Floor and roof structures for buildings

摘要

A horizontal floor or roof structure having a plurality of spaced parallel joists each joist having a vertical web with upper and lower flanges extending from the web. Each flange has a free edge with a tubular bead extending along each free edge and having an elliptical cross-section wherein the minor axis is at least 20% of the major axis. A floor or roof member is supported over said metal joist. A preferred method of forming a horizontal reinforced concrete wall structure for a building includes mounting a wire mesh material over the upper flanges of the joists, and pouring concrete in a flowing condition onto the concrete forms over the mesh material and over the upper flanges of the joists so that curing of the concrete provides a horizontal reinforced composite concrete wall structure.