行波效应对近断层高低塔斜拉桥地震响应的影响  

Influence of traveling wave effect on seismic response of near-fault cablestayed bridge with high-low towers

作　　者：赖珍康 薛小强[1] 吕龙[1] 袁宇航 LAI Zhenkang;XUE Xiaoqiang;LYU Long;YUAN Yuhang(College of Environment and Civil Engineering,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学环境与土木工程学院,四川成都610059

出　　处：《交通科学与工程》2024年第4期76-84,共9页Journal of Transport Science and Engineering

基　　金：国家自然科学基金资助项目(52108113)。

摘　　要：以一座高低塔斜拉桥为研究对象,采用大质量法模拟非一致激励进行地震响应分析。研究不同纵向约束体系下考虑行波效应的脉冲型近断层高低塔斜拉桥的地震响应;探讨不同地震动类型与地震动传播方向下高低塔斜拉桥地震响应受行波效应的影响规律;分析不同脉冲周期地震动作用下斜拉桥地震响应随脉冲周期的变化规律。研究结果表明:相比于纵向阻尼体系与半漂浮体系斜拉桥,固结体系斜拉桥地震响应对视波速的变化更敏感;不同地震动输入方向下行波效应对斜拉桥地震响应影响规律有所不同;当视波速较小时,视波速对高塔和低塔内力差异影响较大;纵向阻尼体系斜拉桥地震响应随着脉冲周期的增大整体上呈先增大后减小的趋势。塔底内力随视波速的变化规律受脉冲周期的影响显著,当视波速较大,且脉冲周期与斜拉桥纵向一阶周期接近时,斜拉桥地震响应达到最大值。Taking a cable-stayed bridge with high-low towers as the research object,the large mass method is employed to simulate non-uniform excitation for seismic response analysis.The seismic response of cable-stayed bridge with high-low towers under pulse-type near-fault earthquake considering traveling wave effect under different longitudinal constraint systems was studied.The effect of traveling wave on seismic response of cable-stayed bridge with high-low towers under different ground motion types and ground motion propagation directions was discussed.The variation of seismic response of cable-stayed bridge with pulse period under different pulse period ground motion was analyzed.Results show that the seismic response of cable-stayed bridge with consolidation system is more sensitive to the change of apparent wave velocity than that of cable-stayed bridge with longitudinal damping system and semi-floating system.The influence of traveling wave effect in different seismic input directions on the seismic response of cable-stayed bridges differs.When the apparent wave velocity is low,the difference of internal force between high tower and low tower is greatly influenced by the apparent wave velocity.The seismic response of cable-stayed bridge with投稿网址:https://jtkxygc.csust.edu.cn/jtkxygc/home longitudinal damping system increases first and then decreases with the increase of pulse period.The variation of the internal force at the bottom of the tower with the apparent wave velocity is significantly affected by the pulse period.When the apparent wave velocity is high and the pulse period is close to the longitudinal first-order period of the cable-stayed bridge,the seismic response of cable-stayed bridge reaches the maximum.

关 键 词：近断层 行波效应 约束体系 大质量法 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]