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为了研究特征紊流抖振力对大跨度桥梁静风稳定性的影响,提出了特征紊流气动力模型,建立了考虑特征紊流影响的大跨度桥梁静风稳定分析方法。通过采用风洞实测气动力系数谱模拟特征紊流气动力系数时程,利用动力有限元算法计算了西堠门大桥的位移响应,分析了特征紊流对其静风稳定的影响。结果表明:结构仅仅是在平衡位置附近作微幅振动,特征紊流对西堠门大桥静风稳定临界风速和失稳形态没有明显影响。主要是因为特征紊流是窄带的随机过程,其能量主要集中在某一个频率附近,对西堠门大桥而言,该频率远高于结构的基频,所以特征紊流气动力未能激起较大的位移响应。
In order to study the effect of characteristic chattering force on the static wind stability of long-span bridges, the aerodynamic model of characteristic turbulence is proposed and the static wind stability analysis method of long-span bridges considering characteristics turbulence is established. By using the aerodynamic coefficient spectrum of the wind tunnel to simulate the characteristic turbulence aerodynamic coefficient time series, the displacement response of Xichangmen Bridge was calculated by dynamic finite element method, and the influence of characteristic turbulence on the stability of the static wind was analyzed. The results show that the structure is only slightly vibrated near the equilibrium position, and the characteristic turbulence has no obvious influence on the critical wind speed and instability of the static wind of Xizhimen Bridge. The main reason is that the characteristic turbulence is a narrow-band random process and its energy is mainly concentrated near a certain frequency. For Xi’ao Gate Bridge, the frequency is much higher than the fundamental frequency of the structure, so the characteristic turbulence aerodynamics fails to stir up Large displacement response.