嘉鱼长江公路大桥斜拉索阻尼器研发与应用  

Stay Cable Damper Development and Application on Jiayu Changjiang River Highway Bridge

作　　者：赵海威 柴小鹏 王泽豪 ZHAO Hai-wei;CHAI Xiao-peng;WANG Ze-hao(State Key Laboratory for Health and Safety of Bridge Structures,Wuhan 430034,China;China Railway Britech Co. ,Ltd. ,Wuhan 430034,China;China Railway Bridge Science Research Institute,Ltd. ,Wuhan 430034,China)

机构地区：[1]桥梁结构健康与安全国家重点实验室,湖北武汉430034 [2]中铁桥研科技有限公司,湖北武汉430034 [3]中铁大桥科学研究院有限公司,湖北武汉430034

出　　处：《世界桥梁》2021年第6期90-95,共6页World Bridges

基　　金：湖北省技术创新专项项目(2018AAA029)。

摘　　要：嘉鱼长江公路大桥主桥为主跨920 m的双塔七跨连续不对称空间双索面混合梁斜拉桥,斜拉索最长达494.635 m,自振频率最低仅为0.228 Hz,风、风雨及交通等外部荷载激励作用极易引起斜拉索大幅振动。为有效抑制斜拉索振动,在既有杠杆质量阻尼器基础上,通过构造设计和参数优化,研发了一种双杆式新型杠杆质量阻尼器。为验证减振效果,对安装阻尼器前、后的试验索进行测试,并在全桥安装阻尼器后随机抽取一定数量的斜拉索进行测试。结果表明:试验斜拉索安装阻尼器后对数衰减率是未安装阻尼器的6倍;安装阻尼器后,斜拉索阻尼对数衰减率在3%以上,可为斜拉索提供足够的附加阻尼,满足斜拉索减振要求。The main bridge of Jiayu Changjiang River Highway Bridge is a two-pylon hybrid girder cable-stayed bridge with a main span of 920 m.The superstructure consists of seven continuous spans and the stay cables are fanned out in asymmetrical spatial double cable planes.The longest stay cable measures 494.635 m,the smallest natural frequency is 0.228 Hz,indicating that the stay cables are prone to vibrations induced by external loads,such as wind,rain and traffic loads.To effectively suppress the vibration of stay cables on the bridge,a novel type of double-rod lever mass dampers are developed,which are evolved from the conventional lever mass damper,upon structural modification and parameter optimization.The performances of test cables before and after the installation of the dampers were compared to verify the vibration suppression effect of the dampers.Once the whole bridge was fitted with dampers,a number of stay cables were randomly selected for test.The logarithmic decrements of the stay cables with dampers are six times of the stay cables without dampers.The logarithmic decrement of the stay cables is above 3%,proving that the double-rod lever mass dampers can provide sufficient additional damping for the stay cables and the vibration amplitude of the stay cables reaches the required level.

关 键 词：斜拉桥 斜拉索 振动 杠杆质量阻尼器 对数衰减率 研发 应用 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]