不同隔震支座曲线梁桥的地震响应及耗能分析

兰州理工大学学报 ›› 2025, Vol. 51 ›› Issue (5): 115-122.

不同隔震支座曲线梁桥的地震响应及耗能分析

李喜梅^*1,2, 蒲奎^1,2, 李万润^1,2, 杨国俊^1,2

1.兰州理工大学西部土木工程防灾减灾教育部工程研究中心, 甘肃兰州 730050;
2.兰州理工大学防震减灾研究所, 甘肃兰州 730050

收稿日期:2022-01-03 发布日期:2025-10-25
通讯作者: 李喜梅(1979-),女,河南商丘人,博士,副教授. Email:mei611@163.com
基金资助:
国家自然科学基金(52268028),甘肃省国合基地开放基金(GⅡ2023-D02)

Seismic response and energy dissipation analysis of curved girder bridge with different isolation bearings

LI Xi-mei^1,2, PU Kui^1,2, LI Wan-run^1,2, YANG Guo-jun^1,2

1. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China;
2. Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou730050, China

Received:2022-01-03 Published:2025-10-25

摘要/Abstract

摘要： 针对曲线梁桥由于平面不规则导致地震响应的复杂性,研究了不同隔震支座对其地震响应及耗能的影响.利用ANSYS建立天然橡胶支座(LNR)曲线梁桥有限元模型,根据规范反应谱选取地震动,输入水平双向地震动进行响应分析;另选用铅芯橡胶支座(LRB)与高阻尼橡胶支座(HDR)两种不同类型支座,分析不同支座桥梁的减隔震性能.结果表明:曲线梁桥采用LRB支座与HDR支座相对于天然橡胶支座的支座径向与切向位移响应均显著减小(减震率达66.7%、67.4%),采用LRB支座与HDR支座的总累积耗能均相对较大(最大耗能比为2.26、2.13),在工程应用中可以根据实际需求对两种支座进行选择;在不同地震动作用下,不同类型支座曲线梁桥的地震响应有较大差异,支座耗能发挥作用的起始时间各异,在抗震设计过程中应充分考虑地震动特性影响.

关键词: 曲线梁桥, 地震响应, 减震率, 耗能比

Abstract: In view of the complex seismic response of curved girder bridges caused by plane irregularity, this study investigates the effects of different isolation bearings on seismic response and energy dissipation. Finite element models with Linear Natural Rubber (LNR) bearings were established using ANSYS, and horizontal bi-directional ground motions selected from the code-based response spectrum were applied. Lead Rubber Bearings (LRB) and High Damping Rubber Bearings (HDR) were further analyzed to evaluate their seismic isolation performance. Results show that, compared with LNR bearings, LRB and HDR bearings significantly reduce radial and tangential displacements (by 66.7% and 67.4%, respectively) and exhibit larger cumulative energy dissipation (maximum ratios of 2.26 and 2.13). Both bearings demonstrate good isolation performance and can be selected according to engineering needs. However, under different ground motions, seismic responses and the onset of bearing energy dissipation vary, highlighting the necessity of considering ground motion characteristics in seismic design.

Key words: curved girder bridge, seismic response, seismic-reduction rate, energy dissipation ratio

中图分类号:

TU352.1

李喜梅, 蒲奎, 李万润, 杨国俊. 不同隔震支座曲线梁桥的地震响应及耗能分析[J]. 兰州理工大学学报, 2025, 51(5): 115-122.

LI Xi-mei, PU Kui, LI Wan-run, YANG Guo-jun. Seismic response and energy dissipation analysis of curved girder bridge with different isolation bearings[J]. Journal of Lanzhou University of Technology, 2025, 51(5): 115-122.

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