A discussion is presented of the mechanics of the plate-like behaviour of certain space trusses that possess a single layer of chords. The web systems are formed out of the chord plane, and consideration is given to web systems that are placed on one or both sides of the chord plane. It is recognized that a torsional mode of behaviour is utilized for the double-layer web system for carrying transverse load. A combination of flexural and torsional modes is utilized for the single-layer system.
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