The initial design of a simply supported beam is shown below. The architect requested the engineer to reduce beam depth by 100 mm to accommodate the client’s preferred celling height. Use f’c = 28 MPa, fy = 415 MPa, and fyt = 275 MPa. Clear cover is 40 mm. Analyze as singly reinforced beam only. a. How many additional ɸ16 tensile bars are required? b. What is the new spacing of stirrups near the end in mm? Round your answer to nearest safe 25 mm

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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.