地震作用下简支板梁桥横向滑移效应分析  

Analysis of Transverse Displacement of Simply Supported Bridge Under Earthquake

作　　者：苏俊 葛雄 魏征 潘诚 SU Jun;GE Xiong;WEI Zheng;PAN Cheng(College of Transportation,Wuhan University of Technology,Wuhan,Hubei 430063,China)

机构地区：[1]武汉理工大学交通学院,湖北武汉430063

出　　处：《公路工程》2021年第3期39-44,117,共7页Highway Engineering

基　　金：国家自然科学基金资助项目(51678459)。

摘　　要：为了进一步了解采用板式橡胶支座的简支板梁桥的横向地震响应,提高其在不同设计参数下的横向抗震能力,考虑板式橡胶支座的支座刚度、支座摩擦系数和地震波峰值加速度等因素,采用有限元软件OpenSees建立一座3×20 m的简支板梁桥三维分析模型,通过分析主梁的横向滑移、支座横向位移以及墩顶横向位移等指标,研究不同强度的支座刚度以及不同等级的地震强度组合下桥梁的横向滑移效应。研究表明:增大支座刚度或支座摩擦系数,整体上会降低主梁和支座横向位移,减小支座损坏,但会增大墩顶位移,从而对桥墩的横向受力越不利;地震波峰值加速度对桥梁横向纯滑移效应影响很大,加速度增大,桥梁横向滑移快速增大,对桥梁结构的抗震减灾越不利。因而应在桥梁设计时对支座刚度、支座摩擦系数、地震强度等设计参数进行适当的调整,以提高的桥梁的抗震性能。In order to further understand the transverse seismic response of a simply-supported bridge using a plate rubber bearing,and to improve its transverse seismic resistance under different design parameters,consider the bearing stiffness,friction coefficient,and seismic wave peak of the plate rubber bearing Acceleration,the finite element software Opensees was used to establish a 3×20 m simple-supported bridge three-dimensional analysis model.By analyzing the transverse displacement of the main beam,the transverse displacement of the support,and the transverse displacement of the pier top,the support of different strength Transverse displacement effects of bridges with a combination of seat stiffness and different levels of seismic strength.Studies have shown that increasing the stiffness of the bearing or the friction coefficient of the bearing will reduce the transverse displacement of the main beam and the bearing,and reduce the damage to the bearing,but will increase the displacement of the pier,which will adversely affect the transverse force of the pier.The peak acceleration of the seismic wave has a great influence on the transverse pure displacement effect of the bridge.The acceleration increases and the transverse displacement of the bridge increases rapidly,which is more detrimental to the earthquake resistance and disaster reduction of the bridge structure.Therefore,appropriate design parameters such as bearing stiffness,bearing friction coefficient,and seismic strength should be adjusted during bridge design to improve the seismic performance of the bridge.

关 键 词：地震响应 简支板梁桥 横向滑移 参数分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]