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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。
Through the analysis of dynamic characteristics and response under the equivalent static wind load, the structure characteristics of the hyperbolic cooling tower are described based on the structural characteristics of the simple ring structure and the cantilever structure. It is found that the static and dynamic structural characteristics of the hyperbolic cooling tower, as a high-rise thin-walled circular space structure, show the characteristics of the simple horizontal ring structure and the meridional cantilever structure. For the low-order mode, the vibration modes are upper and lower elastic supports Horizontal ring structure (strip) and the left and right radial support radial cantilever structure (strip) vibration mode coupling, and the frequency is mainly controlled by the circumferential stiffness; wind load tower movement and internal force of the circular distribution and external surface The distribution pattern of wind pressure is consistent. The maximum value of each load effect is mainly controlled by the wind pressure in the windward and crosswind areas and is controlled by the inhomogeneous wind pressure distribution. The radial distribution of axial force in the meridional direction provides an overall anti-overturning Bending moments, and therefore show a significant downward accumulation, which is the embodiment of the cantilever structure downwind moment of the overall performance of the wind, and this accumulation effect and meridian type.