带人工雨线的斜拉桥拉索模型测压试验研究

Testing study on wind pressure distributions of stayed cables with an artificial rivulet

斜拉桥拉索风雨激振是当今国际风工程和桥梁工程研究人员非常关注的问题。为了掌握风雨激振时拉索的气动力特性,研究人员对风向角为0°时带人工雨线的拉索模型进行了测力试验。但至今人们尚未测量过风向角不为0°时带人工雨线的拉索模型上的气动力。本文设计、制作了可方便调节拉索模型倾角和风向角的试验装置以及用于测压试验的带人工雨线的拉索模型,并在风洞中进行了细致的试验。试验得到了具有典型倾角的拉索在不同风向角下,拉索模型上的平均风压和脉动风压系数,以及气动力系数。这些结果为建立精细的理论模型提供了基础。

Rain-wind induced vibration of cables of cable-stayed bridges is a problem of great concerns in communities of wind engineering and bridge engineering. Wind tunnel tests for aerodynamic forces on cables under the condition of 0° wind angle have been performed by researchers, but unfortunately, the aerodynamic forces acting on the cable with an artificial rivulet at non-zero degree wind angles haven＇t yet been measured. In this paper, a cable model with an artificial rivulet is tested with the help of a newly designed test set-up on which the cable model can be easily adjusted to required inclined angles and wind angles. Mean and fluctuating pressures and aerodynamic force coefficients on the cable model and the artificial rivulet are obtained under the conditions of typical cable inclined angles and wind angles. These results might provide a base for establishing more precise theoretical models describing rain-wind induced vibration of stayed cables.