SDOF体系残余变形响应与地震强度指标相关性分析  

Correlation analysis between residual deformation of SDOF system and ground motion intensity indices

作　　者：郝建兵[1] 吴刚[1] 吴智深[1] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096

出　　处：《土木工程学报》2013年第6期1-7,共7页China Civil Engineering Journal

基　　金：国家973计划(CB026205);国家自然科学基金(51178099);中日地震减灾及其应对技术合作研究(2012DFG20510);江苏省高校优势学科建设工程(PAPD)和江苏省普通高校研究生科研创新计划(CXLX_0128)

摘　　要：结构震后可修复性在现代抗震设计中扮演越来越重要的角色,残余变形作为可修复性的一个主要指标受到广泛的重视。弹塑性时程分析法是研究结构震后残余变形的主要方法,传统通过调整输入波PGA指标得到的计算结果离散性很大,因此需要选择一个合适的地震动强度指标控制输入波的选择。计算60条地震动作用下不同强度折减系数和屈服后刚度系数的双线性SDOF体系残余变形,研究以PGA,PGV,PGD为代表的18个地震动强度指标与残余变形之间的相关系数随SDOF体系周期变化规律。结果表明,不同强度指标与残余变形之间的相关系数受强度折减系数影响很大,基本不受屈服后刚度系数的影响,其中以PGV为代表的速度型强度指标与残余变形之间的整体相关性较好,并且考虑到PGV指标的工程特性,建议进行残余变形计算时,以PGV作为输入波主要控制指标。The post-earthquake repairability of structure plays a very important role in modern seismic design. As a major index representing structures＇ post-earthquake repairability, the residual deformation is attracting the world-wide attentions. The time history analysis is a main approach of studying the residual deformation, the traditional seismic input selection method which uses PGA as a control index, however, may cause large dispersion. Hence, it is essential to choose a more appropriate ground motion intensity index to control the input of earthquake accelerations. This study analyzes the correlation coefficients between 18 motion intensity indices and residual deformation as well as their periodic variation rule with SDOF system by means of 60 earthquake accelerations. The results show that the correlation differs greatly and some indices like PGV lead to the best correlation. Consequently, PGV is recommended as a main index to control the earthquake acceleration selection in view of both its good correlation and engineering characteristics.

关 键 词：结构震后残余变形 SDOF体系 地震动强度指标 相关系数 

分 类 号：TU352.1[建筑科学—结构工程]