考虑柱脚转动刚度的多层钢框架易损性分析  

Seismic Fragility Analysis of Multi-story Steel Frames Considering Rotational Stiffness of Column Base

作　　者：崔瑶[1] 刘浩[1] 王枫智 山田哲 CUI Yao;LIU Hao;WANG Fengzhi;YAMADA Satoshi(State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;Institute of Innovative Research, Tokyo Institute of Technology, Tokyo 2268503,Japan)

机构地区：[1]大连理工大学海岸及近海工程国家重点实验室,辽宁大连116024 [2]东京工业大学科学技术创成研究院,日本东京2268503

出　　处：《建筑钢结构进展》2019年第3期33-39,共7页Progress in Steel Building Structures

基　　金：国家自然科学基金(51208076、51678106);中央高校基本科研业务费专项资金项目(DUT14LK04)

摘　　要：通过对多层钢框架进行增量动力分析,研究柱脚转动刚度、底层破坏模式以及钢柱宽厚比对多层钢框架抗震性能的影响,具体从结构倒塌储备系数、地震易损性以及结构局部响应考察各影响因素对结构抗震性能的影响。分析结果表明,当破坏模式由钢柱破坏控制时,随着钢柱宽厚比的增大结构抗震性能减弱,考虑柱脚刚度的半刚接柱脚钢框架地震易损性与刚接柱脚钢框架差别较小,当柱脚与柱刚度比为2.0时,框架地震易损性与刚接柱脚钢框架非常接近;当破坏模式由柱脚破坏控制时,可以明显降低钢柱宽厚比的要求。Based on the incremental dynamic analysis (IDA) of a multi-story steel frame,the effect of column base rotation stiffness,bottom failure mode and steel column section width-to-thickness ratio on the seismic behavior of multi-story steel frame is studied,and the influencing factors on the seismic performance of structure are investigated from the collapse margin ratio (CMR) of structure,seismic vulnerability and structural local response.The results show when the failure is caused by steel column,the seismic performance is decreasing with the increase of steel column section width-to-thickness ratio,the difference between seismic fragility of semi-rigid steel frame considering the stiffness of column base and that of the rigid steel frame is small,and the seismic fragility of semi-rigid steel frame is close to that of the rigid steel frame when the ratio of column base and column stiffness is 2.0.When the failure is caused by column base,the requirement of the steel column section width-to-thickness ratio can be reduced significantly.

关 键 词：柱脚 钢框架 倒塌储备系数 易损性分析 抗震性能 

分 类 号：TU352.1[建筑科学—结构工程]