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风雨激振是斜拉索发生大幅振动的情况中较为典型的现象。水线运动规律及其受力情况的分析是建立风雨激振理论模型的难点之一。该文分别采用假定水线按正弦规律运动和进行受力分析建立水线运动方程两种模型与建立的拉索三维连续体模型进行联立,采用数值方法进行对比研究,得到了拉索和水线的运动规律,验证了二阶振动模态的影响可忽略的假设的合理性,讨论了水线振动幅度对拉索振幅的影响,发现拉索的振动幅值与水线的振动幅值正相关,考察了水线振动频率与相关参数(单位长度水线质量、风速等)的关系,研究了水线与拉索的振动相位关系,得到了较为合理的风雨激振现象的机理解释。
Wind and rain excitations are the typical phenomenon in the case of large vibration of stay cables. The analysis of the law of waterline movement and its force situation is one of the difficulties in establishing the wind-rain excitation theory model. In this paper, the two models of waterline motion equation and the three-dimensional continuum model of cable were established by assuming that the waterline was in sinusoidal motion and stress analysis. The numerical method was used to make a comparative study. This paper verifies the rationality of the hypothesis that the second-order vibration mode has negligible influence. The influence of the vibration amplitude of the water line on the cable amplitude is discussed. The vibration amplitude of the cable and the vibration amplitude of the waterline are positive The relationship between waterline vibration frequency and relevant parameters (waterline quality per unit length, wind speed, etc.) Was investigated. The vibration phase relationship between waterline and cable was studied, and a more reasonable explanation of mechanism of wind - rain vibration was obtained.