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涡激力半经验模型基于试验结果,描述涡激振动响应特征,属于现象学范畴。目前工程应用较多的主要有经验线性模型、Scanlan非线性模型和Larsen广义模型。常规尺度(1∶60左右)节段模型较小,受雷诺数效应及模型细节处理不够精确等因素影响,试验结果与实际结构往往会存在一定差异。大尺度主梁节段模型(通常为1∶15～1∶20)试验雷诺数更接近实桥,更精确地模拟主梁细节,可测得更精细准确的涡振振幅和涡振区。通过一大跨度悬索桥扁平箱梁1∶20大尺度节段模型涡振试验,基于经验线性模型、Scanlan非线性模型和Larsen广义模型识别涡激力。分析三种半经验模型在描述涡激力和涡振响应方面的特点,为类似工程应用提供参考依据。最后根据沿跨向涡激振动研究进展,提出了三维涡激振动研究问题。
Based on the experimental results, the semi-empirical model of vortex-induced vibration describes the characteristics of vortex-induced vibration and belongs to the category of phenomenology. At present, there are mainly more experienced engineering linear model, Scanlan nonlinear model and Larsen generalized model. At the conventional scale (about 1:60), the segment model is small, which is influenced by the Reynolds number effect and the inaccurately processing of the model details, and there are often some differences between the test results and the actual structure. Large-scale girder segment model (usually 1:15 ~ 1:20) The experimental Reynolds number closer to the real bridge, more accurately simulate the details of the main beam can be measured more precise and accurate vortex amplitude and vortex vibration area. The vortex-induced vibration of a long-span suspension box girder with a 1:20 large-scale segment model is identified based on the empirical linear model, the Scanlan nonlinear model and the Larsen generalized model. The characteristics of three kinds of semi-empirical models in describing the vortex-induced vibration and the vortex-induced response are analyzed, which can provide references for similar engineering applications. Finally, based on the research progress of the vortex-induced vibration in the cross direction, the issue of the three-dimensional vortex-induced vibration is proposed.