层屈服后刚度对地震响应离散性影响的研究  

INFLUENCE OF THE INTER-STORY POST-YIELD STIFFNESS TO THE VARIANCE OF SEISMIC RESPONSE

作　　者：马千里[1] 陆新征[1] 叶列平[1] 

机构地区：[1]清华大学土木工程系

出　　处：《工程力学》2008年第7期133-141,共9页Engineering Mechanics

基　　金：国家十一五科技支撑计划(2006BAK01A02-09);清华大学基础研究基金(JC2007003)

摘　　要：结构的弹塑性地震响应通常具有很大的离散性,使结构在大震下的性态难以把握,给基于性能抗震设计方法的实现带来困难。除了地震波本身的随机性原因外,结构弹塑性地震响应的离散程度还与结构自身的抗震性能有很大关系。该文基于大量弹塑性地震响应数值分析,研究了结构屈服后刚度对结构弹塑性地震响应离散性的影响。研究表明:结构屈服后刚度退化越小,因结构自身原因导致的弹塑性地震响应离散性也越小。基于该研究结果,该文指出具有主-次结构体系的抗震结构,可有效控制结构的抗震性能,有利于实现基于性能抗震设计。The remarkable variation of seismic responses of structures under strong earthquakes limits me implementation of performance based seismic design. Response variation may be caused by characteristics of ground motions and the seismic behaviors of structures. Based on numerical simulations, the influence of structural post-yielding stiffness on the seismic responses of multi-degree of freedom （MDOF） structural systems is discussed. By preventing stiffness degradation beyond elastic range, damage concentration in structures may be avoided, which would also reduce the variation of inelastic seismic responses. Moreover, it is found that structures with higher post-yielding stiffness are more effective to control the seismic performance of structures.

关 键 词：地震响应 弹塑性 屈服后刚度 离散性 基于性能抗震设计 

分 类 号：TU311.3[建筑科学—结构工程]