Modelling of double chord rectangular hollow section T-joints by finite element method

A linear elastic T-joint comprised of double chord RHS has been modelled by treating the mated flanges as thin plates supported by coupled linear springs thus simulating the action of the side walls and connecting bottom flanges. A rigid rectangular inclusion is presumed for the branch member. Two loading conditions are analyzed—branch member axial force and branch member bending moment. The finite element formulation that is proposed incorporates rectangular plate and edge boundary spring elements. The model is then used to determine the punching shear and rotational stiffnesses of both double chord T-joints and single chord T-joints, thus demonstrating its versatility. The numerical values obtained are in good agreement with the experimental results available in the literature.