LRB支座选取及其对连续梁桥减隔震效果的影响  

Selection of LRB and its effect on continuous girder bridge seismic isolation

作　　者：陈之健[1] 赵建锋[1] 朱俊[1] 白林坡[1] 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033

出　　处：《地震工程与工程振动》2015年第5期85-91,共7页Earthquake Engineering and Engineering Dynamics

基　　金：山东省优秀中青年科学家科研基金(BS2009SF003)

摘　　要：本文以桥梁上部结构自重等荷载引起的墩台处支座反力为考虑因素,通过选择合适的铅芯橡胶支座并进行了一系列的数值分析,使桥梁结构减隔震效果达到最佳。基于大型有限元软件Midas Civil建立某三跨连续梁桥,采用动力时程分析方法,初选了六组支座作为研究对象,以墩底内力、支座内力、支座滞回耗能特性、墩顶加速度、主梁观测点加速度等为主要考虑因素,对铅芯橡胶支座的减隔震效果进行了分析。结果表明,当选取桥台处LRB支座竖向承载力约为支座反力的1.12倍,桥墩处LRB支座竖向承载力约为支座反力的1.10倍,且所有LRB支座铅芯屈服力约为梁体自重的0.056倍时,减隔震效果最佳。In this paper, considering bearing reaction force induced by bridge superstructure weight and other load, through selecting several group LRB and conducting a series of numerical analysis, the better bridge structure seismic isolation effect is obtained. Based on FE software Midas Civil, a three-span continuous girder bridge numerical model is built. Dynamic time-history analysis is used and six groups cording to internal force of pier bottom, bearing internal force of bearing, bearing are selected as research subjects, ac- hysteretic energy characteristics, acceler- ation of pier top, acceleration of the main beam observation point, lead-rubber bearing isolation effect is analyzed. The results show that when the vertical bearing capacity of LRB at abutment is 1.12 times bearing reaction force, and LRB vertical bearing capacity of piers is 1.10 times bearing reaction force, and all LRB lead yield strength is about 0.056 times the beam weight, all seismic isolation indexes achieve better results.

关 键 词：铅芯橡胶支座 减隔震 桥梁抗震 

分 类 号：TU35[建筑科学—结构工程] U448[建筑科学—桥梁与隧道工程]