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Posted Date: 01 May 2008 Posted By: Nitin Member Level: Platinum
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2007 Jawaharlal Nehru Technological University B.Tech BASIC REINFORCED CONCRETE DESIGN AND DRAWING (Civil Engineering) - Set 2 Question paper
III B.Tech I Semester Regular Examinations, November 2007 BASIC REINFORCED CONCRETE DESIGN AND DRAWING (Civil Engineering) Time: 3 hours Max Marks: 80 Answer any ONE Question from PART-A and any THREE Questions from PART-B Note:Assume suitable data whenever necessary Use of IS codes & Structural Tables is permitted ????? PART-A(Marks:32)
1. Design a simply supported rectangular beam to carry 35kN/m superimposed load over a span of 5m on 400mm wide supports. Use M20 grade concrete and FE 415 grade steel. Check the design for all necessary conditions. Draw to a suitable scale (a) Longitudinal section showing the reinforcement details. (b) The cross section of the beam at salient points, showing reinforcement details.
2. Design a simply supported roof slab for a room 4.5 m × 6 m measuring from inside. Thickness of the wall is 400 mm. The superimposed load exclusive of the self weight is 2.5 kN/m2 . The slab may be assumed to be simply supported on all four edges with corners held down. Use M20 mix and Fe 415 grade steel. (a) Draw the reinforcement of the slab in plan view. (b) Draw cross section of the slab including beams with reinforcement details.
PART-B (Marks:16x3=48)
3. A rectangular beam 25cm by 50 cm deep is reinforced with 2-14 mm bars in compression zone and 4-25mm bars in tension zone, each at an e?ective cover of 40mm. Determine the forces in compression, force of tension, cracking moment and moment of resistance assume (a) M20 concrete and Fe 415 grade steel (b) M25 concrete and Sail MA410 grade steel.
4. Design a rectangular section to resist a working bending moment of 30kNm. Use M20 concrete and Fe415 grades steel and assume suitable proportions.
5. Design a short column 40cm square in cross section to carry an axial load of 1000kN using (a) Mild steel (b) Fe 415 steel.
6. Design a footing for to a rectangular column 30cm × 45cm carrying an axial service load of 1000 kN. The net bearing capacity of soil is 120 kN/m2 . The unit weight of earth is 20 kN/m3 . Use sy = 415 N/mm2 and sck = 20 N/mm2 .
7. Explain the codal procedure for calculating de?ection due to creep. ?????
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