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
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P315

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Study on Seismic Response and Isolation Techniques for Concrete Filled Steel Tubular Tied Arch Bridge under Near-fault Ground Motions
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    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.

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李晓莉,李焱,周世豪.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[J].中国地震,2024,40(4):805-818

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  • 收稿日期:2024-03-05
  • 最后修改日期:2024-04-30
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  • 在线发布日期: 2025-01-02
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