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为研究斜拉索风雨激振的发生机理,该文对带固定水线的斜拉索二维模型进行CFD数值模拟,得到了气动力系数随上水线位置变化的曲线,并分析了上水线对拉索气动特性的影响。将CFD计算得到的气动力系数曲线代入风雨激振二维两自由度模型中进行数值求解,实现了对风雨激振现象的完全数值模拟。然后对比风雨激振人工模拟降雨风洞试验测得的结果,分析了平均风速和脉动风速的影响。研究表明,上水线的振荡是诱发风雨激振的主要原因,且考虑风速脉动后的斜拉索振动及水线振荡更接近试验结果。
In order to study the mechanism of wind-rain vibration of stayed cables, CFD numerical simulation of two-dimensional model of stay cables with fixed water lines was carried out. The curves of the aerodynamic coefficients with the location of the waterline were obtained. Effect of wire on the aerodynamic characteristics of cables. The aerodynamic coefficient curve calculated by CFD is substituted into the model of two-dimensional wind and rain vibration to solve the problem numerically, and the numerical simulation of wind and rain excitation is completed. Then, compared with the result of wind-rain simulated artificial rainfall wind tunnel test, the influence of average wind speed and fluctuating wind speed is analyzed. The research shows that the oscillation of Sheung Shui line is the main reason of induced wind and rain vibration, and the vibration of the stay cable and water line oscillation after the wind speed pulsation are more close to the experimental results.