等截面多跨连续梁桥LRB减隔震效果分析  

Seismic Isolation Effect Analysis of Equal Section Multi-span Continuous Beam Bridge with LRB

作　　者：宁夏元[1] 栗小祜 

机构地区：[1]湖南省交通科学研究院,湖南长沙410015 [2]湖南省通平高速公路建设开发有限公司,湖南岳阳414500

出　　处：《公路工程》2012年第6期69-74,80,共7页Highway Engineering

摘　　要：论文以湖南省通平高速公路张家坡5×30 m等截面多跨连续梁桥为工程背景,采用双向耦合铅芯橡胶支座(LRB)模型,以MIDAS有限元软件中带有刚度和阻尼的非线性弹簧模拟,建立了其右幅桥铅芯橡胶支座(LRB)减隔震与左幅桥未减隔震模型,进行了在E2地震作用下的桥梁动力响应时程分析,通过对左右两幅桥在地震作用下时程响应结果的对比,对等截面多跨连续梁桥LRB减隔震效果进行了分析,并得到了一些重要结论,为高速公路等截面多跨连续梁桥的LRB减隔振设计工作提供参考。In this study,on the background of Zhangjiapo bridge,a 5×30 m equal section multi-span continuous beam bridge of Tongping highway in Hunan province,by use of two-way-coupling model of lead rubber bearing（LRB） simulated by the nonlinear spring element both with rigidity and damp in MIDAS finite element software,two analysis models of the right panel bridge with LRB and the left panel bridge without LRB are founded respectively.Utilizing nonlinear dynamic time course analysis,based on the comparative study of the seismic responses corresponding to the right panel bridge and the left panel bridge obtained under E2 earthquake,the seismic isolation effect of equal section multi-span continuous beam bridge with LRB was explored.Some important conclusions were drawn and the present work could provide some reference for similar seismic isolation design of highway equal section multi-span continuous bridge.

关 键 词：等截面多跨连续梁桥 减隔振 铅芯橡胶支座 非线性动力时程分析 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]