张军锋, 葛耀君, 赵林. 双曲冷却塔结构特性新认识[J]. 工程力学, 2013, 30(6): 67-76. DOI: 10.6052/j.issn.1000-4750.2012.02.0124
引用本文: 张军锋, 葛耀君, 赵林. 双曲冷却塔结构特性新认识[J]. 工程力学, 2013, 30(6): 67-76. DOI: 10.6052/j.issn.1000-4750.2012.02.0124
ZHANG Jun-feng, GE Yao-jun, ZHAO Lin. NEW PERCEPTIONS ON THE STRUCTURE BEHAVIOR OF HYPERBOLOIDAL COOLING TOWERS[J]. Engineering Mechanics, 2013, 30(6): 67-76. DOI: 10.6052/j.issn.1000-4750.2012.02.0124
Citation: ZHANG Jun-feng, GE Yao-jun, ZHAO Lin. NEW PERCEPTIONS ON THE STRUCTURE BEHAVIOR OF HYPERBOLOIDAL COOLING TOWERS[J]. Engineering Mechanics, 2013, 30(6): 67-76. DOI: 10.6052/j.issn.1000-4750.2012.02.0124

双曲冷却塔结构特性新认识

NEW PERCEPTIONS ON THE STRUCTURE BEHAVIOR OF HYPERBOLOIDAL COOLING TOWERS

  • 摘要: 通过动力特性分析和等效静风荷载作用下响应分析,并借鉴简单圆环结构和悬臂结构的结构特性,对双曲冷却塔结构特性进行了阐述。研究发现,作为圆截面高耸空间薄壁结构,双曲冷却塔的静动力结构特性同时体现了简单水平圆环结构和子午向悬臂结构的特点:对于低阶模态,其振型是上下弹性支撑水平圆环结构(条带)和左右弹性支撑子午向悬臂结构(条带)振型的耦合,且频率主要受环向刚度控制;风荷载作用下塔筒位移和内力的环向分布与外表面风压分布模式一致,各荷载效应的最值主要受迎风区和侧风区风压影响并受环向风压分布的不均匀性所控制;子午向轴力的环向分布提供了整体抗倾覆弯矩,因此表现出明显的向下积聚现象,这也是悬臂结构顺风向整体倾覆弯矩的体现,并且这种积聚效应与子午线型有关。

     

    Abstract: The strucuture behavior of a hyperboloidal cooling tower was illustrated based on the analysis of dynamic properties and equivalent static wind load effects according to some basic properties drawn from horizontal ring structures and meridian cantilever beams.It was shown that as a thin-wall and high-rise structure with circular cross section,the strucuture behavior of a cooling tower reflects both that of horizontal rings and meridian cantilever beams.Its mode shapes can be deemed as the coupling of mode shapes of horizontal rings (stripe) supported elastically at top and bottom edges and meridian cantilever beams (stripe) supported elastically in right and left sides,and the natural frequencies are much influenced by the latitude stiffness.The displacement and internal forces have similar latitude distribution with the distribution of external wind pressure CP(θ).The maximum of displacement and internal forces are all primarily influenced by the windward and sideward wind pressure,and consequently dominated greatly by the non-uniformity of CP(θ).The latitude distribution of meridian axis force provides the resisting overturning moment implicitly and it aggregates downward along the height as the overturning moment,whics is the reflection of structural behaviors of meridian cantilever beams.In addition,the aggregation is influenced by the meridian curve.

     

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