地震下梁桥纵向限位装置限位效果振动台试验研究  

Study on the effect of longitudinal limiting device of girder bridges based on shaking table tests

作　　者：朱俊[1] 杨大海[1] 屈宏雅 Zhu Jun;Yang Da-hai;Qu Hong-ya(Anhui Transport Consulting&Design Institute Co.Ltd,Hefei 230088,China;Department of Bridge Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]安徽省交通规划设计研究总院股份有限公司,安徽合肥230088 [2]同济大学桥梁工程系,上海200092

出　　处：《工程抗震与加固改造》2025年第2期124-130,共7页Earthquake Resistant Engineering and Retrofitting

摘　　要：普通板式橡胶支座已成为我国中小跨度公路桥梁上最为常用的支座形式,但汶川地震后震害调查表明:对采用板式橡胶支座的中小跨度梁桥梁,地震作用下,由于支座与梁底钢板间发生相对滑动,从而导致主梁发生较大移位,甚至发生落梁破坏。为了研究采用缆索或黏滞阻尼器限制墩、梁相对位移、减小落梁的风险,本文以一座30m跨径的典型简支梁桥为对象,设计、制造了1/4缩比的振动台模型,采用振动台模型试验方法,研究了地震作用下缆索或黏滞阻尼器的限位效果。结果表明:地震作用下,缆索限位器和黏滞阻尼器均具有较好的位移约束作用;可有效控制强震作用下墩梁间的相对位移,同时采用缆索或黏滞阻尼器约束后,桥墩的地震反应增加较小,可避免下部结构造成严重地震损伤。For short-to-medium span highway bridges in China,laminated rubber bearings are most widely utilized between super-structures and sub-structures.However,extensive surveys after Wenchuan earthquake revealed that excessive displacement responses of girders occurred in these bridges;even falling-off failure of girders was observed,in some extreme scenarios.These phenomena are caused by the fact that bearings are usually directly placed between girders and piers without any connection,and thus sliding happens between bearings and the bottom of girders during earthquakes.This study aims to investigate the efficiency of cable-based restrainer and viscous damper in controlling the relative displacement between girders and piers,as well as reducing the falling-off failure of girders.Shaking table tests are conducted for a 1/4-scale specimen of whole bridge system that is designed based on a typical 30m-span simply-supported girder bridge prototype.The experimental results show that both the cable-based restrainer and viscous damper can effectively control the relative displacement response between the girder and the pier;while the seismic demand of piers are not substantially increased,without leading to extensive damage in the sub-structures.

关 键 词：板式橡胶支座 中小跨径桥梁 缆索限位 黏滞阻尼器 振动台试验 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U443.361[交通运输工程—道路与铁道工程]