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首页> 外文期刊>WSEAS Transactions on Applied and Theoretical Mechanics >Sensitivity Analysis of Stability Problems of Steel Structures using Shell Finite Elements and Nonlinear Computation Methods
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Sensitivity Analysis of Stability Problems of Steel Structures using Shell Finite Elements and Nonlinear Computation Methods

机译：壳体有限元和非线性计算方法对钢结构稳定性问题的敏感性分析

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The paper analyzes the influence of initial imperfections on the ultimate limit state of a slender strut, applying the ANSYS programme. The geometrical and material nonlinear finite element method was applied for the theoretical analysis. Modelling of the steel structure was performed using SHELL elements. The effect of input imperfections on the load-carrying capacity is evaluated by sensitivity analysis. This paper is devoted to a class of sensitivity analysis techniques that are known as the variance-based methods. Input imperfections are of random origin. The Sobol's sensitivity analysis was used to determine the sensitivity of load-carrying capacity of a strut with respect to the variance of initial imperfections. The sensitivity analysis results identify the imperfections the variability of which can influence the structure reliability. The Latin Hypercube Sampling method was applied for the evaluation of sensitivity indices. The computation model elaborated is unique with regard to its numerically demanding character.
机译：本文运用ANSYS程序分析了初始缺陷对细长支杆极限极限状态的影响。采用几何和材料非线性有限元方法进行理论分析。使用SHELL元素对钢结构进行建模。输入灵敏度对承载能力的影响通过敏感性分析进行评估。本文致力于一类敏感性分析技术，称为基于方差的方法。输入缺陷是随机产生的。 Sobol的敏感性分析用于确定支柱的承载能力相对于初始缺陷的敏感性。灵敏度分析结果确定了缺陷，这些缺陷的可变性会影响结构的可靠性。拉丁超立方体抽样方法用于敏感性指标的评估。阐述的计算模型就其数字要求特性而言是独特的。

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