大跨连续梁桥桩基础的减隔震分析  

Aseismic Isolation for Pile Foundation of Long-span Continuous Girder Bridge

作　　者：郭红梅[1,2] 周燕[1,2] 张凯[3] 李宇[4] 

机构地区：[1]天津城建大学土木工程学院,天津300384 [2]天津市软土特性与工程环境重点实验室,天津300384 [3]天津市赛英工程建设咨询管理有限公司,天津300191 [4]长安大学公路学院,陕西西安710064

出　　处：《郑州大学学报（工学版）》2015年第1期70-74,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(51408042);天津市市政公路行业科技创新计划项目(2013-04);2012年天津市"131"创新型人才培养工程第三层次资助计划;2013年天津市高校"优秀青年教师资助计划"

摘　　要：以中宁和中卫黄河公路大桥为背景,采用铅芯橡胶支座代替普通支座,建立了隔震和非隔震连续梁桥有限元模型.并通过选取合理强震记录作为地震输入,研究了铅芯橡胶支座对大跨连续梁桥桩基础地震响应的影响,从中可知:(1)铅芯橡胶支座可使桩基顶部的弯矩和剪力明显减少,进而保证地震作用下桩基的安全;(2)铅芯橡胶支座使剪力和弯矩在不同桥墩间的分配趋于均匀,在使用相同桩基的情况下,减少了强度的浪费.可见,铅芯橡胶支座可改善桩基受力,并可优化桩基设计.By using FEA software,analysis models of seismically isolated and non-isolated continuous bridges are established for Zhongning and Zhongwei Yellow River highway bridge. And the effect of LRB for seismic response of this bridge is analysised by consideering force,energy and displacement under the function of the reasonably chosen seismic motion. The results indicate that the natual period of seismically isolated bridge can be prolonged to avoid the principal period of ground. Meanwhile,the seismic energy of structure can be efficiently consumed by the hysteretic energy dissipation of lead rubber bearing. So the response of bridge structure can be reduced. The decrease of the structural force and moment is benefic for seismic design by using LRB.

关 键 词：梁式桥 铅芯橡胶支座 减隔震设计 弹塑性位移 非线性分析 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]