基于结构整体损伤指标的钢框架地震易损性研究

PDF(1528 KB)

振动与冲击 ›› 2014, Vol. 33 ›› Issue (11) : 78-82.

论文

基于结构整体损伤指标的钢框架地震易损性研究

徐强，郑山锁，韩言召，程洋，田进

作者信息 +

Research of steel frame earthquake vulnerability based on a global structural damage index

XU Qiang, ZHENG Shan-suo, HAN Yan-zhao, CHEN Yang, TIAN Jin

Author information +

文章历史 +

摘要

以9层梁柱焊接钢框架为例，选取20条满足场地条件的地震波，对结构进行动力增量时程分析(IDA)，对比分别以层间位移角和能量耗散作为结构整体损伤指标评判的结构损伤程度，发现仅以层间位移角作为结构整体损伤指标会高估结构抗倒塌能力，而仅以能量耗散作为结构整体损伤指标则无法判别结构失效模式。为避免单一结构整体损伤指标的缺点，能够同时考虑整体结构的首超破坏与累积损伤，提出了一个基于层间位移角和能量耗散的双参数线性组合的结构整体损伤模型，定义结构4种极限破坏状态，对比层间位移角、能量耗散与建立的结构整体损伤模型的结构损伤曲线与易损性曲线。结果显示，基于层间位移角和能量耗散的双参数线性组合的结构整体损伤模型能够更加合理的描述结构的损伤程度。

Abstract

By selecting 20 seismic waves that were used for incremental dynamic analysis, the damage degree of a 9 stories beam-column welded steel frame was compared in terms of inter-story drift angle and energy dissipation respectively as the global structural damage index. The results show that it would overestimate the structural collapse resistance capacity when considering inter-story drift angle as the global structural damage index, and the failure modes of structure would not be distinguished when considering energy dissipation only. To consider the first excursion damage failure and cumulative damage of the structure, an global damage model of structure based on the linear combination of two parameters including both inter-story drift and energy dissipation was proposed to avoid the disadvantage of single index. The global structure’s damage curve and fragility curve was compared when inter-story drift angle , energy dissipation,as well as proposed damage model was taken as global structural damage index by defining four limit states of damage and results indicate that the proposed method would more reasonable evaluate the damage of a steel structure under strong earthquakes.

导出引用

徐强;郑山锁;韩言召;程洋;田进. 基于结构整体损伤指标的钢框架地震易损性研究[J]. 振动与冲击, 2014, 33(11): 78-82

XU Qiang;ZHENG Shan-suo;HAN Yan-zhao;CHEN Yang;TIAN Jin. Research of steel frame earthquake vulnerability based on a global structural damage index[J]. Journal of Vibration and Shock, 2014, 33(11): 78-82