近断层地震下隔震系统的损伤控制研究  

Damage control of seismic-isolated structure systems under near-fault earthquakes

作　　者：谢云飞[1,2] 刘阳[3,4] 何文福[2] XIE Yunfei;LIU Yang;HE Wenfu(Nantong Shipping College,Nantong 226010,China;College of Civil Engineering,Tongji University, Shanghai 200092,China;Shanghai Baoye Group Co.,Ltd.,Shanghai 200941,China;Department of Civil Engineering,Shanghai University,Shanghai 200072,China)

机构地区：[1]南通航运职业技术学院,江苏南通226010 [2]上海大学土木工程系,上海200072 [3]同济大学土木工程学院,上海200092 [4]上海宝冶集团有限公司,上海200941

出　　处：《振动与冲击》2018年第19期183-189,216,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51508414,51308331);南通航院科技课题(HYKY/2017KJB05)

摘　　要：近断层地震作用下易造成隔震结构隔震层产生较大位移,当位移过大会造成结构与挡土墙发生碰撞从而引起结构损伤。为研究近断层地震下隔震结构的损伤性能及损伤控制机理,建立了考虑结构损伤的隔震结构分析模型。采用弹塑性时程反应分析方法比较了近断层地震下隔震结构在附加黏滞阻尼比、变频隔震及附加缓冲限位装置情况下的结构损伤控制效果。研究结果表明当近断层地震下隔震层位移超过隔震缝间距且数值越大,隔震结构损伤越严重;采用三种方法进行近断层地震下的损伤控制时设计地震动下结构损伤轻微,采用附加黏滞阻尼比的方法对近断层地震下的损伤控制最有效,采用变频隔震系统对近断层地震下的隔震层位移控制效果最佳。研究结果可为隔震结构在近断层地震下的损伤控制提供参考。Near-fault earthquakes tend to cause isolation layer’s larger displacement of seismic-isolated structures.Larger displacement leads to impacts between seismic-isolated structures and earth-retaining walls.To study damage performance and damage control mechanism,the analysis model for a seismic-isolated structure considering structure damage was established.Damage control effects of the seismic-isolated structure with added viscous damping ratios,variable frequency isolators and added buffer limit devices were compared using the elastic-plastic time history analysis method.The study results showed that when displacement of isolation layer of the seismic-isolated structure under near-fault ground motions is beyond the isolation joint spacing,the larger the displacement value,the more serious the damage of the structure;when using the three methods above mentioned to control damage under near-fault earthquake,the seismic-isolated structure’s damage under the designed ground motion is slight,using added viscous damping ratio is the most effective approach to control structure damage under nearly-fault earthquake,using variable frequency vibration isolation system has the best effect.The results provided a reference for damage control of seismic-isolated structures under near-fault earthquakes.

关 键 词：隔震结构 损伤控制 近断层地震 碰撞 

分 类 号：TU311.3[建筑科学—结构工程]