近场橡胶支座隔震设计探讨  

Discuss of Rubber Bearing Isolation Design on Near-fault Ground Motions

作　　者：韩淼[1] 绳雯[1] 温增平[2] 

机构地区：[1]北京建筑工程学院土木与交通工程学院,北京100044 [2]中国地震局地球物理研究所,北京100081

出　　处：《工程抗震与加固改造》2013年第4期104-108,123,共6页Earthquake Resistant Engineering and Retrofitting

基　　金：北京市教育委员会科技计划重点项目;北京市自然科学基金重点项目(KZ201110016020)

摘　　要：近断层地震动具有不同于远场地震动的动力特征。按建筑抗震设计规范设计了非隔震与橡胶支座隔震钢筋混凝土框架结构,选取近断层与远场地震动记录进行分析。近断层地震动作用下,隔震后结构的最大层间剪力与最大层间位移均减小为非隔震结构的0.3倍左右,隔震对近断层地震动响应具有良好的减震效果;与远场地震动作用相比,近断层地震动作用下的上部结构最大层间位移角增大3～5倍,隔震层最大位移增大15倍,须对隔震层采取防止侧移失稳措施。现行规范以近场影响系数考虑近场橡胶支座隔震设计,尚需随近断层地震动研究新成果进一步完善。There are different characters between near-fault and far-field ground motions.A RC frame structure and a base-isolating RC frame structure are designed according to the Code for Seismic Design of Buildings.Responses of up-structure and isolating layer to near-fault and far-field ground motions are computed.The maximums of layer shear forces and layer displacements of the isolating structure decrease to 0.3 times that of the maximum of the no-isolating structure.The maximum of up-structure layer displacement ratio under near-fault ground motions increases to 3~5 times that of the maximum of far-fault ground motions.The maximum isolating layer displacement under near-fault ground motion increases to 15 times that of the maximum of far-fault ground motions.The isolation has a positive effect to near-fault ground motions,but the safety of isolating layer must be ensured.The rule of rubber bearing isolation design using influence coefficient considering near-fault ground motion in the Code for Seismic Design of Buildings needs to be improved.

关 键 词：近断层地震 隔震 剪力 位移 

分 类 号：TU352.12[建筑科学—结构工程]