SCF equations for TK square-to-round tubular joints

Abstract

A parametric stress analysis of TK 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 useful information for using such sections in the design of complex structures. Two types of axial loading and in-plane bending, and one type of out-of-plane bending were analysed. 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. Although the equations obtained are useful for estimation of stress concentration factors, further work, including experimental verification, should be carried out to study the said type of joint in detail before the equations can be presented for practical use. 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. The stress concentration factors for round-to-round tubular joints are generally lower than those of the corresponding square-to-round tubular joints.