基于双模量理论的高强度钢环肋圆柱壳总体稳定性塑性修正方法

Plastic modification methods based on Double Modulus Theory for general stability of ring-stiffened cylindrical shell of high strength steel

文章基于矩形截面压杆的双模量理论和高强度钢的材料弹塑性本构关系,建立了环肋圆柱壳结构总体稳定性塑性修正曲线及修正方法,结果表明,模型的计算结果与静水外压试验测得的塑性失稳压力值及有限元结果符合情况较好,压杆双模量理论模型虽然和环肋圆柱壳实际结构存在差异,但由此得到的塑性修正方法仍具有较好的工程精度,在应用于高强度钢环肋圆柱壳总体稳定性计算时适应性好,且形式简单,便于运用。

Considering elastic-plastic constitutive relationship of high strength steel, a plastic modification curve method, which was based on compressed pole with rectangular section under Double Modulus Theo-ry, was proposed for calculating the general stability of ring-stiffened cylindrical shell structure. The cal-culated results were validated by some examples to meet with FEM results and buckled pressure of high strength steel models under external hydrostatic pressure pretty well. The theoretical model of compressed pole under Double Modulus Theory is a little different from the true structure of cylindrical shell, however, the derived plastic modification method from DMT offered pretty good precision in engineering sense. Be-sides, the method has simple form and easy to use.