缠绕螺旋线的斜拉桥斜拉索平均气动阻力特性的试验研究  

Experimental study on mean drag force coefficients of stay cables with helical lines

作　　者：刘庆宽[1,2] 李聪辉[3] 郑云飞[3] 刘小兵[1,2] 马文勇[1,2] 

机构地区：[1]石家庄铁道大学大型结构健康诊断与控制研究所,河北石家庄050043 [2]河北省大型结构健康诊断与控制重点实验室,河北石家庄050043 [3]石家庄铁道大学,河北石家庄050043

出　　处：《土木工程学报》2017年第5期97-104,共8页China Civil Engineering Journal

基　　金：国家自然科学基金(51378323);河北省杰出青年基金(E2014210138)

摘　　要：通过天平测力风洞试验,在雷诺数为13×104~43×104范围内,对直径为120mm的光滑斜拉索模型和25种螺旋线斜拉索模型进行测力试验,得到了各个工况下阻力系数随雷诺数的变化规律,分析了螺旋线直径、缠绕间距对阻力系数的影响;将气动力系数按照亚临界、临界和超临界雷诺数区域进行分区,得到了各个区域内阻力系数的数值或者拟合公式;结果表明:缠绕螺旋线能减弱雷诺数效应;针对螺旋线直径相同缠绕间距不同的情况,在超临界雷诺数区阻力系数随缠绕间距的增大呈单调减小的趋势;针对缠绕间距相同螺旋线直径不同的情况,在超临界区阻力系数随螺旋线直径的增大呈单调增大的趋势;在具有抑振效果的螺旋线参数组合中,选择使得气动阻力最小的参数,可达到优化设计的目的。The variation laws of drag force coefficients of cable models with the Reynolds number are obtained through a series of high frequency force measurement tests with Reynolds number from 13 ×10^4 to 43 ×10^4. A cable with smooth surface and other 25 cables with varying helical lines are employed to analyze the influence of the diameter and the space of helical lines on the drag force coefficients.＇ The drag coefficients and their fitted curves are classified as the subcritical region, the critical region and the super critical region. The results show that the effect of Reynolds number on drag the force coefficients is weak for the models with the helical lines. With the increase of the space and identical diameter of the helical lines, the drag coefficients decrease in the super critical region. With the increase of the diameter and even space of the helical lines, the drag coefficients show an increasing trend in the super critical region. Based on the results, the optimized arrangement with good wind rain-wind vibration mitigation results of the helical lines can be determined with the minimal drag force coefficients.

关 键 词：斜拉索 阻力系数 螺旋线 风洞试验 参数优化 

分 类 号：TU312[建筑科学—结构工程]