风雨激振时拉索响应、升力及水膜形态研究
发布时间：2019-06-05 10:49
【摘要】：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140s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]:The wind-rain excitation is involved in the mutual coupling of gas, liquid and solid phases, and it is difficult to simulate the numerical simulation. On the basis of the two-way coupling equation of the water film and the cable vibration, the finite difference method is applied to solve the problem, and on the premise of ensuring the accuracy, the increment step size is improved, the calculation time is greatly reduced, and the wind pressure coefficient and the wind friction coefficient with time change are solved by using the finite element software COMSOL; The vibration response of the cable, the lift of the cable and the change of the water film are studied respectively, and the relation among the three is analyzed to reveal the mechanism of the wind and rain excitation. The numerical simulation results of the cable vibration for 140 s based on the two-way coupling equation are obtained. The results show that the periodic variation of the water film morphology of the cable leads to the periodic variation of the lift of the cable, resulting in a large vibration of the cable, and the resonance between the waterline and the cable is the main cause of the wind and rain excitation.
【作者单位】： 天津大学建筑工程学院;滨海土木工程结构与安全教育部重点实验室(天津大学);天津城建大学天津市土木建筑结构防护与加固重点实验室;
【基金】：国家自然科学基金资助项目(51408399)~~
【分类号】：U441.3
[Abstract]:The wind-rain excitation is involved in the mutual coupling of gas, liquid and solid phases, and it is difficult to simulate the numerical simulation. On the basis of the two-way coupling equation of the water film and the cable vibration, the finite difference method is applied to solve the problem, and on the premise of ensuring the accuracy, the increment step size is improved, the calculation time is greatly reduced, and the wind pressure coefficient and the wind friction coefficient with time change are solved by using the finite element software COMSOL; The vibration response of the cable, the lift of the cable and the change of the water film are studied respectively, and the relation among the three is analyzed to reveal the mechanism of the wind and rain excitation. The numerical simulation results of the cable vibration for 140 s based on the two-way coupling equation are obtained. The results show that the periodic variation of the water film morphology of the cable leads to the periodic variation of the lift of the cable, resulting in a large vibration of the cable, and the resonance between the waterline and the cable is the main cause of the wind and rain excitation.
【作者单位】： 天津大学建筑工程学院;滨海土木工程结构与安全教育部重点实验室(天津大学);天津城建大学天津市土木建筑结构防护与加固重点实验室;
【基金】：国家自然科学基金资助项目(51408399)~~
【分类号】：U441.3
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