摘要
结构经历地震后的残余位移可作为结构震后可修复能力的重要指标,研究结构的残余位移对于地震灾区震损结构性能的评价具有重要意义。本文以双线型单自由度体系为计算模型,选取了中国规范对应的4种场地120条地震动,通过弹塑性动力时程分析,分析了场地条件、屈服后刚度比、强度折减系数和周期等参数对残余位移的影响。分析结果表明,场地条件、屈服后刚度比和周期是影响残余位移的主要因素,强度折减系数对残余位移的影响不大。相关性分析表明,结构的残余位移与最大位移、滞回耗能之间存在较好的线性关系。以Park-Ang损伤模型为基础,提出了震后单自由度体系基于残余位移的损伤评价方法。
Residual displacement is an important index for the repairable ability of structures after earthquake striking, so it is of great significance to analyze the residual displacement for evaluating the structural performance after earthquakes. In this paper, 120 ground motions from four kinds of sites have been selected for the bilinear single degree of freedom （SDOF） system. Through the elastic-plastic dynamic time history analysis, the parameters such as site condition, post-yield stiffness ratio, strength reduction coefficient and period are analyzed to find out their effects on residual displacement. The results show that site condition, post-yield stiffness ratio and period are the main factors affecting residual displacement, but the strength reduction coefficient has little effect on residual displacement. The correlation analysis shows that there is a good linear relationship among the residual displacement, the maximum displacement and the hysteretic energy. On the basis of Park-Ang damage model, a damage evalua- tion method based on residual displacement is proposed for SDOF system.
出处
《地震工程与工程振动》
CSCD
北大核心
2017年第5期109-117,共9页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(51408211)
长沙理工大学桥梁结构安全控制湖南省工程实验室开放基金项目(14KD02)
湖南省自然科学基金项目(2015JJ3032)
国家留学基金委资助项目(201606135057)~~
关键词
残余位移
单自由度体系
最大位移
滞回耗能
损伤评价
residual displacement
SDOF
maximum displacement
hysteretic energy
damage assessment
