Assignment-3

# Assignment-3 - CIVL 232 Design of Structural Concrete...

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Unformatted text preview: CIVL 232 Design of Structural Concrete Assignment 3: Doubly reinforced and flanged sections in bending Assigned: Thursday 9 March 2006 Due date: Thursday 16 March 2006 50 3.1 The section shown in Fig. 3-1is to resist an ultimate design moment of 330 kN-m. Determine the areas of reinforcement required. fcu = 30 N/mm2 and fy = 460 N/mm2. 550 A's As 250 Fig. 3-1 3.2 Determine the ultimate moment of resistance of the cross-section shown in Fig. 3-2. ′ fcu = 30 N/mm2 and fy = 460 N/mm2. (a) As = 2454 mm2 and As = 942 mm2; and (b) 50 As = 2454 mm2 and As′ = 1472 mm2. 500 A's As 300 Fig. 3-2 350 100 3.3 The T-section beam shown in Fig. 3-3 is required to resist a design ultimate moment of 180 kN-m. Calculate the area of reinforcement required, (a) without, and (b) with the assumption x = 0.5d (the code method). fcu = 30 N/mm2 and fy = 460 N/mm2. As 100 200 100 Fig. 3-3 d = 500 hf = 100 3.4 Determine the ultimate moment of resistance of the T-section shown in Fig. 3-4. (a) As = 4700 mm2; and (b) As = 5500 mm2. b = 1100 mm, bw = 350 mm, hf = 100 mm, d = 500 mm; fcu = 30 N/mm2 and fy = 460 N/mm2. 375 bw = 350 375 b = 1100 Fig. 3-4 8T25 150 350 150 900 75 75 650 150 3.5 Determine the ultimate moment of resistance of the cross-sections shown in Fig. 3-5. fcu = 30 N/mm2 and fy = 460 N/mm2. 650 Fig. 3-5 ...
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