非均匀土作用下圆柱壳稳定性的数值分析

S. Kosytsyn, V. Akulich
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引用次数: 2

摘要

本研究的目的是确定在沿圆柱壳纵向轴向土体物理力学性质不均匀的情况下,在非线性任务公式中空间模型壳-土系统的临界屈曲载荷。方法。采用有限元软件ANSYS对该问题进行了数值求解。编制了两个壳土系统空间模型的计算实例。土壤被分成两个相等的部分,具有不同的物理和机械性质。用几何非线性、物理非线性和构造非线性的表述来解决问题。非线性是由于需要通过迭代过程找到接触区并确定壳的时变位置。土壤由体积元素建模,每个元素由20个节点组成。外壳由平面元素建模,每个平面元素由四个节点组成。采用单侧动作接触元件。临界屈曲载荷是相对于自身重量的实际载荷确定的。结果。通过两个空间模型壳-土系统的计算得到了临界荷载。对结果进行了比较分析。给出了壳体相对于实际载荷的稳定裕度的评估。
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Numerical analysis of cylindrical shell stability interacting with inhomogeneous soil
The research is aimed at determining the critical buckling load of the spatial model shell - soil system in the case of inhomogeneous physical and mechanical soil properties along the longitudinal axis of the cylindrical shell in a nonlinear formulations of the task. Methods. The task is solved by a numerical method using a finite element complex ANSYS. Two calculated cases of the spatial model shell - soil system are compiled. The soil is divided into two equal parts with different physical and mechanical properties. The problem was solved in geometrically, physically and constructively nonlinear statement. Nonlinearity is due to the need to find the contact zone through an iterative process and determine the time-varying position of the shell. The soil is modeled by volumetric elements, each consisting of twenty nodes. The shell is modeled by flat elements, each consisting of four nodes. Contact elements of one-side action are used. Critical buckling load are determined relative to the actual load of its own weight. Results. Critical loads are obtained from two calculated cases of the spatial model shell - soil system. There is a comparative analysis of the results. An assessment of the stability margin of the shell relative to the actual load is given.
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发文量
26
审稿时长
18 weeks
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