斜拉人行桥多维脉动风荷载模拟研究

Simulation on the Multi-dimensional Pulse Wind Loading of a Large Span Cable-stayed Pedestrian Bridge

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 simulation on the multi-dimensional pulse wind loading of a large span cable-stayed pedestrian bridge was actively carried out in this paper. The auto-spectrum and cross-spectrum expression for the wind loading of bridges were established based on the multi-variable stochastic process. The coupling wind effects of tower, cable and deck were taken into consideration by using coherence function. The Fourier Transform was utilized to reduce the computation ex- pense of the wind simulation. A real large span cable-stayed pedestrian bridge in Wuhan was taken as an example to ex- amine the possibility and feasibility of the proposed approach. The properties of the simulated pulse wind loading were in- vestigated and compared with the theoretical expression.