风雨激振中斜拉索表面水线运动的三维数值模拟  

Three-dimensional numerical simulation on rivulet movement of rain-wind induced vibration of stay cable

作　　者：王剑[1] 毕继红[2] 关健[2] 乔浩玥[2] 邵倩 周燕[1] 管青海 WANG Jian;BI Ji-hong;GUAN Jian;QIAO Hao-yue;SHAO Qian;ZHOU Yan;GUAN Qing-hai(Key Laboratory of Soft Soil Characteristic and Engineering Environment of Tianjin,Tianjin Chengjian University,Tianjin 300384,China;School of Civil Engineering,Tianjin University,Tianjin 300072,China;Flender Drive System Co.Ltd.,Tianjin 300400,China)

机构地区：[1]天津城建大学天津市土木建筑结构防护与加固重点实验室,天津300384 [2]天津大学建筑工程学院,天津300072 [3]弗兰德传动系统有限公司,天津300400

出　　处：《振动工程学报》2020年第3期559-569,共11页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51408399);天津市自然科学基金资助项目(15JCYBJC48800,17JCYBJC22300,18JCQNJC08300,18JCYBJC90800);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(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);基于“互联网+微课”的桥梁工程课程教学改革与实践(JGYBZ-1924)。

摘　　要：基于滑移理论推导三维水膜运动方程,重点考虑斜拉索表面水膜形态变化对风压力系数和风摩擦力系数的影响,建立模拟风雨条件下三维节段斜拉索表面水膜形态变化的理论模型。在此基础上推导出三维节段斜拉索气动力的计算公式,研究水线运动对拉索气动力及其振动响应的影响。结果表明:应用三维滑移理论模型数值模拟得到的拉索表面上下水线的位置、形态与风洞试验结果相近;发生风雨激振时斜拉索的顺风向振幅明显小于横风向振幅;水线沿拉索环向与轴向运动使得水膜形态发生低频周期性变化,导致拉索气动升力与阻力的同频周期性变化,从而引起拉索的大幅度振动,产生风雨激振现象。Mainly considering the effects of water film evolution on wind pressure coefficient and friction coefficient,a three-dimensional model for simulating the water film evolution around rigid cable under rain-wind induced vibration(RWIV)is built based on lubrication theory in this paper.On this basis,the formulas for aerodynamic forces of stay cable are derived from water-film motion equation,which is used for investigating the influences of rivulet movement on aerodynamic forces and vibrations of the cable.The results show that the morphology and positions of upper and lower rivulets that simulated by three-dimensional model are all close to wind tunnel test results.The along-wind vibration amplitude of cable is significantly less than across-wind vibration amplitude when RWIV occurs.The morphology of water film periodically variations in low frequency induces the periodical movements of rivulets in ring direction and axial direction,which leads to the periodically changes of cable lift and drag with same frequencies and causes the large amplitude vibrations of cable.

关 键 词：风雨激振 斜拉索 三维模型 滑移理论 水线 

分 类 号：TU312.1[建筑科学—结构工程] U443.38[建筑科学—桥梁与隧道工程]