【摘要】 根据大型斜拉桥圆柱型桥塔的结构特点,确定其主要动力特性是发生涡激振动.通过合理简化建立桥塔计算模型及其涡激振动方程,利用振型叠加原理求解振动微分方程,确定桥塔风致涡激共振时的稳态振动响应;由风致涡激振动理论及有关空气动力学原理确定漩涡发放频率以及升力幅值;考虑桥塔的形状结构特点以及发生共振时的频率锁定现象确定锁定区域,理论分析和数值计算结果表明:幅频响应曲线的共振峰所占频域极窄,在百年一遇的风载荷作用下桥塔在发生风致涡激共振的情况下其响应幅值不大,结构处于安全的状态.更多还原

【Abstract】 It is determined that the dynamic characteristic of the cylindrical-typed bridge tower of the large cable-stayed bridge is that vortex-induced vibration occurred with its structural features.The Bridge tower calculation model is established with reasonable simplification; vibration equation is also established with the model;and the steady response of vortex-induced resonance of the cylindrical-typed bridge tower is obtained with mode superposition principle.The vortex-induced vibration theory and the principles of aerodynamics are used to determine the frequency of the vortex and lift amplitude. Characteristics of shape structure of bridge towers and the resonant frequency locking phenomenon are considered in determining the locking region.Theoretical analysis and numerical calculation show that the response of bridge towers is not a big value when vortex-induced vibration happening; the peak value of amplitude-frequency response curve is in a very narrow domain.when vortex-induced resonance of bridge towers under 100-year wind load happening the amplitude of response is little, enabling the structure to be in a safe condition.更多还原