超大跨悬索桥缆-塔自平衡体系抗震性能研究  

Seismic Performance of Cable-pylon Self-balanced System of Large Span Suspension Bridge

作　　者：赵阳[1] 郝海龙[2] 王昆鹏 温佳年 刘高 ZHAO Yang;HAO Hai-long;WANG Kun-peng;WEN Jia-nian;LIU Gao(Jiangsu Provincial Communications Engineering Construction Bureau,Nanjing 210004,China;CCCCHighway Consultants Co.Ltd.,Beijing 100010,China;CCCC Highway Bridges National Engineering Research Center Co.Ltd.,Beijing,100088,China)

机构地区：[1]江苏省交通工程建设局,南京市210004 [2]中交公路规划设计院有限公司,北京市100010 [3]中交公路长大桥建设国家工程研究中心有限公司,北京市100088

出　　处：《公路》2023年第6期40-46,共7页Highway

基　　金：中国交通建设集团有限公司科技项目,项目编号YSZX-01-2021-01-B。

摘　　要：以采用缆-塔自平衡体系的张靖皋长江大桥为研究背景,建立了三维动力分析模型,对超大跨悬索桥缆-塔自平衡体系的振动特性、关键参数、抗震性能及空间地震动影响进行了分析。研究结果表明:自平衡体系南、北塔主塔-梁相对位移相较于缆塔固结体系减小了61%,南、北塔塔底弯矩相对位移相较于缆塔固结体系减小了60%和40%,索鞍滑动位移小于限位间隙(0.4 m),由于固结体系和自平衡体系横向力学特性相近,因此其横向地震响应相差不大;考虑地震动空间效应后,地震响应的相位和幅值较一致激励均发生了变化,其中梁端位移变化最大,相较于一致激励增大了14.8%。综上所述,张靖皋长江大桥采用缆-塔自平衡体系相较于对应的固结体系抗震性能更优。the Zhang-Jing-gao Yangtze River Bridge with the cable-tower self-balancing system being the research background,a three-dimensional dynamic analysis model is established,and the vibration characteristics,critical parameters,seismic performance and spatial ground motion effects on the largespan suspension bridge cable-pylon self-balancing system are analyzed.The research results show that the relative displacement of the main tower-beam of the south and north towers in the self-balancing system is reduced by 61%compared with the consolidation system,and the relative displacement of the bending moment at the bottom of the south and north towers is reduced by 60%and 40%compared with the consolidation system,and the sliding displacement of the cable saddle is O.4 m less than the limit gap.Since the lateral mechanical properties of the consolidation system and the self-balancing system are similar,there is little difference in the lateral seismic response.When considering the spatial effect of ground motion,the seismic response compared with the consistent excitation,the phase and amplitude of the beam are changed,and displacement change at the beam end is the largest,which is 14.8%higher than that of the uniform excitation.Therefore,the cable-tower self-balancing system of large-span suspension bridges has better seismic performance than the corresponding consolidation system.

关 键 词：桥梁工程 缆-塔自平衡体系 超大跨悬索桥 抗震性能 空间地震动 

分 类 号：U443.38[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程] U448.25