An axially loaded rectangular tied column is to be designed for the following service loads. Dead Load = 1500 kN, Live Load = 850 kN, with its required strength, U=1.2 DL+1.6 LL. The effective cover to centroid of reinforcement is 70 mm. The concrete strength, fc= 28 MPa, while the steel yield strength fy=415 MPa. If the square column section has a side of 450 mm and vertical reinforcements consists of 16 bars, detemine the diameter of vertical bars if the required minimum steel ratio is 3%? If the column has a circular section, detemine the required minimum diameter if it is reinforced with 8- 25 mm diameter bars. a) b)

5. The beam shown is reinforced for positive moment with three epoxy-coated #11 bars. The bars terminate at the center of the supports. Neglecting beam weight (concentrated loads are very heavy), determine if the required development length is satisfied. Assume As required = 4.55in², 2 in. clear cover on all sides of the longitudinal reinforcement, normal weight concrete, #3 stirrups @12 in o.c., f'c = 5000 psi and fy = 60,000 psi. 8 ft | Pu 20 ft Pu 8 ft ge2 of 56 30 in b=14in. ed 5/15/2020 As = 3-#11

A reinforced concrete beam that is 375 mm wide and 500mm deep must resist a service live load moment of 250 kN-m and a service dead load moment of 150 kN-m. Use f'c-21 MPa and fy=415 MPa. The effective concrete cover is 65mm (to the centroid of reinforcements). 1. Determine the area of compression steel reinforcement (If required. Answer O if not) in mm² 2. Determine the minimum number of 25 mm diameter bars to be provided to satisfy the demand ultimate moment 3. Determine the maximum number of 25 mm diameter bars to be provided to have a tension controlled section Answer 1: 2403.21 correct answer: Answer 2: 9.00 Answer 3: 8.00

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