基于拉索减震支座的高烈度区简支梁桥抗震性能研究

Seismic performance of simply-supported bridges in high-intensity zones using cable-sliding friction aseismic bearings

摘要

针对高烈度地区的简支梁桥采用常规隔震支座在地震作用下难以限制墩梁相对位移的问题，以某3跨40m简支梁桥为背景，利用拉索减震支座开展抗震性能优化设计分析。采用SAP2000软件建立全桥有限元模型，提出在边墩处设置拉索减震支座，对比分析了常规隔震支座和拉索减震支座两种布置形式下结构地震响应以及减震效果。结果表明:在地震作用下，拉索减震支座相较于常规隔震支座，虽会增大下部结构的地震响应，但增幅较小，下部结构在E2地震作用下仍能保持弹性工作状态，同时拉索减震支座的设置能够有效限制墩梁相对位移，避免相邻梁的碰撞甚至落梁震害的发生。

Abstract

To address the challenge of controlling pier-girder relative displacement in simply-supported beam bridges equipped with conventional seismic isolation bearings under seismic actions in high-intensity zones, this study conducts an optimized seismic performance analysis using cable-sliding friction aseismic bearings on a 3×40m simply-supported beam bridge. A full-bridge finite element model was developed in SAP2000 software, proposing the installation of cable-sliding friction aseismic bearings at the side piers. Comparative analyses of structural seismic responses and damping effectiveness were performed between conventional isolation bearings and cable-sliding friction aseismic bearings. Results indicate that while cable-sliding friction aseismic bearings slightly amplify seismic responses in substructures compared to conventional bearings, the increase remains marginal, and substructures retain elastic behavior under E2-level seismic actions. Additionally, the cable-sliding friction aseismic bearings effectively restricted pier-girder relative displacements, mitigating collision risks between adjacent girders and preventing potential unseating damage.

关键词

高烈度区 / 简支梁桥 / 拉索减震支座 / 相对位移 / 抗震性能

Key words

high-intensity zone / simply-supported bridge / cable-sliding friction aseismic bearing / relative displacement / seismic performance

参考文献

[1] Wang Yingfa, Liu Chaofu, He Neng. Analysis of ground motion parameters and seismic design of bridge engineering in high seismic intensity area[J]. Building Structure, 2023, 53(S2): 758-762. (in Chinese)

[2] Cai Liwen, Huang Yong, Zhang Haoyu, et al. Earthquake damage and enlightenment from Gongyu Expressway in 2021 Qinghai Maduo M7.4 earthquake[J]. World Earthquake Engineering, 2021, 37(3): 46-56. (in Chinese)

[3] Ye Aijun, Guan Zhongguo. Seismic design of bridges[M]. 3rd ed. Beijing: China Communications Press, 2017. (in Chinese)

[4] Shi Yan, Pei Yinhai, Zhang Zhanhong, et al. Analysis of seismic response and isolation performance of skew bridge under strong ground motions[J]. World Earthquake Engineering, 2023, 39(2): 105-112. (in Chinese)

[5] Chen Hailong, Xie Yuhang, Hong Yingwei, et al. Reasonable seismic isolation measures of intercity railway viaduct simple supported beam bridge under strong earthquake[J]. World Earthquake Engineering, 2024, 40(4): 11-20. (in Chinese)

[6] Yuan Wancheng, Wei Zhenghua, Cao Xinjian, et al. Cable-sliding friction aseismic bearing and its application in bridge seismic design[J]. Engineering Mechanics, 2011, 28(S2): 204-209. (in Chinese)

[7] Yang Haolin, Tian Shengze, Pang Yutao, et al. Shaking table test of a bridge with cable sliding isolation bearing[J]. Journal of Tongji University (Natural Science), 2016, 44(2): 192-197. (in Chinese)

[8] Wang Zhengnan, Gu Yitong, Shen Guoyu, et al. Quasi-static test on buffer cable sliding friction aseismic bearing and analysis of its seismic performance[J]. Journal of Harbin Institute of Technology, 2020, 52(9): 39-44, 84. (in Chinese)

[9] Yuan Wancheng, Gu Yitong, Dang Xinzhi, et al. Seismic performance of a buffer cable sliding friction aseismic bearing in pulse-type earthquakes[J]. Journal of Harbin Engineering University, 2018, 39(9): 1511-1516. (in Chinese)

[10] Zhong Haiqiang, Guo Junjun J, Yuan Wancheng, et al. Numerical study on seismic performance of a novel multi-level aseismic highway bridge with cable-sliding friction aseismic bearings and dissipative controlled rocking piers[J]. Engineering Structures, 2023, 275: 115253.

[11] Gao Kang, Yuan Wancheng. Seismic response analysis of cable-sliding friction pendulum bearings in curved girder bridges[J]. Earthquake Engineering and Engineering Dynamics, 2014, 34(3): 41-46. (in Chinese)

[12] Chen Zhigang, Zhao Yingce. Study of transverse seismic performance of rigid-frame bridge using cable sliding friction aseismic bearings[J]. Bridge Construction, 2014, 44(2): 38-42. (in Chinese)

[13] Li Xiaoqin. The application of CSFAB in viaduct bridge seismic design[J]. Earthquake Engineering and Engineering Dynamics, 2014, 34(2): 195-201. (in Chinese)

[14] DB51/T2241- 2016 Cable shock absorbing bearing and application technical guide[S]. (in Chinese)

[15] JTG/T2231-01- 2020 Specifications for seismic design of highway bridges[S]. (in Chinese)

[16] Yuan Wancheng, Cao Xinjian, Rong Zhaojun. Development and experimental study on cable-sliding friction aseismic bearing[J]. Journal of Harbin Engineering University, 2010, 31(12): 1593-1600. (in Chinese)

基金资助

重庆英才计划项目(cstc2022ycjh-bgzxm0133)