The aim of this work is to analyze, numerically, the elastic and elastoplastic behavior of three tubular T-joints with different cross-sections of braces. The first one is circular and the others are elliptical but assembled differently (longitudinal and transversal positions).The elastic study is to compare, in three charge cases, the geometric stress variation around the weld toe for the three T-joints. In the elastoplastic study, the limit loads of these joints were compared for each load case. In the order to facilitate interpretations, the results are presented in graphical form. The numerical simulations are performed using Patran and Nastran softweres.