A floor system in a small building consists of wood planks supported by 2 in. (nominal width) joists spaced at distance s, measured from center to center (see the figure). The span length L of each joist is 10 ft, the spacing s of the joists is 14 in., and the allowable bending stress in the wood is 1,150 psi The uniform floor load is 120 lb/ ft, which includes an allowance for the weight of the floor system itself. Planks Joists (a) Calculate the required section modulus S for the joists. S- in. (b) Select a suitable joist size (surfaced lumber) from Appendix G, assuming that each joist may be represented as a simple beam carrying a uniform load. A 2x4 in. B. 2x6 in? C.2x8 in.? D. 2x10 in. E 2x12 in. Select a suitable joist size -Select- (C) What is the maximum floor load that can be applied to your final beam selection in part (a)? Ib ft

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Bars

In civil engineering, bars refer to steel reinforcement bars or rebars. These are structural members primarily used for reinforcement purposes in masonry works. A bar is characterized by its cross-sectional area, which is negligible compared to its length. Bars are usually manufactured by steel which is uniform throughout the length, or by meshing multiple steel wires. Other materials of the bar include carbon steel, glass fiber, carbon fiber, and basalt fiber. The reinforcing bars are coated with epoxy resins and other materials to enhance some of their properties including corrosion resistance.