横风向旋涡脱落的共振分析及在工程上的应用

The analysis on vortex shedding resonance of across-wind and application to the practical engineering

结构在风荷载作用下,不但会出现顺风向平均风响应和脉动风引起的风振响应,而且必然同时出现横风向旋涡脱落风振,当横风向旋涡脱落频率与结构的某阶自振频率一致时,结构会产生极大的横风向共振,以致引起结构的损坏或破坏。在阐述横风向旋涡脱落频率共振的基本原理基础上,结合工程实际,对某一电信楼的避雷针结构进行了横风向风振(旋涡脱落)的校核与计算,得到了一些有益的结论与建议,为避雷针的进行风振控制提供了可靠的参考依据。

Under wind action, structural vibration occurs not only along wind direction but also across wind direction. In case the vortex shedding frequency is about equal to vibration frequency the structure, extreme vibration of structure occurs, which is very dangerous to the structural safety. Based on the basic principle of the vortex shedding resonance across-wind, the across-wind vortex shedding of a lightening rod of telecommunication building is calculated. Some useful conclusions are obtained, and some reliable references can be offered to the wind vibration control for the kind of the structure.