双座串联大跨度斜拉桥粘滞阻尼器参数分析  

Parameter analysis of viscous damper for two series-connected long-span cable-stayed bridges

作　　者：沈文爱 黄鸣柳 朱宏平[1] 何友娣[2] 张强[2] SHEN Wenai;HUANG Mingliu;ZHU Hongping;HE Youdi;ZHANG Qiang(School of Civil Engineering and Mechanics,Huazhong University of Science and Technology,Wuhan 430074,China;China Railway Major Bridge Reconnaissance and Design Institute Co.,Ltd.,Wuhan 430056,China)

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]中铁大桥勘测设计院集团有限公司,湖北武汉430056

出　　处：《世界地震工程》2020年第4期155-162,共8页World Earthquake Engineering

基　　金：中铁大桥勘测设计院集团公司科技项目;国家自然科学基金重点项目(51838006);湖北省自然科学基金面上项目(2018CFB429)。

摘　　要：以双座串联大跨度斜拉桥-珠海洪鹤大桥为背景,根据桥梁自振特性及场地效应,生成了三组人工波,采用纵向+2/3竖向的地震作用组合输入方式,通过非线性时程分析,系统的研究了粘滞阻尼器对双座串联大跨度斜拉桥减震性能的影响。同时为了确定粘滞阻尼器的最优参数,对粘滞阻尼器的阻尼系数C和速度指数α进行了参数敏感性分析。结果表明:设置纵向粘滞阻尼器能够显著减小双座串联斜拉桥的纵向位移响应,减小主梁在串联处发生碰撞的概率,同时改善主塔塔底结构受力情况,具有良好的耗能减震效果。综合考虑安全性、适用性和经济性等方面,最后给出针对洪鹤大桥的最优粘滞阻尼器参数:速度指数α为0.3,阻尼系数C为3000kN/(m/s)0.3。This paper presents the seismic response control of two series-connected long-span cable-stayed bridges using viscous dampers.According to the natural vibration characteristics and site effect of the bridge,three groups of artificial waves are generated,adopting longitudinal+2/3 vertical seismic action combination input method.Parametric analysis is conducted to search the optimal damping coefficient C and the optimal velocity indexαof the viscous dampers using time-history analysis.Numerical results show that the viscous damper can effectively reduce the longitudinal displacement response of the structure,thus reducing the probability of collision between the main beams,and reducing the stress of the main tower at bottom.Taking into account safety,applicability,cost and other aspects,the optimal parameters of the viscous dampers for Honghe bridge are given by:the velocity indexαis 0.3,and the damping coefficient C is 3000kN/(m/s)0.3.

关 键 词：大跨度斜拉桥 双座串联 粘滞阻尼器 参数优化 纵向减震体系 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]