阻尼器对拉索风雨激振的控制效果研究

斜拉桥拉索风雨激振的机理目前还没有定论,人们采取了许多控制风雨激振的措施,在拉索端部安装阻尼器就是最常用的方式之一。在作者建立的三维连续拉索风雨激振理论模型的基础上,建立了阻尼器控制三维连续拉索风雨激振的新理论模型。首先研究了有限差分法中处理阻尼器产生的狄拉克函数的近似方法;然后进行了两端不在同一水平的带阻尼器拉索的自由振动分析;最后,采用准运动水线模型和运动水线模型,研究了阻尼器对拉索风雨激振的控制效果,详细分析了阻尼器空间位置、拉索垂度等对阻尼器控制效果的影响。

THE EFFECTIVENESS OF DAMPERS TO RAIN-WIND INDUCED VIBRATION OF STAY CABLES

The mechanisms of rain-wind induced vibration of stay cables are still not entirely clarified, and many measures have been adopted to control such vibration. Dampers installed at the end of stay cables are one of the most common measures. Based on the analytical models of rain-wind induced vibrations of continuous stay cables established by the authors, an analytical model which studies the effectiveness of dampers to rain-wind induced vibrations is presented. The method to handle the Dirac function in the Finite Difference Method is firstly investigated, and the analysis of free oscillation is carried out. Based on the quasi-moving rivulet model and the real-moving rivulet model, the responses of the cable with dampers are analyzed, and also the influences of the orientation of dampers and the sag of the cable are investigated.