SCF equations for DT/X square-to-round tubular joints

Abstract

A parametric stress analysis of DT/X square-to-round tubular joints subjected to axial loads and in-plane and out-of-plane bending moments has been performed using the finite element technique in order to provide a sound basis for using such sections in the design of complex structures. The results of this analysis are presented as a set of equations expressing the stress concentration factor as a function of the relevant geometric parameters for various loading conditions. A comparison is made between the results obtained for square-to-round tubular joints and those obtained for round-to-round tubular joints by other researchers. In general, the stress concentration factors for square-to-round tubular joints are generally lower than those of the corresponding round-to-round tubular joints when the joints are subject to axial loads and out-of-plane bending moments. But the reverse is true when the joints are subject to in-plane bending moments.