斜拉索风雨振影响参数的理论研究  

Parameter Analysis on Rain-Wind Induced Vibrations of Stay Cables

作　　者：陈冬剑 毕伟[2] 胡云天 CHEN Dongjian;BI Wei;HU Yuntian(Jiangsu Testing Center For Quality of Construction Engineering Co.,Ltd.,Nanjing Jiangsu 210000,China;Xingtai Polytechnic College,xingtai Hebei 054000,China;CCCCC Highway Consultants Co.,Ltd,Beijing 100088,China)

机构地区：[1]江苏省建筑工程质量检测中心有限公司,南京210000 [2]邢台职业技术学院,邢台054000 [3]中交公路规划设计院有限公司,北京100088

出　　处：《结构工程师》2020年第3期109-114,共6页Structural Engineers

基　　金：2019年邢台市市级科技计划自筹经费项目(2019ZC051);江苏省住房和城乡建设厅科技项目计划(2017JH06009,2018ZD009006)

摘　　要：风雨振对于斜拉桥拉索的危害十分严重.根据理论方法推导了节段拉索的风雨振模型,并结合目前对于水线与拉索表面之间相互作用力研究的新进展对拉索风雨振展开了时域频域分析,并对拉索与水线多项参数的影响展开研究.计算结果表明,拉索发生风雨振时主要以拉索固有频率振动,水线振动频率以拉索频率为主同时夹杂其倍频成分;阻尼比和单位长度拉索质量的增大能有效抑制拉索振幅;根据Prandtl边界层理论确定的黏滞线性阻尼系数的增大或减小均会带来拉索振幅的减小;水线表面圆弧直径的增加对振动略有抑制;随着单位长度水线质量的增加,拉索振幅与风速区间均增大且起振风速也随之提高.Rain-wind induced vibrations can do great harm to stay cables.A rain-wind induced vibration model of stay cables is built by theoretical analysis.Time history analysis,frequency analysis and parameter analysis are carried out based on study on interaction between rivulet and the cable.The results show that cable vibrates at the natural frequency.Rivulet vibrates at the natural frequency of cable mostly and vibrates at the multiple frequency slightly.Damping ratio and the mass per unit length of cable can effectively mitigate the amplitude of cable.The amplitude of cable can be mitigated as the change of linear viscous damping coefficient calculated by the Prandtl Theory.The amplitude of cable can be reduced slightly as the diameter of rivulet increases.The amplitude of cable and wind velocity of vibration will increase as the mass per unit length of rivulet increases.

关 键 词：斜拉索 风雨振 响应分析 影响参数 

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]