[1]石岩,赵昊淼,初存杰,等.跨走滑断层多跨简支梁桥的限位加固与性能提升[J].长安大学学报(自然科学版),2025,45(6):154-168.
　SHI Yan,ZHAO Hao-miao,CHU Cun-jie,et al.Displacement-restrained reinforcement and performance improvement of multi-span simply-supported beam bridge across strike-slip fault[J].Journal of Chang’an University (Natural Science Edition),2025,45(6):154-168.
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跨走滑断层多跨简支梁桥的限位加固与性能提升()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第45卷
期数:
2025年6期
页码:
154-168
栏目:
桥梁智能运维与防灾减灾
出版日期:
2025-11-30

文章信息/Info

Title:
Displacement-restrained reinforcement and performance improvement of multi-span simply-supported beam bridge across strike-slip fault
文章编号:
1671-8879(2025)06-0154-15
作者:
石岩1; 赵昊淼1; 初存杰2; 韩建平1; 刘云帅1; 杨雄1
(1. 兰州理工大学 土木与水利工程学院,甘肃 兰州 730050; 2. 山东省交通规划设计院集团有限司,山东 济南 250101)
Author(s):
SHI Yan1;  ZHAO Hao-miao1;  CHU Cun-jie2;  HAN Jian-ping1; LIU Yun-shuai1;  YANG Xiong1
(1. School of Civil and Hydraulic Engineering, Lanzhou University of Technology, Lanzhou 730050,Gansu, China; 2. Shandong Provincial Communications Planning and Design Institute Group Co., Ltd., Jinan 250101, Shandong, China)
关键词:
桥梁工程;  防落梁;  有限元;  限位加固支座;  组合加固体系;  地震动合成;  走滑断层
Keywords:
bridge engineering;  unseating prevention;  finite element;  displacement-restrained reinforced bearing;  combined reinforcement system;  ground motion synthesis;  strike-slip fault
分类号:
U448.21
文献标志码:
A
摘要:
为降低简支梁桥在强震作用下的落梁风险并控制支座滑动位移,提出一种具有多级滑移与限位功能的支座,通过薄聚酯板调控滑移面的启动顺序,以环形限位钢套箍约束最大滑动位移,从而协调控制支座的滑动与限位; 基于理论分析建立了该支座的简化力学模型及力-位移关系,进一步发展了采用限位加固支座+粘滞阻尼器+防屈曲支撑(BRB)的组合加固体系,以弥补单一限位加固支座的不足; 基于OpenSees建立了4跨简支梁桥动力分析模型,以40组基于速度脉冲特性合成的跨断层地震动作为输入,系统研究了支座和桥墩等主要构件的位移响应及损伤状态,分析了限位加固支座和组合加固体系对简支梁桥抗震性能的提升效果。研究结果表明:采用限位加固支座的简支梁桥的支座峰值位移降低近30%,其限位效果与铅芯橡胶支座(LRB)相当; 限位加固支座对主梁纵向峰值位移的放大程度普遍优于LRB,且具有与LRB相当的减缓主梁旋转的性能; 与仅设置限位加固支座相比,采用组合加固体系可使主梁纵向峰值位移减小约50%,在降低桥墩横向位移的同时减轻了桥墩的损伤,增强了桥梁的整体性能。综上,提出的限位加固支座和组合加固体系可为高烈度区多跨简支梁桥在跨断层地震动作用下的防落梁能力提升和抗震设计提供参考。
Abstract:
To reduce the unseating risk of simply-supported beam bridges under strong earthquakes and to control the sliding displacement of bearings, a bearing with multi-stage sliding and displacement-restrained functions was proposed. The bearing employed a thin polyester plate to regulate the activation sequence of the sliding surface and utilized a circular limiting steel hoop to restrain the maximum sliding displacement, thus coordinately controlling the sliding and limiting of the bearing. Based on theoretical analysis, a simplified mechanical model and corresponding force-displacement relationship of the bearing were established. Furthermore, a combined reinforcement system, consisting of displacement-restrained reinforced bearing, viscous dampers, and buckling-restrained braces(BRBs), was developed to overcome the limitations of a single displacement-restrained reinforced bearing. A dynamic analysis model of a four-span simply-supported beam bridge was established using OpenSees. Forty sets of synthesized cross-fault ground motions based on velocity pulse-like characteristics were used as input. The displacement responses and damage states of critical components, such as bearings and piers, were systematically investigated. The effects of displacement-restrained reinforced bearing and combined reinforcement system on seismic performance of simply-supported beam bridges were analyzed. The research results indicate that the peak bearing displacement of simply-supported beam bridges equipped with displacement-restrained reinforced bearings reduces by nearly 30%. The limiting effect is comparable to that of lead rubber bearing(LRB). The displacement-restrained reinforced bearing generally outperforms LRB in amplifying the longitudinal peak displacement of the main girder, while exhibiting comparable performance in reducing the girder rotation. Compared with the bridge equipped only with displacement-restrained reinforced bearings, the combined reinforcement system reduces the longitudinal peak displacement of the main girder by approximately 50%. It decreases the lateral displacement of piers and mitigates pier damage, thereby enhancing the overall performance of the bridge. In conclusion, the proposed displacement-restrained reinforced bearing and combined reinforcement system can provide references for enhancing the unseating prevention capability and seismic design of simply-supported beam bridges in high-intensity seismic zones under cross-fault ground motions.4 tabs, 17 figs, 35 refs.

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备注/Memo

备注/Memo:
收稿日期:2025-05-09
基金项目:国家自然科学基金项目(52268075); 甘肃省重点研发计划项目(22YF7GA161)
作者简介:石 岩(1985-),男,甘肃通渭人,教授,工学博士,E-mail:shiyan@lut.edu.cn。
通信作者:韩建平(1970-),男,甘肃宕昌人,教授,工学博士,E-mail:jphan@lut.edu.cn。
更新日期/Last Update: 2025-12-20