【摘要】 钢烟囱作为圆截面高耸结构的形式之一,有着高度高,横截面积小的特点,风荷载是其控制荷载,在产生顺风向响应的同时横风向也会产生很大的动力作用,比较典型的是发生横风共振现象,其对结构带来的影响是不可忽视的。根据高耸薄壁钢烟囱的特点,采用有限元软件ADINA,通过对结构进行动力时程响应分析及圆柱绕流分析,提出一种可调节活动式破风圈,从而减小风致响应,计算了有无该措施结构的动力响应,并将两种结果进行对比研究。结果表明:安装该种减振措施后结构的动力响应有一定程度降低,减振效果明显,且当调节板长度为直径的2倍时,减振效果最佳,可为工程设计提供参考。更多还原

【Abstract】 As one of the high-rise structures with circular cross-section, steel chimney has the characteristics of high height and small cross-sectional area. The wind load is its control load. It produces a downwind response and a great dynamic effect in the crosswind direction, which is more typical. The phenomenon of cross-wind resonance occurs, and its impact on the structure cannot be ignored. Based on the characteristics of the towering thin-walled steel chimney, the finite element software ADINA was adopted, through the dynamic time-history response analysis of the structure and the analysis of the flow around the cylinder, an adjustable movable wind breaker was proposed to reduce the wind-induced response. The dynamic response of the structure of this measure, and the two results were compared. The results show that the dynamic response of the structure is reduced to a certain extent after the installation of this kind of vibration reduction measure, and the vibration reduction effect is obvious, and when the length of the adjusting plate is twice the diameter, the vibration damping effect is the best, which can provide a reference for engineering design.更多还原