摘要
结合谐波合成法对大跨斜拉桥的随机风场进行了数值模拟,模拟时考虑桥梁风场空间相关性的影响,并对模拟时的参数进行讨论。研究表明:在不考虑高度的情况下,采用Davenport谱对模拟结果更好;竖向风谱对平均风速与空间高度较敏感,在选取截断频率时应适当大一些。最后,依据工程实例模拟了某大跨斜拉桥的随机风场,对模拟的脉动风功率谱与目标谱进行比较,结果表明二者吻合较好,证明了参数取值的合理性和模拟结果的准确性。
The stochastic wind field of large span cable-stayed bridges was simulated using the method of harmonic synthesis while considering the spatial correlation of the bridge wind field, and the parameters of the simulation were discussed. The results show that the Davenport spectrum of simulation yields better results without considering the height; the vertical velocity spectrum is highly sensitive to the average wind speed and spatial height; the cut off frequency should be higher. The stochastic wind field of a large span cable-stayed bridge was simulated based on practical application. The comparison between the simulated fluctuating wind power spectrum and the target spectrum was conducted. The results show that the spectra basically coincide, and the validity of the parameters is also proved.
出处
《筑路机械与施工机械化》
北大核心
2015年第12期77-79,83,共4页
Road Machinery & Construction Mechanization
基金
浙江省交通运输厅科研计划项目(2015J19)
关键词
谐波合成法
大跨斜拉桥
脉动速度
截断频率
harmonic synthesis method
large span cable-stayed bridge
fluctuating velocity
cut off frequency
