The steel cooling towers with cylinder-cone section,due to its light self-weight and regular tower shape,is gradually becoming a new trend in the construction of large-scale cooling towers in the thermal power industry.However,the large span and large space characteristics of this structure result in strong earthquake re-sponse and overall wind-induced stability,which are challenges in the design of steel tower structures.This pa-per uses the finite element software SAP2000 to establish a steel cooling tower model,performs calculations un-der constant load,wind load and earthquake action,and analyzes the stress distribution condition of the tower.The first-order linear buckling mode is taken as the initial defect state,and H/300(H is the tower height)is taken as the initial defect size.Based on the dual nonlinear analysis,the wind-induced nonlinear buckling law of this type of steel cooling tower structure under real working conditions is explored.The results show that un-der multi-directional earthquake,the displacement of the steel cooling tower meets the requirements of JGJ 7-2010 Technical Specifications for Spatial Grid Structures.The cone and the straight tube section mainly undergo bending deformation and shear deformation respectively,and the deformation performance of the entire tower body meets the seismic fortification requirements of China.Considering the double nonlinearity,the critical buckling bearing capacity of the cooling tower is reduced,and the reinforcement ring set in the straight section effectively ensures the structural rigidity.This study provides references for evaluating the seismic performance and stability of similar large-span steel towers.
维普
万方数据
