两种减隔震支座动力参数的设计方法及减隔震效果差异研究  

Research on dynamic parameter design method of two kinds of base isolation bearing and their effect difference

作　　者：阮怀圣[1] 何友娣[1] 

机构地区：[1]中铁大桥勘测设计院集团有限公司,湖北武汉430056

出　　处：《世界地震工程》2017年第1期223-229,共7页World Earthquake Engineering

摘　　要：为探讨强震区梁式桥减隔震支座的合理设计问题,根据设计经验归纳总结了铅芯橡胶和摩擦摆两种减隔震支座动力参数的一般设计方法及流程;针对实桥给出了两种支座的详细动力设计参数,并对参数进行了敏感性分析;根据时程分析结果对减隔震效果差异进行了对比,运用等效线性化理论解释了差异的内在原因。研究结果表明:支座摩擦系数并不是越大越有利,而应通过分析确定;由于铅芯橡胶与摩擦摆支座等效刚度值的明显不同,导致随着地震作用的提高结构内力响应差别将逐渐减小,而梁端位移响应差别呈显著增大趋势;建议高烈度区桥梁减隔震支座选型宜选用铅芯橡胶支座。To discuss the rational design problems of seismic isolation bearing of girder bridges in meizoseismal areas, this paper summarizes the general design methods and processes of dynamic parameters about the lead plug-rubber and friction pendulum isolation bearing based on design experience, carries out parameter sensitivity analysis after giving details of two dynamic design parameters, compares the isolation effect difference according to the results of time-history analysis, and explains the intrinsic cause of differences by equivalent linear theory. The result indicates that friction coefficient is not the larger the better and it should be determined by analysis. Because of different equivalent stiffness values of lead plug-rubber bearings and friction pendulum, as the seismic action strengthens, the differences of structural earthquake internal force response will gradually reduce, but the differences of displacement response at beam ends will significantly increase. It recommends that type selection of bearing should use lead plug rubber bearings in meizoseismal areas.

关 键 词：减隔震支座 铅芯橡胶支座 摩擦摆支座 动力参数 设计方法 减隔震效果 差异 

分 类 号：TU378[建筑科学—结构工程]