带有纵向肋条斜拉索的风雨激振减振机理研究  

MECHANISM STUDY OF VIBRATION REDUCTION FOR RAIN-WIND INDUCED VIBRATION OF STAY CABLE WITH RIBS

作　　者：毕继红[1,2] 乔浩玥[1] 关健[1] 王剑 BI Ji-hong;QIAO Hao-yue;GUAN Jian;WANG Jian(School of Civil Engineering,Tianjin University,Tianjin 300350,China;Key Laboratory of Coast Civil Structure Safety,Ministry of Education,Tianjin 300072,China;School of Civil Engineering,Tianjin Chengjian University,Tianjin 300384,China;Key Laboratory of Soft Soil Characteristic and Engineering Environment of Tianjin,Tianjin 300384,China)

机构地区：[1]天津大学建筑工程学院,天津300350 [2]滨海土木工程结构与安全教育部重点实验室,天津300072 [3]天津城建大学土木工程学院,天津300384 [4]天津软土特性与工程环境重点实验室,天津300384

出　　处：《工程力学》2018年第4期168-175,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(51408399);天津市应用基础与前沿技术研究计划项目(15JCYBJC48800;17JCYBJC22300);道路结构与材料交通行业重点实验室基金项目(310821171114);天津市企业博士后创新项目择优资助计划项目(2015-003);天津城建大学科技成果转化奖励资助项目(KJZH-CA3-1744;KJZH-CB8-1724)

摘　　要：基于滑移理论,推导耦合的水膜运动方程和斜拉索运动方程,得到了可用于分析任意横断面外形斜拉索的风雨激振理论模型;并建立带有两个纵向肋条的斜拉索外形,通过对方程组进行求解分析水膜形态、斜拉索升力及斜拉索振动响应之间的相互联系,探究其减振机理。结果表明:带有两个肋条的斜拉索虽不能抑制上水线的形成,但与圆形横断面斜拉索的相比,使上水线厚度变薄,并且阻碍水线沿斜拉索表面的周期性滑落,扰乱其与斜拉索振动的频率相关性,使得斜拉索升力周期性特性减弱,从而抑制斜拉索在横风向的大幅度振动,阻碍风雨激振现象的产生。Based on lubrication theory,2D coupled equations of water film evolution and cable vibration are derived.This numerical model could be used to describe cables with an arbitrary 2D shape subjected to wind and rain.Cables with two ribs are analyzed by numerically solving the coupled equations.The vibration characteristics of cables,rivulets and aerodynamic lift are analyzed to investigate a possible vibration control mechanism of changing the surface shape of cables.The results show that although stay cables with two ribs cannot hinder the formation of upper rivulet compared with the case of circular cables,they could reduce the thickness of upper rivulet and impede the upper rivulet sliding around the cable periodically.Thus the frequency correlation between the water film and cable is disturbed,and the periodicity of aerodynamic lift is weakened.Therefore the large amplitude of cable vibration is suppressed and the resonance between the water film and cable does not occur.

关 键 词：风雨激振 减振 滑移理论 空气动力学措施 纵向肋条 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]