斜拉桥拉索风雨激振理论模型和机理研究

斜拉桥拉索风雨激振的机理研究是国际风工程和桥梁工程领域的著名难题。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,拉索和水线模型上的平均风压和脉动风压系数,以及气动力系数。在此基础上,建立了拉索风雨激振新的理论模型,计算分析了节段三维拉索的风雨激振响应及其机制。

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

Rain-wind induced vibration of cables of cable-stayed bridges is a problem of great concern in communities of wind engineering and bridge engineering. 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 angle and wind angle.Mean and fluctuating pressures and aerodynamic force coefficients of the cable model and the artificial rivulet under the conditions of typical cable inclined angles and wind angles are obtained.On the basis of the test results,a new theoretical model for describing rain-wind induced vibration of stayed cables is established,with which the rain-wind induced responses a typical cable model are computed and the mechanism is analyzed.