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该文在已有理论的基础上,提出了一种新的拉索风雨激振的理论解释,并针对拉索的风雨激振提出了一种新型的减振装置——限位装置。运用解析法和数值法模拟了拉索的风雨激振现象,所得结果与以往研究者得到的解析结果及试验现象相一致。在此基础上,运用有限元方法模拟了限位装置,研究了其对拉索风雨激振的抑制作用。从能量原理和致振机理两个角度,阐明了限位装置的减振机理。讨论了间隙和限位位置对减振效果的影响。结果表明:斜拉索发生风雨激振时,可以将风雨对拉索的作用简化为上水线绕拉索周向振动时,作用在拉索上的离心力,以此解释风雨激振的机理;限位装置能显著减小拉索风雨激振的振幅;限位装置减振机理明确,能够从根本上抑制风雨激振的发生;减小间隙或将限位位置向拉索中间靠拢,会使减振效果更加明显。
Based on the existing theory, this paper presents a new theoretical explanation of the wind and rain excitation of the cable, and puts forward a new type of damping device - the limit device for the wind and rain excitation of the cable. The wind and rain excitation of the cable is simulated by analytic method and numerical method. The obtained results are consistent with the analytical results and experimental phenomena obtained by previous researchers. On this basis, the finite element method was used to simulate the limit device, and its restraining effect on the wind and rain vibration of the cable was studied. From the energy principle and mechanism of vibration, the mechanism of vibration limiting device is expounded. The effect of gap and limit position on the vibration damping effect is discussed. The results show that the mechanism of wind and rain excitation can be explained by the fact that the effect of wind and rain on the cable can be simplified to the centrifugal force acting on the cable when the cable is vibrating circumferentially around the cable. The limiting device can significantly reduce the amplitude of the wind-rain excitation of the cable; the mechanism of the limiting device has a clear vibration damping mechanism which can fundamentally suppress the occurrence of the wind-rain excitation; reduce the gap or move the limiting position closer to the middle of the cable, Vibration damping effect is more obvious.