安装亮化灯具导致的斜拉桥拉索风致驰振流固耦合分析

为了提出一种流固耦合分析方法用以模拟和分析风致振动现象,通过将拉索-亮化灯具系统的流场简化为相对来流有一定攻角的三圆柱串列模型,将系统振动模型简化为质量-弹簧-阻尼系统,采用SST湍流模型,结合特别设计的网格划分技术,应用ANSYS CFX软件及User Fortran工具自行开发结构动力分析程序,对特征长度相差较大的三圆柱系统之间气动干扰现象进行精确模拟。结果表明：提出的流固耦合分析结果成功再现了风洞试验现象;在风速大于18m.s-1时,下游钢丝绳受到的流体作用变得明显,体现出其改变拉索-灯具系统截面形式的作用,从而在机理上较好地解释驰振力的形成过程,验证了该方法的正确性,并可供类似研究参考。

Fluid-structure Interaction Analysis of Wind-induced Galloping of Cables with Lamps of Cable-stayed Bridge

A new method of simulating the interaction between fluid and structure was explored to analyze this wind-induced vibration phenomenon.System of cable with lamps was simplified as a serial model of three cylinders with attack angle to the inlet flow,and vibration system of cable was simplified as mass-spring-damping system.Combined with the special mesh partition technology,using ANSYS CFX software and User Fortran module,the structural dynamic analysis program was developed,three cylinders system with larger difference in characteristic length was accurately simulated by using the shear stress transport turbulence model.The flow distribution of the whole domain was calculated.Results show that the phenomenon of all the wind tunnel test results is reproduced.When wind velocity is bigger than 18 m·s-1,fluid action of downstream steel wire is obvious.It presents the action of changing sectional shape of system of cable with lamps so that forming process of galloping is explained well from point of view of mechanism.The correctness of the method presented in this paper is proved,and the method can be consulted in the similar research.