行波激励下多跨单索面矮塔斜拉桥主墩索塔地震响应研究  

Seismic response of the main pier pylon of a multispan extradosed cable-stayed bridge with a single cable plane under traveling wave excitation

作　　者：赵立财 ZHAO Licai(Department of Civil and Construction Engineering,National Taiwan University of Science and Technology,Taipei 10607,Taiwan,China;The Third Engineering Co.,Ltd.,China Railway 19th Bureau Group Corporation Limited,Shenyang 110136,Liaoning,China)

机构地区：[1]台湾科技大学营建工程系,中国台湾台北10607 [2]中铁十九局集团第三工程有限公司,辽宁沈阳110136

出　　处：《地震工程学报》2025年第2期263-269,共7页China Earthquake Engineering Journal

基　　金：辽宁省“兴辽英才计划”青年拔尖人才资助项目(XLYC2007146);中国铁建股份有限公司科技研究开发计划项目(2020-C20)。

摘　　要：为探究行波激励对多跨矮塔斜拉桥地震响应的影响,选取某六跨单索面-矮塔斜拉桥为工程背景,采用MIDAS/Civil有限元软件建立全桥有限元模型,并根据相对运动法理论模拟多点激励行为。分析桥墩墩底、桥塔塔底以及桥塔塔顶这3个关键位置处在多点地震动激励作用下的内力或位移响应,并探究不同视波速下结构内力与位移的变化规律。研究结果表明:行波激励对多跨矮塔斜拉桥的地震响应产生显著影响。当视波速为500 m/s时,最不利关键位置处的内力或位移均约为一致激励时的1.2倍;行波激励对中墩底部的弯矩与剪力、边塔塔底的弯矩与剪力和塔顶位移均产生不利影响;随着视波速的提升,行波激励的影响逐渐减弱,当视波速大于7000 m/s时,关键结构处的内力与位移与一致激励时对应的内力与位移基本保持一致,此时行波激励效应对结构关键位置处内力的影响可忽略不计。A six-span extradosed cable-stayed bridge with a single cable plane was investigated in this study to assess the influence of wave traveling effect on the earthquake response of multispan extradosed cable-stayed bridges.A finite element model of the full bridge was established using the software MIDAS/Civil,and the multi-point excitation behavior was simulated based on the theory of relative motion.The internal force or displacement response of three key positions,namely pier bottom,tower bottom,and tower top,under multipoint ground motion excitation were analyzed.Furthermore,the variation law of structural internal force and displacement under different apparent wave velocities was also explored.The research results reveal that the traveling wave excitation has a significant effect on the earthquake response of the multispan extradosed cable-stayed bridge.At an apparent wave velocity of 500 m/s,the internal forces or displacements at the most unfavorable key position are approximately 1.2 times those under uniform excitation.Furthermore,traveling wave excitation has adverse effects on the bending moment and shear force at the bottom of the middle pier and side tower,as well as on the displacement at the top of the side tower.As the apparent wave velocity increases,the influence of traveling wave excitation gradually weakens.When the apparent wave velocity exceeds 7000 m/s,the internal forces and displacements at key positions are basically the same as those under uniform excitation.This finding indicates that the influence of traveling wave excitation on the internal force at key positions of the structure can thus be ignored.

关 键 词：单索面 矮塔斜拉桥 行波激励 主墩 索塔 地震响应 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]