考虑退化效应的非弹性体系震后概率残余位移分析  

Probabilistic Residual Displacement Analysis of Inelastic System with Degradations

作　　者：余波[1] 刘迪[1] 杨绿峰[1,2] 

机构地区：[1]广西大学土木建筑工程学院,工程防灾与结构安全教育部重点实验室,广西南宁530004 [2]广西壮族自治区住房和城乡建设厅,广西南宁530028

出　　处：《工程抗震与加固改造》2014年第2期72-80,共9页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金项目(51168003);人社部留学人员择优资助项目([2012]-258号);广西自然科学基金重大项目(2012GXNSFEA053002);广西自然科学青年基金项目(2013GXNSFBA019237);广西高校科学技术研究项目(2013YB009)

摘　　要：震后残余位移是评价工程结构震后可修复性和可用性的重要指标,而刚度和强度退化对震后残余位移的影响显著。本文采用综合考虑刚度和强度退化效应的非弹性地震动力响应分析的Bouc-Wen模型,结合从NGA强震数据库中所筛选的69条强震记录,定量地分析了刚度和强度退化效应对非弹性体系震后概率残余位移的影响,进而以自振周期、屈服后刚度比以及刚度和强度退化参数作为控制参数,建立了考虑退化效应的非弹性体系震后残余位移的预测模型。分析表明,刚度退化导致非弹性体系的位移时程曲线向平衡点位置方向偏移,从而引起残余位移减小;强度退化使非弹性体系的位移时程曲线向远离平衡点位置方向偏移,从而导致残余位移增大;增大结构的屈服后刚度比可以有效减小非弹性体系的残余位移。Residual displacement which influenced by both stiffness and strength degradations plays an important role in evaluation of repairability and usability for engineering structures after strong earthquake.The Bouc-Wen model involving both stiffness and strength degradations for inelastic dynamic analysis is adopted to investigate the influences of the stiffness deterioration and strength degradation on the probabilistic residual displacement based on the 69 strong ground motion records selected from the NGA earthquake database.The prediction equation of residual displacement is developed in terms of the natural vibration period,post-yield stiffness ratio as well as stiffness and strength degradation parameters.Analysis results show that the stiffness degradation makes the time-history of displacement approach to the the position of equilibrium and decreases the residual displacement,while the strength degradation induces an obvious excursion far away from the position of equilibrium and increases residual displacement ; moreover,increase of post yield stiffness ratio may decrease the residual displacement efficiently.

关 键 词：残余位移 刚度退化 强度退化 屈服后刚度比 BOUC-WEN模型 

分 类 号：TU311.3[建筑科学—结构工程]