Features of wind dynamic effects of a hyperboloidal cooling tower and the influence factors
ZHANG Junfeng1, 2, YANG Junhui1 ,GE Yaojun2, ZHAO Lin2
1. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China;
2. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
For further interpretation of the features of wind dynamic effects on hyperbolic cooling towers (HCTs), the dynamic responses were calculated and the features were analyzed.The analysis focused on the background component σ_B and resonance components σ_R, and their contributions to the total gust response σ.Then, the parameters of damping ratio ζ, velocity V and meridian correlation coefficient ρ were altered respectively to study their influences on the gust responses and the influence mechanism.It is shown that the coupling effects of σ_ and σ_R could be neglected for all responses.The contribution of σ_R to σ varies with responses and locations.If σ_R is neglected, the σ of F_X and F_Y decrease about 10% in the middle and bottom shell but about 20% in the top shell, and the σ of M_X decreases about 20%-30% for the whole shell height.With the increase of ζ, the σ_R of all responses decreases remarkably and the decrease amount could be determined roughly by a simple equation.However, the decrease of σ is slight because the contribution of σ_R to σ is limited, especially for F_X and F_Y.It is also found that σ_R is proportion to V3.The meridian correlation influences σ_B directly and then σ indirectly, so this influence is mainly on the σ_B of F_X and F_Y, which is predominant in σ.Nonetheless, σ_B of F_Y increases with the coefficient ρ, but σ_B of F_X decreases.Finally, in structural reinforcement designs, the resonance effects of meridian internal forces could be neglected and that of latitude internal forces couldn’t be neglected.
收稿日期: 2017-05-03
出版日期: 2018-09-15
引用本文:
张军锋1, 2，杨军辉1，葛耀君2，赵林2. 冷却塔风振效应特征及影响因素分析[J]. 振动与冲击, 2018, 37(18): 201-208.
ZHANG Junfeng1, 2, YANG Junhui1,GE Yaojun2, ZHAO Lin2. Features of wind dynamic effects of a hyperboloidal cooling tower and the influence factors. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(18): 201-208.
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