考虑筋/板相互作用的环肋圆柱壳屈曲强度分析

Buckling strength of ring-stiffened cylindrical shell considering plate/stiffener interaction

环肋圆柱壳是潜艇耐压壳体的一种主要结构形式。环肋圆柱壳的失稳破坏主要表现在肋骨间的壳板失稳和总体失稳。在计算肋骨间的壳板失稳时,传统方法认为肋骨为壳板提供简支边界,忽略了在边界上肋骨和壳板的相互影响。在实际结构中,由于肋骨提供扭转刚度,壳板在与肋骨相交的边界上将存在弯矩,并非自由支持边界。因而,壳板失稳时,筋/板产生相互影响,提高了壳板的屈曲强度。本文的主要目的是,推导考虑筋/板相互影响的环肋圆柱壳壳板屈曲强度的理论计算方法,分析筋/板的相互关系。通过本文的算例表明,本文推导的计算方法以及所编制的计算程序是可靠的,可以用于工程设计。

Ring-stiffened cylinder is one of the most important structure types in submarine.There are two buckling models for ring-stiffened cylinder,buckling of the cylindrical shell between the ring-stiffeners and total buckling of the ring-stiffened cylinder.Traditionally,the buckling strength of cylindrical shell is evaluated by taking the boundary of cylindrical shell as simply supported.However, in actual ring-stiffened cylindrical shell,the buckling strength is expected to increase due to the influence of the torsional rigidity of the ring-stiffeners.The main purpose of this paper is to develop an analytical formula for estimating buckling strength of ring-stiffened cylindrical shell considering the influence of plate/stiffener interaction. The calculated results show that the developed analytical formula is reliable and can be used in engineering design.