According to Ching in his book Masonry arch utilize the compressive strength of brick and stone to span openings by transforming the vertical forces of a supported load into inclined components. We have different of Archs one is the Roman Arch, Gothic Arch and a Jack Arch. Wood joist floors are an essential subsystem of wood light frame construction. Joist span is related to magnitude of applied loads, species and grade of lumber used. Wood subflooring is the structural material that spans across floor joists, serves as a working platform during construction and provide a base for the finish flooring. It includes Panel subfloor, Underlayment and or even combined Subfloor and Underlayment. Steel Beams is more structurally efficient wide flange W shapes have largely superseded the classic I beamS shapes it also can be in a C shape as well. Metal decking is corrugated to increase its stiffness and spanning capability. There are three major types f metal decking Form Decking, Composite Decking and Cellular Decking. Reinforced concrete beams are designed to act together with longitudinal and web reinforcement in resisting applied forces. The top and bottom bars are longitudinal bars serving as tension and the part in the middle is surving as compression.