Abstract
Experimental comparison was performed between a cast steel joint and a welded circular hollow section joint in tubular truss structures to investigate their behaviour and difference. The cast steel joint was 70 mm thick, whereas the welded circular hollow section joint was fabricated using 30 mm thickness steel plate and stiffeners was set inside the chord member at the joint. The two joints were experimented under the same testing condition. Strain gauges were arranged to measure stress distributions in the joints. Finite element analysis was carried out to get more information on the behaviour of the joints. The experimental and numerical results showed both joints had enough strength to bear design loads. This means welded circular hollow section joints are also alternative approach for large and complicated joints of space trusses, besides cast steel joints.
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