为研究内部加劲环和外部子午肋对超大型冷却塔施工过程风致稳定性的影响,以国内某电厂在建的高度为220 m的超大型冷却塔为研究对象,针对光滑塔、加肋塔、加环塔和加肋加环塔4种设计方案,分别进行考虑内吸力、施工荷载、混凝土龄期实时变化的冷却塔施工全过程整体、局部稳定性及极限承载力对比分析.在此基础上,研究加劲环和子午肋对施工期超大型冷却塔风致稳定性能的影响规律.研究结果表明:加劲环可有效提高冷却塔施工全过程的屈曲稳定性,但对结构的局部稳定性不利;布设子午肋导致结构施工全过程屈曲稳定性和极限承载力降低,但可提高结构的局部稳定性;布置加劲环和子午肋可显著改善冷却塔整体、局部和施工全过程屈曲稳定性能及极限承载力.%To study the influence of internal meridian rib and external stiffening ring on the wind-induced stable performance responses of super large cooling towers, a super large cooling tower under construction with the world's highest height of 220 m in a domestic power plant was taken as an example. Four design schemes including smooth tower, meridian ribbed tower, stiffening ring tower, and meridian ribbed and stiffening ring tower were proposed. The overall stability, local stability and ultimate bearing capacity of cooling tower during construction were compared and analyzed considering the internal suction, construction load and concrete age. Then, the influence rule of stiffening ring and meridian rib setting on the wind induced stability of super large cooling tower was studied. The results show that setting stiffening ring improves the global stability of the structure by reducing wind-induced response, but it will significantly weaken the local stability of the structure. At the same time, setting radial on results in the decrease of structural overall stability and ultimate bearing capacity, but enhances the local stability of the structure. In addition, setting stiffening ring and meridian rib on the cooling tower significantly improves the whole, local buckling and construction whole process stability and ultimate bearing capacity of the cooling tower.
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