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研究了大跨轻柔斜拉人行桥多维脉动风荷载模拟问题。首先基于多变量随机过程理论建立了桥梁结构风荷载模型的互谱和自谱表达式,进一步地基于相干函数考虑了塔-索-桥的风荷载相关效应。通过引入Fourier变换减小了随机过程模拟的计算量。在此基础上,以某实际的大跨度轻柔斜拉人行桥为工程背景,研究了其考虑塔-索-桥相关性的多维脉动风荷载特点和规律,并对模拟结果进行了验证和对比研究。
The multi-dimensional fluctuating wind load simulation of long-span and light-inclined footbridge is studied. Firstly, based on multivariate stochastic process theory, the cross spectrum and auto-spectrum expression of wind load model of bridge structure are established, and the wind-load correlation effect of tower-cable-bridge is further considered based on the coherence function. By introducing Fourier transform, the computational complexity of stochastic process simulation is reduced. On the basis of this, taking a practical long-span cable-stayed bridge as a background, the characteristics and rules of multi-dimensional fluctuating wind loads considering the tower-cable-bridge correlation are studied. The simulation results are verified and compared .