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化工、电力工程中的大型薄壁圆柱壳结构内通常因工艺要求而设置一些设备支承梁,壳壁因此承受由梁传递来的局部轴向压力。该文考虑环向焊缝缺陷的影响,对荷载跨角小于10o的承受局部轴向压力作用的大量薄壁圆柱壳的稳定性能进行了非线性数值分析。研究表明:环向焊缝缺陷对于柱壳承受局部轴向压力造成很大的影响,当焊缝位于完善柱壳后屈曲模态最大内凹处时,影响最为不利;缺陷幅值越大屈曲承载力越低,但是对于后屈曲性能影响很小;相邻焊缝缺陷的相互影响对柱壳的屈曲承载力略有提高。根据大量数值计算结果提出了不同缺陷幅值和径厚比下的设计建议。
In large-scale thin-walled cylindrical shell structures in chemical engineering and power engineering, some equipment support beams are usually provided due to the technological requirements, and the shell walls thus bear the local axial pressure transmitted by the beams. In this paper, the influence of circumferential weld defects is considered. The nonlinear numerical analysis of the stability of a large number of thin-walled cylindrical shells subjected to local axial compression with a load span of less than 10 ° is carried out. The results show that the circumferential weld defects have a great influence on the axial compressive stress of the column shell. When the weld seam is located in the maximum concave of buckling mode, the influence is most unfavorable. The larger the defect amplitude is, The lower the force, the smaller the post-buckling performance is. The interaction between adjacent weld defects slightly increases the buckling capacity of the cylindrical shell. Based on a large number of numerical results, the design suggestions of different defect amplitude and aspect ratio are proposed.