安装景观灯具四索股吊索风致振动响应与控制OA

To study the wake-induced vibration caused by installing lighting fixtures on the multi-cable wire rope hangers of a long-span suspension bridge,taking the structural parameters of the four-cable wire rope hangers of Guangzhou Wanlong Bridge as the engineering background,a series of comprehensive wind tunnel tests were conducted through segmental models and three-dimensional aeroelastic models.First,a rigid segment model considering the lay length and lay angle was designed and manufactured to obtain the changes in the drag and lift coefficients of the cable with wind yaw angle(0°～360° at 3° intervals).Furthermore,computational fluid dynamics(CFD)numerical simulations were carried out and compared with the experimental results.Subsequently,a three-dimensional aeroelastic model based on actual wire rope material was manufactured,detailed wind tunnel tests were conducted focusing on yaw angle and wind speed,and additional tests with one and three spacers were conducted under the most unfavorable yaw angle.The results show that after the lighting fixtures are installed on the four-cable wire rope hangers of the Wanlong Bridge,the wake-induced vibration phenomenon is significant.The most unfavorable wind yaw angle is 120°,and the spacers exhibit a good suppression effect on the wake-induced vibration.