调整地震波PGA,分别对四个结构模型进行IDA分析,得到不同强度下的最大层间位移角,划分结构抗震性能水平以及破坏等级,确定各性能水平下的超越概率模型。研究表明:拆除部分剪力墙影响结构的整体抗震性能,提高了结构超越极限状态的概率。其中拆除10层位置剪力墙的结构抗震性能最差,拆除1层位置剪力墙的结构的抗震性能与拆除19层位置剪力墙的结构的抗震性能相当,基准结构的抗震性能最优。

In this paper,taking an existing high-rise shear wall building structure as an example,the phenomenon of private shear wall demolition is simulated by cutting part of the shear wall as variables,and the impact of dismantling the shear wall on the overall seismic performance of the structure is judged through data comparison.On the basis of incremental dynamic analysis and combined with the vulnerability study,by adjusting the seismic wave PGA,the maximum inter-layer displacement Angle under different intensity was obtained,and the seismic performance level and damage level of the structure were divided to determine the surpassing probability model at each performance level.The study shows that the removal of part of the shear wall affects the overall seismic performance of the structure,and improves the probability of the structure exceeding the limit state.Among them,the seismic performance of the shear wall on the 10 floors is the worst.The seismic performance of the shear wall on the 1 floor is comparable to that of the shear wall on the 19 floors,and the seismic performance of the base structure is optimal.