连续梁桥缆索限位器设计方法  

Study on restrainer design method for continuous bridges

作　　者：张华[1,2] 李建中[1] 彭天波[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]内华达大学土木与环境工程学院,里诺89557

出　　处：《东南大学学报（自然科学版）》2013年第1期209-215,共7页Journal of Southeast University：Natural Science Edition

基　　金："十一五"国家科技支撑计划资助项目(2009BAG15B01);国家自然科学基金资助项目(51278372);交通部西部交通建设科技资助项目(200731882233)

摘　　要：首先提出了梁桥有效搭接长度的确定方法.在参考国外缆索限位器设计方法的基础上,针对采用板式橡胶支座的连续梁桥,根据不同伸缩缝位置的约束特点,提出了对应的简化力学分析模型.简化模型考虑了板式橡胶支座滑动、缆索限位器和伸缩缝约束作用的非线性特性,在此基础上提出了不同伸缩缝位置处相应的缆索限位器设计方法.采用该方法对某桥进行了缆索限位器设计,并用非线性时程分析方法对限位器设计方法的有效性进行了评估.结果表明,所提设计方法能够有效地设计约束伸缩缝处墩梁相对位移的缆索限位器刚度,但设置缆索限位器后过渡墩的抗震要求有一定的增加.The method to define the maximum available relative displacement （MARD） of girder bridges is presented first. Based on the existing restrainer design methods for in-span hinges of frame bridges, different simplified mechanical models are proposed according to the different characteristics and positions of the expansions of continuous bridges with laminated rubber bearings. The nonlinear properties of sliding between laminated rubber bearings and main girders, restrainers and expansion gap are included in the simplified models. The restrainer design method for each simplified model is proposed. The effectiveness of the design methods is verified by designing restrainers for an example bridge. The results from nonlinear time history analysis show that restrainers determined by the methods perform well and effectively prevent unseating of the bridge. Meanwhile the seismic demands of the piers with restrainers are increased.

关 键 词：连续梁桥 缆索限位器 有效搭接长度 限位器刚度 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]