Buckling Failure Analysis of Slender Composite Structure with Telescopic Boom and Truss

With continuous improvement of lifting height and operation range for all-terrain crane in engineering construction, the buckling failure analysis of slender boom composite structure has become a hot research direction in order to ensure the safety and efficiency. In this paper, eigenvalue buckling analysis and nonlinear buckling analysis under multiple loads are carried out on the boom system of telescopic boom and truss auxiliary boom. The results show that the instability will occur in the amplitude plane for slender structure with super-lift system. Meanwhile, as the increase in the elevation angle for boom structure, the buckling load value increases and the stability is enhanced. Compared with geometric nonlinear and eigenvalue buckling load, when the elevation angle of the boom is 70°, the difference can reach 72.53%. Moreover, geometric initial defects are introduced. Compared displacement–load curves and buckling load values with and without geometric initial defects, the influence on slender composite structure is smaller. The results show that in order to prevent the buckling failure of structure, the hoisting load should not exceed rated load when the elevation angle is small, which provides a basis for engineering design.