铁路劲性骨架混凝土拱桥减隔震方案优化研究  

Optimization of seismic isolation scheme for railway rigid skeleton concrete arch bridge

作　　者：龚婉婷 钱永久[1] 杨华平 黎璟 黄俊豪 GONG Wanting;QIAN Yongjiu;YANG Huaping;LI Jing;HUANG Junhao(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Sichuan Railway Investment Group Co.,Ltd.,Chengdu 610094,China;School of Architecture and Civil Engineering,Chengdu University,Chengdu 610106,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]四川省铁路产业投资集团有限责任公司,四川成都610094 [3]成都大学建筑与土木工程学院,四川成都610106

出　　处：《地震工程与工程振动》2023年第1期55-62,共8页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51778532)。

摘　　要：为研究不同设防烈度下铁路劲性骨架混凝土拱桥的合理减隔震方案,以某主跨为445 m的铁路混凝土拱桥为分析背景,选用SAP2000结构分析软件建立全桥空间动力有限元模型进行非线性动力时程分析,对比了多级设防烈度下不同参数的摩擦摆支座和“摩擦摆支座+连梁装置”2类减隔震方案用于铁路劲性骨架拱桥的减隔震效率。结果表明:设防烈度较低时,摩擦摆支座能在一定程度上控制拱桥结构的地震响应,设防烈度高时控制效果有限,考虑行车平顺性,应优先选取半径较大的摩擦摆支座;“摩擦摆支座+连梁装置”方案在强震作用下,结构关键位置内力响应值没有明显增大,同时,伸缩缝位移值明显降低,提升了拱桥结构地震作用下的安全性。实际工程中,推荐使用“摩擦摆支座+连梁装置”方案以提高大跨度上承式铁路劲性骨架混凝土拱桥抗震性能。To study reasonable seismic isolation schemes for railway rigid skeleton concrete arch bridges under different fortification intensities,an arch bridge with a main span of 445 m was taken as the study background.The SAP2000 software was used to establish the finite element model of the bridge,and the nonlinear dynamic time history analysis of the structure was performed.The mitigating efficiency of the arch bridge using friction pendulum bearing schemes without and with unseating prevention devices under multiple fortification intensities was compared.The results show that the friction pendulum bearings can control the seismic response of the structure to a certain extent under the low fortification intensity,but the control effect is weakened when the fortification intensity is high.The radius of the pendulum should be larger given its influence on the driving comfort.Under strong earthquakes,the internal force response of the key position of the structure does not increase obviously when using a combined seismic isolation scheme.Moreover,the displacement of the expansion joint decreases obviously,which improves the safety of the arch bridge under earthquakes.In engineering practice,friction pendulum bearings with unseating prevention devices are proposed to improve the seismic performance of long-span upper-deck railway rigid skeleton concrete arch bridges with tall piers.

关 键 词：铁路桥梁 劲性骨架混凝土拱桥 减隔震设计 摩擦摆支座 连梁装置 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]