Investigation of the buckling behaviour of ring‐stiffened cylindrical shells under axial pressure
Investigation of the buckling behaviour of ring‐stiffened cylindrical shells under axial pressure
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DOI：
10.1002/cepa.1526
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发表时间：
2021-09
期刊：
影响因子：
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通讯作者：
H. Pasternak;Zheng Li;A. Jäger‐Cañás
中科院分区：
文献类型：
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作者：
H. Pasternak;Zheng Li;A. Jäger‐Cañás
储罐和筒仓通常设计为环肋圆柱壳。目前，在轴压作用下紧环加劲肋的增载效应在研究和实践中很少受到关注。考虑到结构的安全性，在实际工程中，环肋壳的计算往往需要偏于保守。这在现代轻型钢结构方面是不期望的。近年来的数值研究表明，环形加劲肋可以提高圆柱壳的轴向屈曲性能。此外，对环肋结构的数值计算分析表明，按现行设计标准，轴向压力作用下的环肋圆柱壳在实际应用中是不经济的。因此，在广泛的参数研究付诸实践之前，需要实验保证的结果。在本文中，进行了小样本系列以校准数值模型，随后用于参数研究，因为大规模实验（例如1：1的比例范围）成本高昂，因此难以在实验室中进行。因此，测试了所选半径为796 mm、厚度为1 mm的相对较小的试样。小型圆柱壳由两个半圆柱壳焊接而成，环形加强筋点焊在圆柱壳上。利用三维扫描技术对壳体的几何缺陷进行测量。最后，对试验结果进行了几何非线性和材料非线性分析，并考虑了缺陷。结果表明，数值模拟与实验结果吻合较好。
Tanks and silos are often designed as ring‐stiffened cylindrical shells. Nowadays, the load‐increasing effect of tight ring stiffeners under axial compression has received just little 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. Recently research results based on the numerical studies show that the axial buckling behavior of cylindrical shells can be enhanced by using ring stiffeners. In addition, the analysis of ring‐stiffened structures with numerical calculations demonstrate that cylindrical shells with ring stiffeners under axial pressure are uneconomic according to the current design standard in practice. Therefore, the results guaranteed by experiments are required, before the extensive parametric studies are putted into practice. In this paper, small specimen series are carried out to calibrate numerical models, which are subsequently used in parameter studies, because the large‐scale experiments, in the scale range of e.g. 1: 1 are cost‐intensive and therefore difficult to carry out in the laboratory. Consequently, relative small specimens with the selected radius of 796 mm and thickness 1 mm are tested. The small cylindrical shells are manufactured by welding of two half‐cylindrical shells and the ring stiffeners are spot‐welded to the cylindrical shell. The geometrical imperfection of shells is measured by a 3D scanning technologies. Finally, the experiments by means of geometrically and materially nonlinear analysis with imperfections included are recalculated on the basis of the measured data. The results illustrate that the numerical simulation agrees well with the experimental results.