非规则连续梁桥应用锁死销减震控制  

Seismic control of irregular continuous bridge with locking dowel

作　　者：张文学[1] 陈士通[1,2] 杜修力[1] 李义强[2] ZHANG Wenxue;CHEN Shitong;DU Xiuli;LI Yiqiang(College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China;Hebei Engineering Research Center for Traffic Emergency and Guarantee,Shijiazhuang Tiedao University, Shijiazhuang 050043, China)

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]石家庄铁道大学河北省交通应急保障工程技术研究中心,河北石家庄050043

出　　处：《中南大学学报（自然科学版）》2017年第12期3384-3391,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51378034;51678376);北京市自然科学基金资助项目(8122007)~~

摘　　要：为解决地震荷载作用下连续梁桥固定墩因单独承受上部结构纵向地震荷载而受损的问题,设计安装于滑动墩和梁体之间的锁死销减震装置,以便在地震突发时协同固定墩和滑动墩共同承受纵向地震荷载,提高连续梁桥整体抗震性能。鉴于非规则连续梁桥各墩抗侧移刚度差异较大,为合理利用非规则连续梁桥各滑动墩的抗震潜能,研究非规则连续梁桥利用锁死销减震的控制方式。以某七跨非规则连续梁桥为研究对象,建立有限元模型,分析非规则连续梁桥应用锁死销减震的地震响应。在此基础上,基于各桥墩抗侧移刚度相近和各墩承受最大剪力相等的原则,通过调整锁死销的连接刚度和滑动极限承载力,对非规则连续梁桥锁死销减震进行优化。研究结果表明:非规则连续梁桥利用锁死销减震可显著提高连续梁桥抗震性能,但会出现地震荷载向矮墩集中的现象。调整锁死销连接刚度和滑动极限承载力可有效调整各滑动墩所承受的地震荷载,避免矮墩集中损伤的出现,达到各墩协同受力的效果。The fixed-pier of continuous bridges almost bear all the longitudinal seismic load under strong earthquakes,which can cause damage of the fixed-pier.In order to solve the above structural defects of continuous bridges,the locking dowel was designed and installed between the sliding piers and girder to share the longitudinal seismic load with the fixed-pier and improve the seismic performance of continuous bridges.Considering that the longitudinal stiffness of piers was different in irregular continuous bridges,the seismic control of irregular continuous bridges with locking dowel was studied for the reasonable use of the seismic bearing capacity of each sliding pier.The finite element model was built based on a seven-span irregular continuous bridge,and the seismic response on irregular continuous bridge with locking dowel was analyzed.Based on the principles that the lateral stiffness of each sliding pier is similar and that the ultimate bearing capacity of each locking dowel is equivalent,the seismic control of irregular continuous bridge was optimized through adjusting the connection stiffness and ultimate bearing capacity of locking dowel.The results show that the seismic performance of irregular continuous bridge can be significantly improved by setting the locking dowel between its main beam and sliding piers,but the low pier undertakes more seismic load.Adjusting the connection stiffness and ultimate bearing capacity of locking dowel effectively changes the seismic load on each sliding pier and avoids damage of low pier,which can help the piers to collaboratively bear the longitudinal seismic force.

关 键 词：连续梁桥 锁死销 减震控制 连接刚度 地震响应 

分 类 号：U442.5[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]