| 摘要: |
| 采用Midas Civil桥梁有限元分析软件对下承式钢管混凝土系杆拱桥在近断层地震作用下的地震响应进行了研究。本文以泉州百崎湖大桥为背景,研究了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,并基于原桥结构设置摩擦摆支座和粘滞阻尼器分别研究对其抗震性能的影响以及改变减震装置参数对抗震性能的影响。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,拱肋横桥向位移最大增大2倍以上；竖向地震动会放大拱肋的弯矩响应,增幅最大达65%；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。 |
| 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 |
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| Study on Seismic Response and isolation techniques for Through Concrete Filled Steel Tubular Tied Arch Bridge under near-fault ground motions |
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Li Xiaoli, LiYan, Zhou Shihao
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Institute of Road and Bridge Engineering,Dalian Maritime University
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| Abstract: |
| Based on the background of Quanzhou Baiqi Lake Bridge, this paper studies the seismic response of the bridge under the action of near-fault earthquake by using Midas Civil bridge finite element analysis software. The influence of various factors on the seismic response of the bridge is analyzed, including the near-fault seismic input mode, the near-fault ground motion pulse effect and the near-fault vertical ground motion. Based on the original bridge structure, the friction pendulum bearing and viscous damper are set up to study the influence of the damping device on the seismic response of the bridge. Change the parameters of the damping device to analyze the sensitivity of the parameters. The research shows that the near-fault earthquake input mode changes the vertical displacement response of the arch ring. In the seismic design and analysis of the bridge, it is safe to adopt the three-dimensional ground motion input mode. The pulse effect will amplify the displacement response of the bridge, and the amplification effect of the transverse displacement of the arch rib is the most obvious. The vertical ground motion will amplify the bending moment response of the arch rib, and the maximum influence coefficient is 1.652. The seismic performance of the bridge can be improved by setting friction pendulum bearing and viscous damper. |
| Key words: Concrete filled steel tube arch bridge Near-fault earthquake Input mode Pulse effect Vertical ground motion |
