点击次数：

论文类型：期刊论文

发表时间：2015-12-01

发表刊物：JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH

收录刊物：SCIE、EI、Scopus

卷号：115

页面范围：206-222

ISSN号：0143-974X

关键字：Crawler crane; Lattice-boom structure; Geometrical nonlinear elastic instability; Co-rotational substructure element; Movable boundary; Multiple loading conditions

摘要：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.