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现代大跨桥梁跨度更大、结构更轻柔、自振频率较低且密集,在较低风速下主梁易发生涡激振动现象。涡激振动是一种带有自激、自限特性的非线性振动,影响涡激振动响应的因素较多如雷诺数效应、紊流特性及主梁断面形式等。介绍了近期大跨度桥梁主梁涡激振动影响因素的研究进展,为抗风设计及抑振措施提供参考。
The span of modern large-span bridges is larger, the structure is more gentle, the natural frequency is lower and dense, and the vortex vibration is easy to occur in the main girder at lower wind speed. Vortex-induced vibration is a kind of non-linear vibration with self-excitation and self-limiting characteristics. There are many factors that affect the vortex-induced vibration response, such as the Reynolds number effect, turbulence characteristics and the cross-section of the main beam. The research progress on the influence factors of vortex-induced vibration of long-span bridges is introduced in this paper, which provides reference for wind-resistant design and vibration-suppression measures.