Abstract: A load bearing floor or roof member is in the form of a flat plank member. It has flat major upper and lower walls and flat minor side walls. It is a rigid, hollow, integral structure of fibre reinforced plastics material, with a rigid plastics foam filling. In each minor side wall is an integral undercut channel which is shaped to receive slidably a connector portion of a connector member, which connector portion is of head and neck shaped cross section.
Abstract: A structural panel (FIG. 1) for use for example in bridge decking has spaced steel sheets (2A, 2B) between which are corrugated stiffening members (3A) of glass fibre reinforced plastics material. The stiffening members (3A) are glued to the spaced sheets (2A, 2B). The voids (15) are filled with plastics foam (4). A strong structure results, in which fabrication costs and maintenance costs are reduced, by virtue of the absence of great lengths of fatigue failure-susceptible welds.