冷却塔风振效应特征及影响因素分析

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (18) : 201-208.

论文

冷却塔风振效应特征及影响因素分析

张军锋1, 2，杨军辉1，葛耀君2，赵林2

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Features of wind dynamic effects of a hyperboloidal cooling tower and the influence factors

ZHANG Junfeng1, 2, YANG Junhui1 ,GE Yaojun2, ZHAO Lin2

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摘要

为深入理解冷却塔风振响应特征及其影响因素，通过动力计算获取风振响应并分析各内力的风振特征，尤其关注背景和共振分量σB、σR在总脉动响应σ中的贡献；另外，调整阻尼比ζ、风速取值V和风压子午向相关性等参数，探究其对内力脉动响应的影响幅度并分析其影响机理。结果表明：各内力σB和σR的耦合性极小，可以忽略；σR对σ的贡献随位置和响应而变化，忽略σR时，塔筒中下区段双向轴力的σ下降约10%，在顶部下降约20%~30%，环向弯矩的σ在整个塔筒高度都下降约20%~30%；随ζ的增加，各响应的σR显著下降且可由公式近似计算，但因各内力σR对σ的贡献权重有限，随ζ增加时σ的下降并不显著，尤其是双向轴力；通过调整风速V发现，σR与V3成正比；子午向相关性主要是通过σB而影响σ，故主要对双向轴力的σ有影响，但子午向相关性的提高使FY的σ有所增加但使FX的σ有所减小。结合结构配筋设计可知，子午向的共振效应可以忽略，而环向的共振效应不可忽略。

Abstract

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 V3.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.

关键词

冷却塔 / 风振效应 / 影响因素 / 阻尼比 / 风速取值 / 子午向相关性。

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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[J]. Journal of Vibration and Shock, 2018, 37(18): 201-208

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