水线震荡对斜拉桥拉索风雨激振稳定性的作用

从理论和试验两个方面研究了水线震荡对斜拉桥拉索风雨激振稳定性的作用。建立了拉索和水线的运动方程，应用李雅普诺夫函数给出了水线不平衡角的判别公式。设计了一种新型的带有可运动人工水线的拉索模型，并进行了风洞试验。理论和试验结果表明，水线震荡是导致拉索风雨激振具有较大不稳定范围的主要原因。试验结果证明了理论模型和分析的结果是正确的。

Effects of Motion of Rivulet on Stability of Rain-Wind Induced Vibration of Cables of Cable-Stayed Bridges

Effects of motion of the upper rivulet on stability of rain-wind induced vibration of cables of cable-stayed bridges are theoretically and experimentally studied in this paper. Equations governing the motions of the rivulet and cable are firstly established, and the criterion formula for motion unstability of the cable is derived in accordance with Lyapnov stability criterion. A new cable model system with a movable artificial rivulet is designed and tested in a wind tunnel. The theoretical and experimental results match well and both of them indicate that the motion of the rivulet is the key reason for the motion unstability of the cable.