Linear Stability Analysis of Space Compressive Structure of the Inverted-V Combinatorial Jib

Abstract

In order to study the problem of stability-losing load of the super-big crane jib with the inverted-V shape, this paper completed theoretical analysis, simulation and verification. Based on the stability-losing load formula considering shearing-force influence of compressed solid column, the limit load formula of the inverted-V combinatorial jib was obtained. Then, the method of force was applied to getting the shear angle formula of the inverted-V combinatorial jib under unit shear load. After using the proved formulas and software SAP2000 in linear buckling analysis of 28 combinatorial jibs consisting of two kinds of typical-section rods, the results demonstrated that: As for combinatorial structure consisting of cross-shaped web members, the error between results of the proved limit load formula and finite element calculation was within-5% when the aspect ratio of the inverted-V combinatorial jib was above 3.