Abstract
The American Welding Society (AWS) rules are compared with the International Institute of Welding 〈IIW〉 rules for circular tubular connections because of the differences between the two. Subjects discussed include: accuracy in prediction, effects of size and material properties, premature failures due to local buckling of braces and due to fracture at weld toes, and applications to multiplanar connections, focusing on the ultimate behaviour and design of K-connections under axial brace loading for the sake of conciseness. One important conclusion is that the AWS rules lead to relatively unsafe design for K and KK-connections with stocky chords. Suggestions to enhance the reliability of the AWS rules are made.
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