This article investigates the vertical vortex-induced vibration of a flat-closed-box girder using numerical simulation method. The accuracy of simulation results is verified at first by comparing the displacement responses and vortex-induced force of vertical vortex-induced vibration with those obtained in a previous wind tunnel test of large-scale sectional model. The precision of extracting the vortex-induced pressures from the surface pressures and decomposing the vortex-induced pressures via the mathematical model is validated later. Subsequently, the vortex-induced pressures and energy distribution, and the evolution laws of vortex-induced pressures and energy are discussed. The results show that the linear aerodynamic negative damping and nonlinear aerodynamic positive damping are key factors of the rapid development of vortex-induced vibration and the self-limiting phenomenon separately. The positive aerodynamic damping is mainly provided by the lower surface and the middle of the upper surface, and the negative aerodynamic damping is primarily provided by the middle and downstream of the upper surface.

中文翻译：

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基于数值模拟的扁平封闭箱梁分布涡激压力和能量演化规律

本文采用数值模拟方法研究了平封闭箱梁的垂直涡激振动。首先通过将垂直涡激振动的位移响应和涡激力与以往大型截面模型风洞试验中获得的位移响应和涡激力进行比较，验证了仿真结果的准确性。从表面压力中提取涡激压力并通过数学模型分解涡激压力的精度在后面得到验证。随后，讨论了涡激压力和能量分布，以及涡激压力和能量的演化规律。结果表明，线性气动负阻尼和非线性气动正阻尼分别是涡激振动和自限现象快速发展的关键因素。正气动阻尼主要由下表面和上表面中部提供，负气动阻尼主要由上表面中部和下游提供。