【摘要】 轴对称半解析环元法是求解双曲线冷却塔动力问题的有力工具,但冷却塔体下部的柱支撑与上部半解析环元的连接是分析过程中一个困难的关键问题。本文利用半解析环元刚度矩阵的显式结果,采用刚度等效的工程方法,直接将柱支撑等效为一个旋转薄壳环元,给出了该环元的等效厚度计算公式。计算结果表明,这种等效简便、合理,可用于工程实际。更多还原

【Abstract】 This paper presents the explicit expressions of stiffness and mass matrices of finite ring elements for axisymmetric thin shell. Based on the explicit expressions a equivalent thin shell finite ring element of supporting columns of hyperbolic cooling towers is proposed by using equivalent stiffness method. The formula of the thickness of equivalent finite ring element and formulas of internal forces of supporting columns are given. Comparisons of calculational natural frequencies of a practical hyperbolic cooling tower by the equivalent method with those by other comprehensive method and SAP5 program show that the equivalent method has good accuracy and less analytical and numerical efforts.更多还原