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首页> 外文期刊>Journal of Constructional Steel Research >Elastic instability analysis for slender lattice-boom structures of crawler cranes
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Elastic instability analysis for slender lattice-boom structures of crawler cranes

机译：履带起重机细长动臂结构的弹性不稳定性分析

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This paper analyzes the geometrical nonlinear elastic instability for slender lattice-boom structures of crawler cranes. To reduce the dimension of equilibrium equations, the slender lattice-boom structure is divided into several substructures and an element-independent co-rotational substructure element is formulated. Including the discretization of gravity, a static condensation procedure for the co-rotational substructure element is implemented. In consideration of movable boundaries of the lattice-boom structure, the tensile forces of luffing cables related to the guyed mast rotation are given for the equilibrium equations. After that, accurate tangent stiffness matrices are formulated by taking the derivative of the generalized nodal forces with respect to the structural displacements and the guyed mast angle. To improve the computational efficiency of instability analysis under multiple loading conditions, a new method for identifying the instability loads of the slender lattice-boom structures is presented, based on the equilibrium equations in rate form. Two numerical examples show the availability and efficiency of the method. (C) 2015 Elsevier Ltd. All rights reserved.
机译：本文分析了履带起重机细长晶格臂结构的几何非线性弹性不稳定性。为了减小平衡方程的维数，将细长的晶格-动臂结构划分为几个子结构，并制定了与元素无关的同向旋转子结构元素。包括重力离散化，对同向旋转的子结构元件执行静态冷凝过程。考虑到晶格臂结构的可移动边界，针对平衡方程给出了与拉杆桅杆旋转有关的变幅电缆的拉力。此后，通过取广义节点力相对于结构位移和拉杆桅杆角的导数，可以得出精确的切线刚度矩阵。为了提高多载荷条件下失稳分析的计算效率，基于速率形式的平衡方程，提出了一种识别细长晶格臂结构失稳载荷的新方法。两个数值例子表明了该方法的有效性和有效性。 （C）2015 Elsevier Ltd.保留所有权利。

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