Ultimate strength of RHS T-joints under static compression branch force

In this paper, a theoretical model is presented for the analysis of uni-planar rectangular hollow section (RHS) T-joints under an axial force, P, acting through the branch member. The finite element computer program COSMOS/M is used to determine both of the ultimate and the yield load carrying capacity of the RHS T-joint. The results calculated by the proposed model, taking into consideration the effect of the geometrical parameters of the joints, are compared with those obtained experimentally by the researchers and theoretically with the plastic mechanism models. Also, the results are presented in the form of P-δ curves to determine the modes of failure that occurred in the examined joints. Depending on the results of the proposed model, a verification of modes of failure is performed in order to determine the limits of the geometrical parameters of the joint at which the failure mode changes from a certain failure mode to another.