高烈度区长联PC连续梁桥减隔震措施分析  

Analysis of seismic mitigation and isolation measures for long-unit PC continuous girder bridge in high-intensity area

作　　者：李杰[1] 郝道洪 耿玉鹏 祝闯 冯腾达 LI Jie;HAO Daohong;GENG Yupeng;ZHU Chuang;FENG Tengda(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Henan Puze Expressway Co.,Ltd.,Puyang,Henan 457000,China)

机构地区：[1]郑州大学土木工程学院,郑州450001 [2]河南濮泽高速公路有限公司,河南濮阳457000

出　　处：《中国科技论文》2024年第5期575-582,共8页China Sciencepaper

基　　金：河南省交通运输科技计划项目(2021J2)。

摘　　要：为了明确高烈度区长联预应力混凝土(prestressed concrete,PC)连续梁桥滑动摩擦摆式支座的减隔震性能,针对设防烈度为9度的某长联PC连续梁桥,利用CSiBridge软件建立大桥空间梁单元非线性分析模型,以普通球型钢支座地震响应为基准,对比分析铅芯橡胶支座与滑动摩擦摆式支座的减隔震性能,并对滑动摩擦摆式支座的摩擦系数和支座曲率进行参数分析。结果表明:在长联连续梁桥中,相比于铅芯橡胶支座,滑动摩擦摆式支座减隔震效果更好,固定墩内力与变形更小,全桥受力更加均匀合理;对于滑动摩擦摆式支座,摩擦系数越大,长联连续梁固定墩墩底弯矩与墩顶位移越大,摩擦系数变化20%,固定墩墩底弯矩最大值变化约1.67%,墩顶位移极值变化约1.45%;支座曲率半径对长联连续梁地震响应的减隔震性能影响较小,曲率半径增大1.5 m,固定墩墩底弯矩最大值增大约0.97%,固定墩墩顶位移增幅约为0.37%~1.39%。In order to clarify the seismic mitigation and isolation performance of sliding friction pendulum bearings of long continuous prestressed concrete(PC)girder bridges in high seismic intensity areas,a nonlinear analysis model of space beam element of a longunit PC continuous girder bridge with seismic fortification intensity of 9 degrees was established using CSiBridge software.Based on the seismic response of ordinary spherical steel bearing,the seismic isolation performance of lead rubber bearing and sliding friction pendulum bearing was compared and analyzed,and the friction coefficient and bearing curvature of sliding friction pendulum bearing were analyzed.The results show that,compared with the lead rubber bearing,the sliding friction pendulum bearing has better seismic isolation effect,less internal force and deformation of the fixed pier,and more uniform and reasonable force for the long-unit continuous girder bridge.For sliding friction pendulum bearings,the greater the friction coefficient,the greater the bending moment at the bottom of the fixed pier and the displacement at the top of the pier of the long continuous beam.The amplitudes of variation for friction coefficient,maximum bending moment at the bottom of the fixed pier,and the extreme displacement at the top of the pier were found to be 20%,1.67%,and 1.45%,respectively.The radius of curvature of sliding friction pendulum bearing has little effect on the seismic isolation performance of the long continuous beam.The radius of curvature increases by 1.5 m,the maximum bending moment at the bottom of the fixed pier increases by 0.97%,and the displacement at the top of the fixed pier increases by 0.37%-1.39%.

关 键 词：高烈度区 长联连续梁桥 减隔震 滑动摩擦摆式支座 

分 类 号：U448.22[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]