基于位移及滞回耗能的结构抗震性能评估新方法  

A New Method for Evaluating Seismic Performance based on Displacement and Hysteretic Energy

作　　者：易伟建[1] 尹犟[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2009年第8期1-6,共6页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50678064)

摘　　要：根据Pushover分析的基本假定,推导了多自由度体系结构与其等效单自由度体系之间位移及能量的近似转换关系;在此基础上,采用Park-Ang模型对结构在地震作用下的整体损伤指标进行合理估计,并据此对结构的抗震性能作出综合评估.本文方法能同时体现地震作用下结构的最大变形及滞回耗能总量对其损伤造成的影响,具有广阔的工程应用前景.为验证该方法的准确性,对一典型的7层混凝土框架结构进行了算例验证.结果表明,算例结构的整体损伤指标估计误差仅为7.0%左右,其中位移项估计误差约为6.6%,能量项估计误差约为9.9%.According to the basic hypothesis employed in pushover analysis procedures, The approximate relationships for converting the hysteretic energy between the MDOF system structure and its equivalent SDOF system is established. Based on it, the Park-Ang model is applied to estimate the overall damage index of struc- tures under seismic action. According to the estimated results, the seismic performances of structures are evaluated synthetically. The method developed can simultaneously consider the effects of the maximum deformation and the hysteretic energy, so it can be widely used in engineering. To examine the accuracy of this method, a 7- story concrete frame was studied as a case. The results have shown that the estimated error of the overall damage index is about 7.0 %, among which the damage index due to the displacement is about 6.6 %, and the damage index due to the energy is about 9.9 %.

关 键 词：地震反应 耗能 Park-Ang模型 

分 类 号：TU311.3[建筑科学—结构工程] TU375.4