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为研究风雨共同作用下拉索的气动力特性,以之江大桥为背景,通过对斜拉索的三维刚性节段模型做测力、测压风洞试验,得到4种表面形态下的拉索在不同风向角时的平均和脉动风压系数,结果表明:水线位置强烈影响拉索表面的风压系数分布,靠近水线附近气流的分离点会产生明显的改变,仅当上水线处于某些特定位置时,气动力系数变化明显,拉索才可能发生振动;用测压试验的风压系数积分得到的阻力系数要比测力试验的小10%左右,这是测压试验无法获得气动力中的摩擦分量所导致的。
In order to study the aerodynamic characteristics of cables under wind-rain interaction, taking three-dimensional rigid section model of diagonal cables as test force and pressure wind tunnel test, the cable under four kinds of surface morphologies The results show that the location of waterline strongly influences the wind pressure coefficient distribution on the cable surface, and the separation point near the waterline will produce a significant change. Only when the waterline is in a certain In some specific positions, the aerodynamic coefficient changes obviously, and the cable may vibrate. The resistance coefficient integrated by the air pressure coefficient of the pressure test is about 10% less than that of the force test, which is not obtained by the pressure test The friction component in the power.