Abstract
This is an introductory paper outlining the background to the plastic design of two-way spanning systems such as (some) space frames, bridge decks and steelwork connection components. The approach draws on the now well-established British (Baker) methods for the plastic design of one-way systems and upon the Scandinavian (Johansen, Hillerborg) proposals for two-way systems. What emerges is a new concept for a stress-resultant to be called a ‘Bimoment’. Bimoments seem to have a significance for some two-way systems comparable to the significance that ordinary bending moments have for one-way systems. Thus they do permit comprehensive direct equilibrium relationship between total loads and stresses for portions of plates or grillages which are large in one or both directions.
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