超大型双曲面钢网壳冷却塔风致失效与倒塌分析

ANALYSIS OF WIND-INDUCED FAILURE AND COLLAPSE SIMULATION OF SUPER-LARGE HYPERBOLIC STEEL RETICULATED SHELL COOLING TOWER

  • 摘要: 双曲面钢网壳结构因轻质高强、施工便捷等优点,开始被用于工业冷却塔的设计和建造中,考虑其柔度大和阻尼低的特点,亟需评估其抗风安全性和稳定性。为了研究超大型钢结构冷却塔的风致失效全过程,以220 m高的双曲面钢网壳冷却塔作为研究对象,开展刚性模型测压风洞试验,生成作用在冷却塔有限元模型上的风压荷载,采用有限元软件ABAQUS对该冷却塔进行非线性动力效应分析,开展致灾强风作用下冷却塔三维结构弹塑性破坏仿真模拟,探究了钢网壳冷却塔的风致失效全过程,量化了失效倒塌过程易损位置和损伤发展形态,明确了钢构件塑性发展导致的结构刚度整体削弱和结构几何非线性大变形是钢网壳冷却塔风致失效倒塌的主导原因。

     

    Abstract: Due to the advantages of light mass, high strength and convenient construction, hyperbolic steel reticulated shell has been used in the design and construction of super-large cooling towers. Considering its large structural flexibility and low damping level, it is necessary to evaluate the wind resistance safety and stability of steel cooling towers. In order to study the whole wind-induced failure process of super-large steel cooling towers, one hyperbolic steel reticulated shell cooling tower with the height of 220 m was taken as a case study. The average and fluctuating wind loads were measured in the rigid tower model under wind tunnel tests, which were applied directly to a structural finite-element model by the wind pressure time history. The nonlinear dynamic analysis of the cooling tower was carried out by using the commercial software ABAQUS. Through the simulation of the elastic-plastic failure of the cooling tower under the action of disaster-causing strong winds, the whole wind-induced failure of the steel reticulated shell cooling tower was explored. Therefore, the vulnerable positions and damage development forms during the failure and collapse process were quantified. It is revealed that the structural stiffness decay due to material plasticity and the large deformation of geometric nonlinearity are the dominant factors during the wind-induced failure and collapse of the steel reticulated shell cooling tower.

     

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