Influence of pier height and ground motion parameters on seismic response and energy dissipation of isolated railway bridges

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2024-09-06 DOI:10.1016/j.istruc.2024.107236

Hao Tan, Biao Wei, Weihao Wang, Binqi Xiao, Shanshan Li, Lizhong Jiang

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引用次数: 0

Abstract

The overlap between high-speed railways and earthquake areas makes it necessary to implement isolation design for railway bridges. At present, the variation of seismic energy of railway bridges with structural and ground motion parameters is not clear. In this paper, the finite element models of railway bridges with different pier heights are established and verified by shaking table tests. Then, the nonlinear time history analysis of isolated and non-isolated models is carried out, and the differences in seismic response and energy dissipation between the two models under different parameters are compared. Finally, the isolation effect of hyperbolic friction pendulum bearing (HFPB) is evaluated by using the efficacy coefficient method. Results demonstrate that HFPB can not only reduce the seismic response of the girder and the pier, but also effectively reduce the seismic input energy, structural damping energy, and pier hysteretic energy. In addition, HFPB has a better seismic isolation effect when pier height is 3–15 m, site characteristic period is 0.25–0.45 s, and earthquake PGA is 0.2–0.5 g.

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墩高和地动参数对孤立铁路桥梁地震响应和能量耗散的影响

高速铁路与地震区的重叠使得对铁路桥梁实施隔震设计成为必要。目前，铁路桥梁地震能量随结构参数和地动参数的变化尚不明确。本文建立了不同墩高铁路桥梁的有限元模型，并通过振动台试验进行了验证。然后，对隔震模型和非隔震模型进行了非线性时间历程分析，并比较了两种模型在不同参数下的地震响应和耗能差异。最后，采用功效系数法评估了双曲摩擦摆支座（HFPB）的隔震效果。结果表明，HFPB 不仅能减小大梁和桥墩的地震响应，还能有效降低地震输入能量、结构阻尼能量和桥墩滞回能量。此外，当墩高为 3-15 m、场地特征周期为 0.25-0.45 s、地震 PGA 为 0.2-0.5 g 时，HFPB 具有更好的隔震效果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.

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