中文摘要：

针对双曲壳体冷却塔的静风整体稳定进行研究,介绍了现行规范条款的试验背景,探讨了其试验方法和结果,并对试验结果和计算结果进行比较分析。以现阶段代表性大型双曲壳体冷却塔为例,在动力特性分析的基础上,研究了其分支点和极值点整体失稳特征和内压取值及加劲环设置对整体稳定性的影响。研究发现：冷却塔塔筒的振型可以看作是上下弹性支撑水平圆环结构和左右弹性支撑子午向悬臂结构振型的耦合;其风压作用下的几何非线性特征并不明显,结构的失稳是突然发生的,极值点失稳形态既表现出静力计算的变形特征,又带有分支点屈曲模态的倾斜谐波;冷却塔整体稳定性随内压取值的增加而显著下降,而增设加劲环能够增加和协调塔筒刚度分布从而提高结构的稳定性,并且加劲环设置在失稳形态变形最大的位置效果最为显著。

英文摘要：

The researches were initiated for the global aerostatic stability of hyperboloidal cooling towers.Background experimental tests of the specifications in current codes were introduced and discussed,including the tests methods,results and comparison between tests and numerical calculations.Followed by the analysis of dynamic properties,the global aerostatic stability of a representative super cooling tower was studied based on the bifurcation buckling and limit point buckling theories,especially the effects of inner pressure and stiffening rings.The mode shapes of cooling tower shell can be deemed as the coupling of mode shapes of horizontal rings supported elastically at top and bottom edges and meridian cantilever beams supported elastically in right and left sides.For super cooling towers under static wind load,the geometric nonlinearity behavior is negligible,the transform from stability to instability is abrupt and the limit point buckling deformation is characterized by both the static deformation and bifurcation buckling mode shapes.The global stability of cooling tower decrease remarkably with the inner pressure increase;additional stiffening rings which reinforce and coordinate the shell stiffness have great favorable value for the global stability of super cooling tower and the additional stiffening ring will provide the most benefit if it locates where the most prominent buckling deformation shows up.