Using the alternate design method, design (the dimension) of a 4m simply supported rectangular beam for flexure, when it will be subjected to a 25 kN/m dead load, excluding its own weight, and a live load of 30 kN/m, under the following conditions: concrete unit weight, Yc = 23.5 kN/m^3 fc' = 28 MPa fy = 420 MPa If db = 32 mm is used, how many bars are needed for its reinforcement?

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Q: 14" #3 stirrup 25" 4- #11

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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.