基于三角形钢挡块的既有公路桥梁横向抗震性能提升效能分析  

Efficiency Analysis on Lateral Seismic Performance Improvement of Existing Highway Bridges Based on Triangular-Plate Added Damping and Stiffness Damper

作　　者：程寿山 顾冉星 贾俊峰[2] 边嘉琛 赵祥辉 李茂昌 白久林[4] CHENG Shoushan;GU Ranxing;JIA Junfeng;BIAN Jiachen;ZHAO Xianghui;LI Maochang;BAI Jiulin(Key Laboratory of Transport Industry of Bridge Detection Reinforcement Technology(Beijing),Beijing 100088,China;State Key Laboratory of Bridge Safety and Resilience,Bejing University of Technology,Beijing 100124,China;Xinjiang Transportation Research Institute Co.,Ltd.,Urumqi 830000,China;School of Civil Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]旧桥检测与加固技术交通行业重点实验室(北京),北京100088 [2]北京工业大学桥梁工程安全与韧性全国重点实验室,北京100124 [3]新疆交通科学研究院有限公司,新疆乌鲁木齐830000 [4]重庆大学土木工程学院,重庆400044

出　　处：《防灾科技学院学报》2024年第4期1-13,共13页Journal of Institute of Disaster Prevention

基　　金：旧桥检测与加固技术交通行业重点实验室(北京)开放课题资助(2021-JQKFKT-4);国家自然科学基金(52178449)。

摘　　要：针对当前连续梁桥中普通钢筋混凝土挡块韧性抗震能力不足的问题,充分利用板式橡胶支座的摩擦滑移能力,提出采用三角形板耗能钢挡块提升既有桥梁横向抗震性能的技术方案。首先推导了三角形钢板耗能挡块的力-位移关系,以板式橡胶支座位移延性为设计目标给出了三角形钢挡块提升中小跨径连续梁桥抗震能力的设计方法和流程;然后,对我国云南强震区某典型既有中小跨径连续梁进行有限元建模,采用耐震时程法评估了新型钢挡块对该连续梁桥横向抗震性能的影响,通过参数分析说明了该设计方法的可行性和有效性,并给出了关键设计参数的建议取值。结果表明:三角形钢挡块具有优异的耗能特性,可保证桥墩在强震下不发生过大损伤并有效地控制板式橡胶支座的横向水平位移;设计参数合理的情况下,所提出的三角形钢板耗能挡块设计方法是有效的,综合考虑安全性与经济性给出了最优设计参数。In view of the insufficient seismic capacity of reinforced concrete retainers in continuous girder bridges with laminated rubber bearings,and making full use of the friction sliding capability of plate rubber bearings,we proposed a technical scheme to improve the lateral seismic performance of existing bridges by triangular-plate added damping and stiffness damper(TADASD).Firstly,we derived the mechanical properties of TADASD.Taking the displacement ductility of the plate rubber bearing as the design goal,we gave the design method and flow of TADASD to improve the seismic capacity of smalland-medium-span continuous girder bridges.Secondly,we established the finite-element modeling of a typical existing smalland-medium-span continuous girder bridges in strong earthquake area of Yunnan,and evaluated the lateral seismic performance of the impact of TADASD on it by endurance time analysis.The feasibility and effectiveness of the design method was demonstrated through parameter analysis,and the recommended values of key design parameters are given.The results show that the TADASD has satisfactory energy dssipation capacity,which can ensure that the pier does not have excessive damage under strong earthquakes and effectively control the lateral horizontal displacement of the laminated rubber bearings.When the design parameters are reasonable,the proposed design method of TADASD is effective.Finally,the optimal design parameters are given by comprehensively considering safety and economy.

关 键 词：既有连续梁桥 板式橡胶支座 钢挡块 设计方法 耐震时程分析 

分 类 号：TU997[建筑科学—市政工程]