超大型冷却塔单塔外表面风荷载三维效应及其设计取值

邹云峰;牛华伟;陈政清

振动与冲击 ›› 2013, Vol. 32 ›› Issue (24) : 76-82.

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PDF(2098 KB)
振动与冲击 ›› 2013, Vol. 32 ›› Issue (24) : 76-82.
论文

超大型冷却塔单塔外表面风荷载三维效应及其设计取值

  • 邹云峰,牛华伟,陈政清
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Three-dimensional effect and design values of outer surface wind loading forsingle super-large cooling tower

  • Zou Yun-feng Niu Hua-wei Chen Zhen-qing
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摘要

风荷载是冷却塔设计的控制性荷载,规范中将沿高度、环向变化的平均风压系数分布曲线 简化为沿高度不变的分布曲线 ,该简化可能会对某核电站200m高超大型冷却塔的设计产生不利影响。首先,本文基于刚性模型测压风洞试验获得了该超大型冷却塔单塔的平均风压系数三维曲线 ,对外表面风荷载三维效应进行了分析;然后,采用有限元方法对三维曲线 与简化曲线 产生的风致响应进行了比较,并对结果产生原因进行了分析。结果表明:外表面风荷载三维效应显著,两端的阻力系数显著大于中段;尽管简化曲线 低估了结构的风荷载,但由于冷却塔风致响应与荷载分布形式更为密切相关,其产生的风致响应与三维曲线 基本相当,该简化可满足该冷却塔的设计要求。

Abstract

Wind loading is the control load for the design of cooling tower. The real mean wind pressure coefficient distribution curve which varying with tower height is simplified as a height-constant curve in design code, and this simplification may has an adverse effect on the design of a 200m high super large cooling tower of an nuclear power plant. Wind tunnel test were carried out to measure real mean wind pressure coefficient distribution curve , and then analysis on three-dimensional effect of wind load on the outer surface of the cooling tower was done, finally the wind-induced responses under the action of real curve and simplified curve were compared by finite element method. The test result indicated that wind loading of both two ends significantly greater than the middle. It was also shown that the wind-induced responses under the action of real curve and simplified curve are basically consistent due to wind load distribution is more important than magnitude for cooling tower wind-induced response, and the simplified curve could be used to design the super large cooling tower.


关键词

冷却塔 / 风洞试验 / 平均风压系数 / 阻力系数 / 风致响应

Key words

cooling tower / wind tunnel test / mean wind pressure coefficient / drag coefficient / wind-induced response.

引用本文

导出引用
邹云峰;牛华伟;陈政清. 超大型冷却塔单塔外表面风荷载三维效应及其设计取值[J]. 振动与冲击, 2013, 32(24): 76-82
Zou Yun-feng Niu Hua-wei Chen Zhen-qing. Three-dimensional effect and design values of outer surface wind loading forsingle super-large cooling tower[J]. Journal of Vibration and Shock, 2013, 32(24): 76-82

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