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A reduced stiffness approach for the buckling of open cylindrical tanks under wind loads

机译：一种减小刚度的方法，用于在风荷载作用下对敞开式圆柱形储罐进行屈曲

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摘要

This paper reports on the implementation of a lower bound approach to the buckling analysis of cylindrical shells for tanks subjected to wind loads. The formulation is based on a reduced energy model of the shell adapted to a special purpose, semi-analytical, finite element program in which it is possible to separately compute the membrane and bending energy contributions. First, the energy components are investigated, in order to identify stabilizing and destabilizing contributions. Second, an eigenvalue analysis is carried out using a reduced value of the stiffness, in which membrane components are eliminated on the basis that they are assumed to be eroded as a result of mode coupling catalyzed by imperfections. The methodology is employed for thin-walled, above ground, tanks under wind pressures. It is shown that the resulting critical loads constitute lower bounds to those obtained using a nonlinear analysis of the shell, including imperfections, and also to those obtained from experiments.
机译：本文报告了下限方法在承受风荷载的罐体圆柱壳屈曲分析中的应用。该公式基于适合特定用途，半分析的有限元程序的壳体的折减能量模型，在该模型中可以分别计算膜和弯曲能的贡献。首先，研究能量成分，以确定稳定和不稳定的贡献。第二，使用刚度的减小值进行特征值分析，其中膜组件被消除是基于它们被假定为由于缺陷催化的模式耦合而腐蚀的结果。该方法用于风压下的薄壁地面储罐。结果表明，所产生的临界载荷相对于使用壳体非线性分析（包括缺陷）获得的临界载荷以及通过实验获得的临界载荷构成了较低的极限。

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