摘要
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。
The large-scale thin-walled cylindrical shells used in the chemical or electric power engineering are always located some beams to support attached equipment because of the technology requirement. Consequently, the cylinder wall is subjected to partial axial compression from the beam. In the consideration of circumferential weld imperfection, a great amount of nonlinear numerical analyses are conducted to investigate the stability of the cylindrical shells when the cylinders are subjected to partial axial compression with the loading subtended angle being less than 10°. The research shows that the circumferential weld imperfection significantly influences the buckling bearing capacity of the cylinder subjected to partial axial compression. When the circumferential weld is located on the height where the maximum inward radial displacement occurs in the post buckling mode of the perfect cylinder, the imperfection causes the most unfavorable influence. The more significant amplitude of the weld imperfection will reduce the buckling bearing capacity of the cylinder, but the amplitude has little influence on the post buckling performance. The interaction between＇neighboring weld imperfection slightly increases the buckling bearing capacity of the cylinder. Based on a great many numerical computation results, the design recommendation is suggested with the varying imperfection amplitude and the ratio of radius against shell wall.
出处
《工程力学》
EI
CSCD
北大核心
2009年第4期38-45,共8页
Engineering Mechanics
关键词
结构工程
稳定
有限元分析
薄壁圆柱壳
局部轴向压力
环向焊缝缺陷
屈曲
后屈曲性能
structural engineering
stability
finite element analysis
cylindrical shells
partial axial compression
circumferential weld imperfection
buckling
post buckling performance
