考虑残余变形的RC框架结构抗震性能评估  

Seismic performance evaluation of RC frame structures considering residual deformation

作　　者：魏世龙 韩建平[1,2] 黄林杰 Wei Shilong;Han Jianping;Huang Linjie(Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,China;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China;Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050 [3]南京林业大学,江苏南京210037

出　　处：《土木工程学报》2023年第1期66-76,共11页China Civil Engineering Journal

基　　金：国家自然科学基金项目(51578273,51268036);教育部长江学者和创新团队发展计划(IRT_17R51)。

摘　　要：震后残余变形对于工程结构震后损伤和可修复性能的评价至关重要。首先,选取790条地震动记录对一个5层钢筋混凝土(RC)框架结构进行增量动力分析,线性回归得出结构各损伤状态(性能水平)与残余层间位移角的量化关系;然后,分别对一个8层和一个11层RC框架结构进行增量动力分析,研究结构最大层间位移角和残余层间位移角两种损伤指标间的相关性;最后,对8层和11层结构分别进行基于两种损伤指标的地震易损性分析。分析结果表明:残余层间位移角与最大层间位移角具有较好的相关性;以最大层间位移角为结构损伤指标所得残余层间位移角无明显差异性,同样以残余层间位移角为结构损伤指标所得最大层间位移角也无明显差异性;以最大层间位移角和残余层间位移角为损伤控制指标,各损伤状态下50%超越概率对应的谱加速度Sa(T1,5%)无明显偏差;以规范给出的最大层间位移角为损伤控制指标相对文章提出的残余层间位移角较为保守。因此,将残余层间位移角作为性能指标的研究对于基于层间位移角的震后结构性能评估是必要的。Post-earthquake residual deformation plays an important role in the evaluation of damage state and repairability performance for engineering structures after earthquakes.Firstly, the incremental dynamic analysis(IDA) was conducted on a 5-storey reinforced concrete(RC) frame structure under 790 ground motion records.The quantitative relationship between the structural damage state(or performance level) and the residual inter-storey drift ratios(RIDR) were obtained via linear regression analyses.Secondly, IDA was conducted on a 8-storey and a 11-storey RC frame structure to investigate the correlation between the two damage indexes, namely the maximum inter-storey drift ratios(IDRmax) and RIDR.Finally, seismic fragility analyses corresponding to different damage states were conducted based on the two damage indexes.The analytical results indicate that there is a good correlation between RIDR and IDRmax.With IDRmaxtaken as the damage index of the structure, the obtained RIDR may differ insignificantly, and with RIDR taken as the damage index of the structure, the obtained IDRmaxmay also differ insignificantly, and with both IDRmaxand RIDR taken as the damage index, Sa(T1,5%) corresponding to the 50% exceedance probability for each damage state may differ insignificantly.The damage control index of IDRmaxspecified in the seismic design code was more conservative than that of RIDR proposed in this study.Therefore, it is necessary to carry out the research of applying RIDR to assessing seismic performance of structures based on IDRmax.

关 键 词：残余层间位移角 地震易损性分析 增量动力分析 损伤指标 性能水平 

分 类 号：TU352.1[建筑科学—结构工程]