【摘要】 针对斜拉桥拉索的参数振动问题,结合工程实例,采用4种不同的计算公式计算了斜拉索的基频,通过分析比较,推荐采用考虑垂度的常用基频计算公式进行斜拉索的参数共振分析.分析结果表明,黄浦桥的中长斜拉索可能会发生参数共振.采用的黏性剪切型外置式阻尼器可以给斜拉索提供足够的附加阻尼,使拉索各受控振型的对数衰减率均达到0.03以上.更多还原

【Abstract】 Parametric vibration of cables may bring damage to the cable and anchorage,so it must be considered during construction.This paper calculates the basic frequency of cables with four different formulations,and a suitable method is proposed to use in the analyzing of parametric vibration according to the results of calculation.This paper analyses the parametric vibration of Huangpu cable stayed bridge,and the result indicates that for cables not too long or too short,parametric vibration occur more easily.Viscous shear damper,outside set damper,can provide enough damping for the cables,and the logarithmic decrement of controlled mode can be enhanced up to more than 0.03.更多还原