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Stiffening effect on the Xtype welded tubular joint is evaluated by a numerical procedure. Tubular joints with three kinds of stiffeners are analyzed by finite element technique using an elastoplastic isoparametric thick shell element. Two parameters are introduced to the evaluation of the stiffening effect; they are a mean equivalent plastic strain increment and a plastic work increment per unit volume. The parameters are calculated in the three cases of the stiffening types, and are compared with the experimental results prepared by the writers. It is concluded both of them are effective, and the former is recommendable. The calculation is stood on a static load condition, nevertheless the results can be applied to a fatigue problem because the fatigue resistance of the stiffened joint is in proportion to its static strength. Finite element analysis is also applied to the estimation of an optimum shape of the st.

Lowcycle fatigue tests were conducted for Xtype welded tubular joint specimens with three types of stiffeners. The test data are arranged in the form of total plastic work, total strain, and the SNcurve; and the relationship between type of stiffener and scatter of strength is examined in connection with fatigue resistance.

Low‐cycle fatigue tests were conducted for X‐type welded tubular joint specimens with three types of stiffeners. The test data are arranged in the form of total plastic work, total strain, and the S‐N curve; and the relationship between type of stiffener and scatter of strength is examined in connection with fatigue resistance.