漂浮体系斜拉桥简化单自由度模型  

Simplified Single-degree-of-freedom Model of the Floating System Cable-stayed Bridge

作　　者：程鹏飞 李杰[1] 陈壮壮 聂利英[1] CHENG Pengfei;LI Jie;CHEN Zhuangzhuang;NIE Liying(College of Civil And Transportation Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学土木与交通学院,南京210098

出　　处：《河南科学》2018年第8期1232-1238,共7页Henan Science

基　　金：土木工程防灾国家重点实验室开放课题基金项目(SLDRCE-MB-02)

摘　　要：大跨斜拉桥减震耗能的一种典型应用是塔梁间设置纵向大型液体黏滞阻尼器,以减小地震作用下的主梁纵向位移以及改善主要构件地震力.以某大型斜拉桥为典型工程实例,首先定量分析一阶振型对于斜拉桥纵向位移(梁端位移、塔顶位移、塔梁相对位移)的贡献,然后基于一阶振型的广义质量和广义刚度发展梁端位移和塔梁相对位移的简化单自由度模型,以通过设置与不设置非线性液体黏滞阻尼器(NFVD)下全桥模型与单自由度模型分析的对比,验证单自由度模型的可行性;在此基础上,基于附加阻尼比ξsd的概念,评估大跨斜拉桥纵向设置大型NFVD对主梁纵向运动提供的附加阻尼比.A typical application in seismic design of energy dissipation is the installation of longitudinal large fluid viscous dampers(FVDs)between girder and pylons.The determination of parameters of FVDs is based on the optimal effects of longitudinal displacements of girder and seismic force of key components.Firstly The contribution of first mode to the longitudinal displacement has been analyzed,then based on generalized mass and stiffness of first mode,a single-degree-of-freedom analytical model has been developed,The feasibility of the model is verified by comparing the seismic response between full-bridge model and the single-degree-of-freedom model with and without setting the nonlinear fluid viscous dampers(NFVDs).On this basis,based on the concept of the supplemental damping ratioξsd,the supplemental damping ratio provided by NFVD to longitudinal movement of girder is evaluated.

关 键 词：大跨度斜拉桥 一阶振型 单自由度模型 附加阻尼比 非线性液体黏滞阻尼器 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]