Strength and deformability of lightweight metal trusses with elements from cut I-beams

Abstract

The article is devoted to the study of the strength and deformability of light metal trusses with elements made of cut I-beams based on experimental tests. A truss design is proposed based on the idea of a waste – free technology for obtaining the maximum number of truss elements in the process of cutting the initial billet-a rolling I-beam. The manufacturing technology of the farm, research tasks and test samples are described. The developed and manufactured designs of truss models were a geometric similarity of trusses with parallel belts with a span of 24 m, a cross – section height along the shelves of the belts-2.4 m, with the length of the belt panels equal to 3 m, calculated for different loads. The analysis of the obtained results showed that the theoretical values of axial stresses in the elements of truss models differ from the values of experimental axial stresses in General by no more than 8%. According to the results of numerical studies of the stress-strain state of trusses in the elastic stage of their operation, it was established: - truss structures have sufficient stiffness and strength (the coefficient of load-bearing capacity was a value that varies for trusses of various series within the range of 1.34 – 1.7); - the stress values in the truss elements calculated during the processing of the results of numerical studies have a large similarity with the stress values calculated on the basis of experimental data.