斜拉-连续梁组合结构桥梁动力特性及地震响应分析  

Analysis of Dynamic Characteristic and Seismic Response for Combined Bridge of Stayed-Cable and Continuous Beam Structure

作　　者：梁师俊[1] 朱海东[1] Liang Shi-jun , Zhu Hai-dong(Zhejiang College of Construction ,Hangzhou311231, Chin)

机构地区：[1]浙江建设职业技术学院,浙江杭州311231

出　　处：《工程抗震与加固改造》2018年第1期76-83,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：浙江省住房和城乡建设厅建设与科研推广项目(2014Z034);浙江省科技厅公益技术研究社会发展项目(2015C33052)

摘　　要：为研究斜拉-连续梁组合结构桥梁的动力特性和地震响应规律,以某高速公路预应力钢筋混凝土斜拉-连续梁组合桥(30+30+140+30+30)m为例,建立有限元空间杆系模型,分析了该桥在反应谱、一致激励、多点激励和行波效应作用下的地震响应。研究结果表明:该桥主梁截面内力主要由低阶振型控制;多点激励对主梁轴力、剪力和竖向位移有一定的放大作用;行波效应对主梁剪力的放大影响显著,对轴力、弯矩影响较小;地震作用对斜拉-连续梁组合结构桥梁连续梁段主梁内力及位移的影响均较大,不容忽视。For analyzing the dynamic characteristic and seismic response rule for combined bridge of stayed-cable and continuous beam structure,taking a（30 ＋ 30 ＋ 140 ＋ 30 ＋ 30） m stayed-cable and continuous beam structure bridge on express railway as an example,the spatial beam finite element model is established. The seismic response of the bridge is analyzed under the action of response spectrum,uniform excitation,multi-point excitation and traveling-wave effect. The analysis result shows that the girder interior force mostly depends on lower modal shapes,the multi-point excitation has some amplifying action on the girder interior force of axial force,shear force and vertical displacement; the traveling-wave effect has a remarkable impact on the girder interior force of shear force,which has little impact on the girder interior force of axial force and moment; when analyzing the seismic response for combined bridge of stayed-cable and continuous beam structure,the part of continuous beam should be considered.

关 键 词：地震响应 动力时程 部分斜拉桥 多点激励 行波效应 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]