A reinforced concrete beam of rectangular section has a width of 300 mm and effective depth of 450 mm to the centroid of the tension reinforcements. The beam is reinforced for tension with 6 – 32 mm diameter bars placed in two layers with the outer bar layer having a depth of 478 mm to the centroid of the bar. The section is provided with 2- 28 mm diameter compression reinforcements having a total bar covering of 65 mm Use fe = 34.5 MPa and fy = 415 MPa. Neglect the concrete displaced by the compression reinforcements and assume that the compression steel yields. Ūse the 2010 NSCP. a) Calculate the balanced steel ratio if the beam is singly reinforced

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Q: simply supported beam is reinforced with 4 – 28 mm ø at the bottom and 2 – 28 mm ø at the top of the…

A: Given  fc’ = 30 MPa, fy = 415 MPa. Balanced steel ratio ρb = 0.031 Reduction factor= 0.9

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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.