LRB隔震储罐地震反应的双向耦合效应  

Bi-directional coupling effect of seismic response of LRB base-isolated storage tank

作　　者：李扬[1] 李自力[1] 王鸿膺[1] 邵大伟[2] 

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,山东青岛266555 [2]中国石化管道储运分公司新乡输油处,河南新乡453003

出　　处：《世界地震工程》2014年第2期229-236,共8页World Earthquake Engineering

基　　金：中央高校基本科研业务费专项资金资助(11CX04046A)

摘　　要：建立了双向地震作用下LRB基础隔震储罐地震反应的数值模型,对单向和双向地震作用下隔震储罐的地震反应和隔震支座的力学性能进行了对比研究。提出了衡量双向耦合效应影响的评价指标,分析了不同类型场地上隔震储罐地震反应的双向耦合效应影响规律。研究表明,双向耦合效应使支座滞回曲线变得不规则,呈现出粘滞特性。双向耦合效应不会引起隔震储罐基底剪力、弯矩、晃动波高的明显增大,但忽视双向耦合效应会严重低估支座位移,尤其是在II类和IV类场地上更为明显。因此在LRB隔震储罐双向地震反应分析时,不能简单选取两个单向地震作用下响应的组合值作为地震响应值,必须考虑双向耦合效应的影响。The analytical model for seismic response of lead rubber bearing（LRB） base-isolated tank under bi-di-rection excitations was established. The seismic response of the LRB based-isolated storage tank and the dynamiccharacteristic of LRB were investigated. The effect of bi-directional couple interaction on seismic responses of LRBbase-isolated tank at different sites was evaluated by new proposed assessment indices. It is observed that force-dis-placement relationship of LRB becomes irregular and behaves as viscosity under bi-direction excitations. The bi-directional coupling effect does not increase base shear and sloshing height obviously except the bearing displace-ment, and ignoring the coupling the effect results in underestimating the bearing displacement seriously, especiallyat Site II and site III. Thus, the coupling effect on seismic response of LRB base-isolated tank must be consideredfrom the view point of design.

关 键 词：隔震储罐 铅芯橡胶支座 双向耦合效应 地震响应 

分 类 号：TU352[建筑科学—结构工程]