双曲线型钢结构冷却塔缺陷敏感性分析

Imperfection Sensitivity Analysis of Hyperbolic Steel Cooling Towers

参考国内现有规范,考虑几何非线性与材料非线性,利用ANSYS软件对一座高150m的双曲线型钢结构冷却塔进行多种缺陷及多缺陷值下的稳定计算,讨论了单层网壳、双层网壳及不同网格形式下结构的缺陷敏感性.结果表明,单层网壳结构对某些缺陷敏感性高,双层网壳结构中采用三角形网格时的稳定系数最高,四角锥网格的缺陷敏感性最低.

According to the existing domestic codes, stability analysis of a 150 m high hyperbolic steel cooling tower, with different kinds of imperfection and different values of imperfection, is made by ANSYS software, considering both geometry and material nonlinearity. Thus, the imperfection sensitivity of steel cooling towers with single-layer and double-layer latticed shell and different grid forms is analyzed. The results show that the imperfection sensitivity of single-layer latticed shell is high, the double-layer latticed shell, with triangle mesh structure has the highest buckling load factor, and structure with square pyramid mesh has the lowest imperfection sensitivity.