下承式钢管混凝土系杆拱桥近断层地震响应分析及减震技术研究
Study on Seismic Response and Isolation Techniques for Concrete Filled Steel Tubular Tied Arch Bridge under Near-fault Ground Motions
李晓莉 1李焱 1周世豪1
作者信息
- 1. 大连海事大学道路与桥梁工程研究所,辽宁大连 116026;辽宁省近海桥隧工程重点实验室,辽宁大连 116023
- 折叠
摘要
本文以泉州百崎湖大桥为背景,采用Midas Civil桥梁有限元分析软件,研究桥梁在近断层地震作用下的地震响应.分析各种因素对桥梁地震响应的影响,包括近断层地震输入模式、近断层地震动脉冲效应和近断层竖向地震动.基于原桥结构设置摩擦摆支座和粘滞阻尼器,研究减震装置对桥梁地震响应的影响;改变减震装置参数,分析参数敏感性.研究表明,近断层地震输入模式改变了拱圈的竖向位移响应,在桥梁抗震设计和分析中,采取三向地震动输入模式较安全;脉冲效应会放大桥梁的位移响应,拱肋横桥向位移放大效果最明显;竖向地震动会放大拱肋的弯矩响应,影响系数最大为1.652;设置摩擦摆支座和粘滞阻尼器均可以提高桥梁的抗震性能.
Abstract
This study investigates the seismic response of the Quanzhou Baiqi Lake Bridge under near-fault earthquake conditions using the Midas Civil bridge finite element analysis software.Various factors influencing the seismic response of the bridge are analyzed,including the near-fault seismic input mode,the pulse effect of near-fault ground motion,and the impact of vertical ground motion.The study also examines the influence of damping devices,specifically,friction pendulum bearings and viscous dampers-on the seismic performance of the bridge.By varying the parameters of the damping devices,the sensitivity of the seismic response to these parameters is also analyzed.The results show that the near-fault earthquake input mode significantly affects the vertical displacement response of the arch ring.For seismic design and analysis,the three-dimensional ground motion input mode is found to be a safe and effective approach.The pulse effect associated with near-fault motion amplifies the displacement response,with the most noticeable effect observed in the transverse displacement of the arch rib.Additionally,vertical ground motion increases the bending moment response of the arch rib,with a maximum influence coefficient of 1.652.The study concludes that the seismic performance of the bridge can be enhanced by incorporating friction pendulum bearings and viscous dampers.
关键词
钢管混凝土拱桥/近断层地震/输入模式/脉冲效应/竖向地震动Key words
Concrete filled steel tube arch bridge/Near-fault earthquake/Input mode/Pulse effect/Vertical ground motion引用本文复制引用
出版年
2024
NETL
NSTL
万方数据