高速公路多联连续梁桥隔震研究  

Seismic isolation analysis of highway multilink continuous girder bridges

作　　者：李超 牟江亭 张宇 田利[1] LI Chao;MOU Jiangting;ZHANG Yu;TIAN Li(School of Civil Engineering,Shandong University,Ji′nan 250061,China;Shandong Hi-Speed Engineering Construction Group Co.,Ltd.,Ji′nan 250014,China)

机构地区：[1]山东大学土建与水利学院,山东济南250061 [2]山东高速工程建设集团有限公司,山东济南250014

出　　处：《哈尔滨工程大学学报》2024年第4期682-690,共9页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(52208178).

摘　　要：针对高速公路多联连续梁桥的抗震问题,本文对铅芯橡胶支座和摩擦摆支座进行了隔震效应分析与设计优化。本文基于多联有限元模型和非线性时程分析方法,分析了多联体系下各墩地震响应的差异,及铅芯橡胶支座和摩擦摆支座的隔震和耗能效果,并对隔震支座的参数布置进行了优化。结果表明:多联桥梁交界墩的地震响应较联内墩一般增大20%以上,交界墩上部结构跨径差异较大时甚至可达75%。铅芯橡胶支座位移限制能力和大震耗能更好,且屈服前刚度越大、屈服强度和屈服后刚度越小,滞回耗能能力越强;摩擦摆支座小震时即可发挥其隔震效果,且滑动摩擦系数越小、曲率半径越大,隔震效果越好。通过在交界墩布置更多隔震支座可在保证一定隔震率的同时改善桥墩受力不均匀的问题,具有一定的工程参考价值。This study focuses on the seismic isolation analysis of highway multilink continuous girder bridges and op-timization of the lead-core rubber and friction pendulum bearings.The variations in seismic response among piers were examined first using nonlinear time history analysis of multilink finite element models.The seismic isolation and energy dissipation capabilities of lead-core rubber and friction pendulum bearings were then evaluated and com-pared.In the end,the parameters and layout of the isolation bearings were optimized.The results reveal that the seismic response of the junction pier between adjacent links is generally higher than that of the inner piers by ap-proximately 20%and can even reach 75%when the spans above the junction pier exhibit large difference.The lead-core rubber bearing exhibits superior displacement-limiting and energy dissipation capacities during high inten-sity earthquakes.A larger stiffness prior to yielding,along with lower yield strength and post-yielding stiffness,can enhance the energy dissipation capacity.Instead,the friction pendulum bearing can demonstrate an effective isola-tion effect even during minor earthquakes.A smaller the sliding friction coefficient and a larger radius of curvature lead to a better seismic isolation effect.By arranging more isolation bearings at the junction piers,the problem of uneven responses among piers can be improved while maintaining an acceptable isolation rate.This study offers considerable engineering implications.

关 键 词：高速公路桥 多联连续梁桥 桥梁隔震 隔震支座 铅芯橡胶支座 摩擦摆支座 支座布置优化 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]