摘要
为研究主缆-索鞍摩擦效应对悬索桥顺桥向地震响应的影响规律,以某主跨760 m的公路悬索桥为背景,建立全桥非线性有限元模型,采用动力时程分析,研究主缆-索鞍界面摩擦系数对界面滑移、结构损伤、关键截面抗震性能等结构响应的影响。结果表明:在设计地震下主缆-索鞍界面没有滑移,在极罕遇地震下,界面产生残余摩擦滑移,且滑移量随摩擦系数减小而显著增大;考虑界面滑移后对桥塔和桩基的损伤较为明显,当界面摩擦系数较小时可保护塔底截面安全;在设计地震下,各模型塔底抗震性能良好,在极罕遇地震下,界面摩擦系数不超过0.15时可提升桥塔抗震性能;悬索桥抗震设计时界面摩擦系数取0.15对桥塔设计是有利的。
The main cable-saddle friction effect on seismic responses of the suspension bridge is studied.Based on an existing road suspension bridge with a main span of 760 m,a full-bridge non-linear finite element model was developed to conduct dynamic time-history analysis.The influence of main cable-saddle friction coefficient on the interface slippage,structural damages and seismic performance of key cross-sections was investigated.No main cable-saddle interface slippage was observed under design earthquakes,while under extremely rare earthquakes,residual interface friction slippage occurred,and the slippage significantly increased as the friction coefficient decreased.When the interface slippage was considered,the earthquake-induced damages in the towers and pile foundations were significant,and smaller interface friction coefficient is beneficial to the safety of tower bottom cross-section.Under design earthquakes,the tower bottom seismic performances of all the models were good.The towers showed better seismic performance when the interface friction coefficient was less than 0.15.It is beneficial to draw an interface friction coefficient of 0.15 in the seismic design of the suspension bridge.
作者
乔雷涛
段佳宏
刘明龙
邓开来
宋伏祥
QIAO Lei-tao;DUAN Jia-hong;LIU Ming-long;DENG Kai-lai;SONG Fu-xiang(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi′an 710043,China;Department of Bridge Engineering,Southwest Jiaotong University,Chengdu 610031,China;CRCC Chongqing Investment Group Co.,Ltd.,Chongqing 400700,China)
出处
《世界桥梁》
北大核心
2023年第1期94-99,共6页
World Bridges
基金
国家自然科学基金项目(U21A20154)
四川省科技计划项目(2022JDRC0012)
中国铁建股份有限公司科研计划课题(17-C06-2)。
关键词
悬索桥
主缆-索鞍界面
摩擦滑移
摩擦系数
地震响应
有限元法
suspension bridge
main cable-saddle interface
friction slippage
friction coefficient
seismic response
finite element method
