Stress analysis of un-lapped rectangular hollow ‘k’ joints by the finite element method

Abstract

Finite element stress analysis relevant for the study of welded hollow rectangular ‘K’ Joints is presented. Thin shell theory and iso-parametric formulation are employed to obtain equilibrium equations. Thereafter, the effect of brace spacing is investigated by varying the spacing between the two braces and making computer runs. The results obtained for the present study show a gradual deterioration in strength as the spacing between the two braces is increased. The results of the present study indicate that even for rectangular hollow steel truss construction, the spacing between braces of the ‘K’ joints should be carefully selected so as to avoid overstressing the joints. Further more, the results of the present study show that lapped rectangular ‘K’ joints are stronger than un-lapped joints of same cross-sections. The results also provide a useful information for Engineers wishing to strengthen weak joints in trussed steel bridges as well as offshore structures to do so.

Keywords: Joints, analysis, stress, un-lapped, hollow, rectangular and fatigue