铁路自复位桥墩墩顶位移控制方法研究
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作者单位:

1.兰州交通大学, 甘肃 兰州 730070 ; 2.中铁二院工程集团有限责任公司, 四川 成都 610031

作者简介:

黄耀斌(1995-),男,博士研究生,主要从事桥梁抗震及减隔震研究。E-mail:huangyaobinbridge@163.com。

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中图分类号:

U442.59

基金项目:

国家自然科学基金项目(52278186,52068041);兰州交通大学天佑创新团队(TY202007);中国中铁股份有限公司科技研究开发计划课题 (实用技术2022-重大-01)


Control methods for pier-top displacement in self-centering railway bridge piers
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Affiliation:

1.Lanzhou Jiaotong University, Lanzhou 730070 , Gansu, China ;2.China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031 , Sichuan, China

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    摘要:

    针对近断层地震下铁路自复位桥墩墩顶易产生较大位移的问题,提出了三种墩顶位移控制方法,分别为增大扩大基础尺寸、增设预应力钢筋及耗能钢筋。以某铁路桥梁为工程背景,将其18号墩设计为自复位桥墩,基于OpenSees平台建立分析模型,输入7条近断层地震动记录,进行非线性时程分析,探究三种方法对自复位桥墩墩顶位移反应的控制效果。结果表明:三种方法均可实现对墩顶位移的控制,耗能钢筋方案的控制效果最佳,增加扩大基础尺寸方案的控制效果次之,预应力钢筋方案的控制效果较弱。三种方法实现对墩顶位移控制的同时均会增大墩底地震弯矩。

    Abstract:

    To address excessive displacement at the top of self-centering railway bridge piers during near-fault earthquakes, this study introduces three control methods: enlarging the spread foundation dimensions, adding prestressed steel bars, and integrating energy-dissipating steel bars. Taking the 18# pier from a self-centering railway bridge design as a practical example, an analytical model was developed based on the OpenSees platform. Nonlinear time-history analysis was performed using seven near-fault ground motion records to assess the control efficacy of the three methods on pier-top displacement. The results demonstrate that all three methods effectively control displacement, with the scheme of energy-dissipating steel bars exhibiting the most pronounced mitigation effect, followed by the enlarged foundation scheme. However, the prestressed steel bars exhibit relatively lower effectiveness in displacement control. Notably, all methods increase the seismic bending moment at the pier base while achieving displacement control at the pier top.

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黄耀斌,夏修身,钟亚伟,等.铁路自复位桥墩墩顶位移控制方法研究[J].地震工程学报,2025,47(5):1102-1108. DOI:10.20000/j.1000-0844.20240411002

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  • 收稿日期:2024-04-11
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  • 在线发布日期: 2025-07-29
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