Study on the axial compressive ultimate load-carrying capacity of high strength steel tubes with lattice boom

Lattice boom used on the crawler crane are welded by slender high strength steel tubes. Many studies show that actual bearing capacity of high-strength tubes is higher than stability calculated according to specification. To obtain and apply it engineering practice, a series axial loading tests carried out two kinds 20Mn2 S890 their damage load. By handling test data, coefficient fitting correction calculation formula Chinese structure The results conservative calculate using curve in specification, fitted more consistent with its capacity.