【摘要】 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。更多还原

【Abstract】 The rain-wind induced vibration(RWIV) of cables in cable stayed bridges is the typical phenomenon.The most difficult problem of establish the model of the RWIV is the analysis and hypothesis of the rivulet’s stress and characteristics of motion.In this paper,the comparative study of RWIV will be proceeding.Aiming at the problem of the model of the rivulet,a kind of the sine function is accepted,and another kind of the rivulet model is established on the basis of analysis on the stress of the rivulet.Then,solve the equations of cable and the rivulet jointly by numerical method,get the characteristics of motion of the cable and rivulet,then verify the rationality of ignoring the influence of the second model of a cable and discuss the impact to the amplitude of a cable caused by vibration amplitude of rivulet,the larger amplitude of the rivulet,the larger amplitude of the cable,then investigate the factors like the mass of per unit length rivulet and the mean wind speed which is related with the frequency of a rivulet.Finally,the phase relationship between a rivulet and a cable is researched and draw some more rational explanations of the RWIV phenomenon.更多还原