考虑碰撞效应的桥台-引桥-刚构连续梁桥体系地震响应分析  

Seismic response analysis of abutment-approach bridge-rigid frame continuous girder bridge system considering collision effect

作　　者：邬晓光[1] 魏俊杰 胡科坚 张文韬 WU Xiaoguang;WEI Junjie;HU Kejian;ZHANG Wentao(School of Highway,Chang’an University,Xi’an 710064,China)

机构地区：[1]长安大学公路学院,陕西西安710054

出　　处：《武汉大学学报（工学版）》2023年第4期429-439,共11页Engineering Journal of Wuhan University

基　　金：陕西省交通运输厅科研项目(编号:18-19T)。

摘　　要：为研究伸缩缝处碰撞效应对桥台-引桥-刚构连续梁桥体系地震响应的影响,以某实际原型桥为研究对象,充分考虑碰撞能量耗散、桩土相互作用、桥台与台后填土相互作用以及支座和桥墩的非线性行为,基于CSIBridge建立了桥台-引桥-刚构连续梁桥结构体系的碰撞弹塑性动力分析模型。利用调幅后的天然地震波和人工地震波分析了碰撞对桥台、引桥和刚构连续梁桥地震响应的影响,结果表明:碰撞显著增大了引桥梁体位移和墩梁间相对位移,增大了左右引桥梁体落梁风险;碰撞增大了引桥墩顶位移、墩底弯矩和桩基截面弯矩,改变率均在10%以内且处于安全范围内;碰撞减小了刚构连续梁桥刚构墩墩底弯矩和墩顶位移,最大改变率分别为-13%、-4.9%,对活动墩基本无影响;桥台纵向位移、台后填土被动土压力和桥台桩基截面弯矩显著增大,最大改变率分别为1230%、116.0%和428.5%。研究表明,伸缩缝处碰撞效应对桥台-引桥-刚构连续梁桥体系地震响应影响显著。In order to study the impact of collision effect at expansion joints on the seismic response of abutmentapproach bridge-rigid frame continuous girder bridge,an actual prototype bridge was taken as the research object.The impact energy dissipation,pile-soil interaction,interaction between abutment and backfill,and nonlinear behavior of support and pier were fully considered,and the impact elastoplastic dynamic analysis model of abutment-approach bridge-rigid frame continuous girder bridge system was established based on CSIBridge.On this basis,the impact of collision on the seismic response of abutment,approach bridge and rigid frame continuous girder bridge was analyzed by using the natural seismic wave and artificial seismic wave after amplitude modulation.The analysis results show that the impact significantly increases the position displacement and the relative displacement between piers and beams,and increases the risk of beam falling down of the bridge body.At the same time,the impact increases the displacement at the top of the bridge pier,the bending moment at the bottom of the pier and the bending moment at the section of the pile foundation,and the change rates are all within 10%and within the safe range.The impact reduces the bending moment at the bottom of rigid frame pier and the displacement at the top of rigid frame pier of rigid frame continuous girder bridge,and the maximum change rates are-13%and-4.9%,respectively,which have little effect on the movable pier.The longitudinal displacement of abutment,the passive earth pressure behind the abutment and the bending moment of abutment pile section increase significantly,and the maximum change rates are 1230%,116.0%and 428.5%,respectively.The results show that the impact effect at the expansion joints has a significant effect on the seismic response of abutment-approach bridge-rigid frame continuous girder bridge system.

关 键 词：碰撞 地震 刚构连续梁桥 桥台 引桥 地震响应 

分 类 号：U448.215[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]