毕继红^1,2, 关健¹, 王剑³, 武骥¹
AuthorsHTML:毕继红^1,2, 关健¹, 王剑³, 武骥¹
AuthorsListE:Bi Jihong^1,2, Guan Jian¹, Wang Jian³, Wu Ji¹
AuthorsHTMLE:Bi Jihong^1,2, Guan Jian¹, Wang Jian³, Wu Ji¹
Unit:1. 天津大学建筑工程学院，天津 300072；2. 滨海土木工程结构与安全教育部重点实验室(天津大学)，天津 300072；3. 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
Unit_EngLish:1．School of Civil Engineering, Tianjin University, Tianjin 300072, China
2．Key Laboratory of Coast Civil Structure Safety (Tianjin University), Ministry of Education, Tianjin 300072, China
3．Key Laboratory of Soft Soil Characteristic and Engineering Environment of Tianjin, Tianjin Chengjian University, Tianjin 300384, China
Abstract_Chinese:风雨激振涉及到气、液、固3种相态的相互耦合作用, 在数值模拟方面存在困难．在水膜形态与拉索振动双向耦合方程的基础上, 应用有限差分法求解; 在保证精度的前提下, 提高增量步长, 大幅减少计算时间; 应用有限元软件COMSOL求解随时间变化的风压力系数和风摩擦力系数; 分别研究了特定风速下的拉索振动响应、拉索升力以及水膜形态变化, 并分析了三者之间的关系, 以揭示风雨激振的产生机理．获得了基于双向耦合方程的拉索振动持续140 s的数值模拟结果．结果表明：拉索表面水膜形态的周期性变化导致拉索升力的周期性变化, 从而引起拉索的大幅度振动; 水线与拉索间的共振是产生风雨激振现象的主要原因．
Abstract_English:Rain-wind induced vibration(RWIV)involves the interaction of three kinds of phase，which are gas，liquid and solid，so it is difficult to be simulated numerically. Based on the two-way coupling equations of water film evolution and cable vibration，this paper proposed the finite difference method for solving the coupled equations. The computational time step was substantially increased by this method，thus the computation time was greatly reduced，while the computation accuracy was ensured. The transient wind pressure and friction coefficients were obtained by using the professional finite element analysis software COMSOL multiphysics. The calculation results of rivulets，aerodynamic lift and vibration of cable were obtained at the special wind speed. The relationships among them were analyzed to reveal the mechanism of RWIV，and the numerical results of 140 s based on the two-way coupled equations were obtained. The results demonstrate that the cyclical changes of water film morphology on the cable surface lead to the cyclical changes of cable lift，which is the reason why the cable vibrates with large amplitude under the special conditions of wind and rain. This confirms the conclusion that the main reason for RWIV is the resonance between rivulets and a cable.
Keyword_Chinese:风雨激振; 斜拉索; 水膜; 共振; 有限单元法; 有限差分法
Keywords_English:rain-wind induced vibration; stay cable; water film; resonance; finite element method; finite difference method

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