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本文研究了桥轴向风的相关性和紊流强度对大跨度桥梁扭转响应稳定性的影响。用一种空气动力系数模式来表示自激力。假定风的紊流是宽带的,时间弱平稳的,随机相关时间远比桥的衰减时间短,那么非耦合扭转响应方程就可以转换成伊滕随机微分方程。用标准的伊滕估算法得到响应的第一和第二阶矩。并以一个特大跨度桥梁作为应用的实例,研究了不同的紊流度和桥轴向风的相关性.对于一定的紊流度来说,减少桥轴向的相关性可提高临界风速,对于一定的桥轴向相关性来说,如果紊流度增大,则临界风速降低.
In this paper, the influence of the axial wind and the turbulence intensity on the torsional response stability of long-span bridges are studied. Use an aerodynamic mode to express self-excitation. Assuming that the turbulence of the wind is broadband and the time is weakly stable, the stochastic correlation time is much shorter than the decay time of the bridge. Then the uncoupled torsion response equation can be transformed into a Itemon stochastic differential equation. The first and second moments of response are obtained using standard Iten’s estimation. A large span bridge is taken as an example to study the correlation between different turbulence degrees and the axial wind of the bridge.For a certain degree of turbulence, reducing the axial correlation of the bridge can increase the critical wind speed, For the axial correlation of the bridge, if the turbulence increases, the critical wind speed decreases.