Identifying Critical Loads of Frame Structures with Equilibrium Equations in Rate Form

Identifying Critical Loads of Frame Structures with Equilibrium Equations in Rate Form
复制标题

用速率形式的平衡方程确定框架结构的临界载荷

DOI:
10.1155/2015/325969
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发表时间:
2015-08
影响因子:
--
通讯作者:
Wang Gang
Wang Gang
中科院分区:
工程技术4区
文献类型:
--
作者:
Qi Zhaohui;Kong Xianchao;Wang Gang

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框架结构在工程实践中应用广泛。它们很可能在受损前失去稳定性。第一临界荷载作为承载能力的指标,在此类结构的设计中起着至关重要的作用。本文提出了一种基于速率型控制方程的临界负荷辨识新方法。利用本文提出的方法,可以使用许多成熟的常微分方程数值方法。由于精确的结构切线刚度矩阵对稳定性分析至关重要,本文系统地讨论了获取切线刚度矩阵的方法。为了提高大型框架结构非线性稳定性分析的计算效率,还建立了同向子结构单元,降低了控制方程的维数。通过四个算例验证了该方法的有效性和有效性。
Frame structures are widely used in engineering practice. They are likely to lose their stability before damage. As an indicator of load-carrying capability, the first critical load plays a crucial role in the design of such structures. In this paper, a new method of identifying this critical load is presented, based on the governing equations in rate form. With the presented method, a great deal of well-developed numerical methods for ordinary differential equations can be used. As accurate structural tangent stiffness matrices are essential to stability analysis, the method to obtain them systematically is discussed. To improve the computational efficiency of nonlinear stability analysis in large-scale frame structures, the corotational substructure elements are formulated as well to reduce the dimension of the governing equations. Four examples are studied to illustrate the validity and efficiency of the presented method.
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