基于结构整体损伤指标的钢框架地震易损性研究  

Steel frame seismic vulnerability based on a global structural damage index

作　　者：徐强[1] 郑山锁[1] 韩言召 程洋[1] 田进[1] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《振动与冲击》2014年第11期78-82,106,共6页Journal of Vibration and Shock

基　　金：国家科技支撑计划(2013BAJ08B03);长江学者和创新团队发展计划;国家自然科学基金(50978218;51108376);高等学校博士学科点专项科研基金(20106120110003);陕西省科研项目(2012K12-03-01;2010JK633;2011KTCQ03-05)

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。By selecting 20 seismic waves used for incremental dynamic analysis,the damage levels of a 9-story beam-column welded steel frame were compared taking inter-story drift angle and energy dissipation,respectively as the global structural damage index.The results showed that the structural collapse-resistance capacity is overestimated only taking inter-story drift angle as the global structural damage index,and the failure modes of the structure can not be distinguished only taking energy dissipation as the global structural damage index.To consider the first excursion damage failure and cumulative damage of the structure,a structural global damage model based on the linear combination of two parameters including both inter-story drift angle and energy dissipation was proposed to avoid the disadvantages of a single index.The global structural damage curves and fragility curves were compared with inter-story drifi angle,energy dissipation and the proposed damage model taken as the global structural damage index by defining four ultimate states of damage.The results indicated that the proposed model is more reasonable to evaluate the damage level of a steel structure under strong earthquakes.

关 键 词：钢框架 损伤模型 易损性分析 层间位移角 能量耗散 

分 类 号：TU528.01[建筑科学—建筑技术科学]