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承受轴向和周边径向压力的大型薄壁钢柱壳结构的稳定性分析是一个十分复杂的问题.根据理想壳体结构的屈曲平衡方程得出的临界应力,结合德国和我国的设计规范,通过有限单元法研究了初始缺陷、环向加劲肋间距、大开孔对薄壁圆柱壳稳定性的影响.结果表明:初始缺陷可使薄壁柱壳的极限屈曲应力降低至理想壳体临界应力的1/4以下;环向加劲肋间距的减小能够使得壳体极限屈曲应力显著增加,进而大大地提高了壳体的轴向承载力;大开孔的存在严重削弱了壳体的整体稳定性.上述结论对于薄壁柱壳的稳定性分析具有一定的理论意义和实用价值.
The analysis of the stability of large-scale thin-walled steel cylindrical shells subjected to axial and radial radial compressive stresses is a very complicated problem.According to the critical stress of buckling balance equation of ideal shell structure, combined with the design rules of Germany and China, The element method is used to study the influence of the initial defects, the circumferential stiffener spacing and the large opening on the stability of the thin-walled cylindrical shell. The results show that the initial buckling can reduce the ultimate buckling stress of the thin- . The decrease of the circumferential stiffener spacing can significantly increase the ultimate buckling stress of the shell and greatly increase the axial bearing capacity of the shell. The existence of the large open hole severely weakened the overall stability of the shell. For the stability of thin-walled cylindrical shell analysis has a certain theoretical significance and practical value.