Problem No.02: Determine the required number of negative reinforcement using 25mm for the beam loaded as shown. Use f'c-24.15 MPa and grade 40 reinforcing bars, 10mmo stirrups, the beam is exposed to weather with concrete cover of 50mm. The beam is limited to 300x500mm. Unit weight of concrete = 24kN/m³. Assume p based on 0.005 steel strain for single reinforced rectangular beam.

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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.