Tanks and silos are often designed as ring-stiffened cylindrical shells. Nowadays, the load-increasing effect of closely spaced ring stiffeners under axial compression has received limited attention in research and practice. Considering the structural safety, the ring-stiffened shell needs to be estimated on the conservative side in practice. This is not desirable in terms of modern lightweight steel structures. However, material efficiency is achieved by combining thin plates with ring-stiffeners. In this paper, small specimen experimental series are carried out to calibrate numerical models, which are subsequently used in parameter studies, because the large-scale experiments are cost-intensive and therefore difficult to carry out in the laboratory. The small cylindrical shells are manufactured by welding of two half-cylindrical shells and the ring stiffeners are spot-welded to the cylindrical shell. Geometric dimension of shell specimens is measured by 3D scanning technology. The measured geometric imperfection information is directly imported into the numerical model based on a mapping relationship and the buckling tests are recalculated by means of geometrically and materially nonlinear analysis with imperfection. The results indicate that the buckling resistance calculated by the Finite Element analysis is very close to that of the test results. The initial geometric imperfection is discussed with reference to the Eurocodes design standard. Furthermore, influence of the ring-stiffener parameter, including imperfection amplitude, radius over thickness ratio, geometry of ring stiffener etc., on the buckling load and knockdown factor is discussed based on a large number of parameter study.

储罐和筒仓通常设计为环形加劲的圆柱壳。如今，在轴向压缩下紧密间隔的环形加劲肋的载荷增加效果在研究和实践中受到的关注很少。考虑到结构安全性，在实践中需要从保守方面估算环刚壳。就现代轻质钢结构而言，这是不希望的。但是，通过将薄板与环型加劲肋相结合可以实现材料效率。在本文中，进行小样本实验系列来校准数值模型，随后将其用于参数研究，因为大规模实验成本高昂，因此难以在实验室中进行。小圆柱壳是通过焊接两个半圆柱壳制造的，环形加劲肋点焊到圆柱壳上。壳标本的几何尺寸是通过3D扫描技术测量的。根据映射关系将测得的几何缺陷信息直接导入到数值模型中，并通过几何和材料非线性的缺陷分析重新计算屈曲试验。结果表明，通过有限元分析计算的屈曲阻力与测试结果非常接近。最初的几何缺陷是参考Eurocodes设计标准进行讨论的。此外，环型加强筋参数的影响，包括缺陷幅度，半径与厚度之比，环型加强筋的几何形状等。