Abstract:Dry cable galloping is a new vibration type of stay cables which was found in recent years. It has become an important factor that should be considered in bridge design because of large amplitude and serious demage. Three different surface roughness cable models were investigated by high frequency balance technique and displacement meter in wind tunnel. Based on analyzing on drag forces, lift forces and vibration amplitudes under different Reynolds number, it is found that asymmetric and unstable flow field appears under critical Reynolds number; cable balance position are changed and large amplitude vibration are induced due to unstable lift forces in the flow field. Critical Reynolds number decrease with the increase of surface roughness. For prototype cables with smooth surface, as wind velocity corresponding to critical Reynolds number is rather high, the possibility of large amplitude vibration induced by forces of citical Reynolds number is small. However, cables surface will becomes rough under environment such as sunshine, wind, rainfall, floating dust adherence, thus large amplitude vibration becomes possible under common high wind velocity. This is one of the possible mechanisms of dry cable galloping for prototype cables.
刘庆宽;张峰;马文勇;王毅 . 斜拉索雷诺数效应与风致振动的试验研究[J]. , 2011, 30(12): 114-119.
Liu Qing-kuan;Zhang Feng;Ma Wen-yong;Wang Yi . Experimental study on reynolds number effect and wind-induced vibration of stay cables. , 2011, 30(12): 114-119.