Abstract: A space frame structure comprises an upper rectangular grid of structural members, a lower grid of structural members and interconnecting members joining the grids together to form a space frame. A concrete layer is poured on to shuttering carried by lower flanges of the upper grid members with these upper members partially embedded in the concrete to form a composite upper layer. At least two upper members of each grid rectangle have upper flanges embedded in the concrete, and at least one of the members from the same grid rectangle is without an upper flange to facilitate installation of the shuttering.

Abstract: A space frame structure has parallel spaced lower and upper sub-frames joined by interconnecting members, each sub-frame comprising a multiplicity of members connected in a grid, and a concrete layer secured to the upper sub-frame, wherein the concrete layer embeds the grid members of the upper sub-frame in the layer to form a composite upper sub-structure. Preferably the structure comprises permanent shuttering supported on the grid members of the upper sub-frame within the depth of the upper sub-frame, the concrete layer being laid on the shuttering to a depth sufficient to embed all of the grid members above the shuttering in the layer.