一维钝体竖向拍振非线性涡激力识别

基于Scanlan经验非线性模型,推导一维钝体竖向涡激振动拍振响应.借鉴Wilkinson涡激力相关性函数,探讨节段模型拍振状态下气动参数、涡激力识别方法,分析相关性对涡激力识别的作用.以一大跨度桥梁主梁断面为例,识别气动参数及其非线性涡激力,结果表明在节段模型试验分析中考虑相关性作用后,可更准确地识别其非线性涡激力.

Nonlinear vortex-induced force identification on beat state of 1-D bluff body vertical vortex-induced vibration

The vertical beat response of 1-d bluff body can be expressed by Scanlan's nonlinear empirical model. Then, the way is discussed to identify aerodynamic parameters and vortex-induced force on beat state. Particularly, the Wilkinson's correlation function is used here to analyze its effect on vortex-induced force identification of section model. Lastly, the aerodynamic parameters and nonlinear vortex-shedding force are identified by taking a long-span bridge girder section model wind tunnel test as an example. And it shows that the nonlinear vortex-induced force can be identified more precisely after taking into account the effect of correlation function.