中文摘要：

为研究内部加劲环和外部子午向加劲肋对特大型冷却塔静风响应的影响规律,以国内在建某电厂四塔组合超规范高度限值的220m特大型冷却塔为例,针对光滑塔、加肋塔、加环塔和加肋加环塔四种塔型设计方案,进行刚体测压模型风洞试验,获得该特大型冷却塔表面风压分布模式和塔群系数,并采用有限元方法对比分析了四种冷却塔模型动力特性和风致响应特征。在此基础上,提炼出加劲环和子午肋的设置对特大型冷却塔静风响应的影响规律。研究表明：加劲环的套箍作用能提高冷却塔整体结构刚度和基频,并显著减小了环基内力;子午肋通过减小塔筒负压极值明显减小了塔筒、支柱和环基的内力,同时也略微降低冷却塔的整体结构基频;同步加肋加环冷却塔整体刚度较优且受力性能更好。

英文摘要：

In order to study the influence of internal stiffening ring and external meridian to the static windinduced responses on super large cooling towers, A 220m domestic beyond specification limits super large cooling tower which was combinated by four towers was taken as an example, Based on the smooth, ribbed, add ring and fibbed and ring towers, the wind tunnel test were conducted with the rigid model. The surface wind pressure coefficient distribution patterns and the group tower factor were obtained. The dynamic characteristic and the wind-induced response characteristics of the four kinds of cooling tower model were analyzed with the finite element method. On this basis, the influence law of stiffening ring and meridian rib to the static wind-induced responses of super large cooling tower was extracted. Research showed that the ferrule effect of stiffening ring could enhance stiffness of the structure and fundamental frequency of cooling tower. Meanwhile, the internal force of the circular foundation was reduced significantly. The internal force of tower drum, pillar and the circular foundation were greatly decreased by reducing the extreme of negative pressure which relying on meridian rib, and the overall structural fundamental frequency were reduced simultaneously. Adding rib and ring on the cooling tower could strength its stiffness and the mechanical property would be better.