Effects of Initial Imperfection due to Welding on Rigidity and Strength of Triangular Corner Bracket

概要

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The function of corner bracket is considered to reduce the stress concentration at the corner of main members, to increase the rigidity of the conjunction, etc.. In the case where the size of the bracket is of the same order of magnitude as the main members, its contribution to the strength can be expected to a certain extent. In this study, the buckling, and ultimate strength and rigidity of triangular corner bracket is theoretically and experimentally investigated with consideration of the effects of welding residual stresses and deformation, and reinforcement with stiffener. For theoretical analyses, such as elastic-plastic large deflection analysis, elastic-plastic thermal stress analysis, etc., the methods which were developed by the authors with the aid of the finite element method are applied. Initial deflection of the bracket reduces the rigidity and ultimate strength as observed in the case of square plates under compression. Welding residual stresses in the bracket are not self-balanced due to the existence of the main menbers, and are mostly in tension. The tensile residual stresses increase the strength of the bracket. Stiffener provided along the free edge also increases the strength.
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