Question 1 (30 marks); A rectangular beam has the dimensions b = 350 mm, d 700 mm. The concrete cylinder strength f= 28 MPa, the steel reinforcement bars has yield strength fy 420 MPa. a) It is required to calculate the reinforcements for beam with a limited depth of 700 mm under ultimate design moments of M, 800 kN.m. (10 marks) b) Check whether the section will be designed as 409 p b=350 mm d = 700 mm singly or doubly. Use steel bars of diameter; 28mm, Area = 616 mm²/bar for tension reinforcement, (5 marks) c) Add 3 bars of diameter = 20mm, total area = 942mm² as a compression steel, calculate the new design moment M, for the new doubly reinforced section. (15 marks) Question 2: (10 marks) Architectural considerations limit the height of a 6m long simple beam to 400 mm and the width to 300 mm. the following loads and materials properties are given: W 11kN/m, W 24kN/m, The concrete cylinder strength f=35 MPa, the yield point of the steel fy = 420 MPa. Determine the reinforcement for the beam. Assume 628 (Area 616 mm²/bar) with one layer arrangement, concrete cover to reinforcement center = 60mm Question 3: (10 marks) For T-reinforced concrete section beam, the concrete cylinder strength f=28 MPa, the steel reinforcement bars has yield strength fy = 420 MPa. Determine the ACI design moment capacity M. Perform necessary checks. 1800 6018