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VTU Civil Engineering (Semester 5)
Design of RCC Structural Elements
December 2016
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1(a) What are the different loads to considered in the design of an reinforced concrete element?
6 M
1(b) Explain the philosophy and principles of limit state method of design.
10 M
1(c) Explain the necessity of adopting partial safety factors for loads and material strength.
4 M

2(a) A single reinforced concrete beam 250×450 mm deep upto the centre of reinforcement is reinforced with 3-16 mm dia at an effective cover 50 mm, effective span 6 m, M20 concrete and Fe415 steel. Determine the central point load that can be supported in addition to the self weight.
10 M
2(b) Determine the moment of resistance of a T-beam for the following data: Breadth of the flange=740 mm; Effective depth= 400mm; Breadth of the web =240 mm; Area of steel = 5 -20; Depth of flange = 110 mm; Adopt M20 grade concrete and Fe415 grade steel.
10 M

3(a) What are the factors affecting the short term and long term deflections?
6 M
3(b) A singly reinforced rectangualar beam 360mm×580mm in section is simply supported on a efffective span of 5.25 m. The steel reinforcement consists of 6#20φ. The beam supports a udl of 25 kN/m (Dead load ) and 28 kN/m (live load). Assume M20 concrete and Fe415 steel. Check the design for short and long term deflection. Take ultimate strain in concrete due to shrinkage as 0.0003 and co-efficient of creep as unity. Effective cover may be taken a s 40 mm.
14 M

4 A Tee beam slab floor of an office comprises a slab 150 mm thick sapnning between ribs of 250 mm wide spaced at 3.2 m centre to centre. Clear span of beam = 7.70 m. The beam is 600 mm deep including slab and simply supported over walls of 300 mm wide. Live load on floor = 4 kN/m2, Floor and ceiling finish = 0.75 kN/m2. The beam also support a partition wall which transmits a load of 12 kN/m. Design on of the intermidate beam for flexure and shear. Also check for beam for deflection control. Assume effective cover = 50 mm M20 grade and Fe415 steel.
20 M

5(a) Distinguish between one way and two way slab.
4 M
5(b) Design a two way slab for a room of internal dimensions 4m×5m, supported on walls of 300 mm thickness with one corner held down. Two adjacent edges of the slab are discontinuous. Thickness of slab - 150 mm. The slab is to support a live load of 3kN/m2 and floor finish of 1 kN/m2. Sketch the reinforcement detail M20, Fe415 grade.
16 M

6(a) Design column 4 m long restrained in position and direction at both ends to carry n axial load of 1600 kN. Use M-20 concrete and Fe-415 grade steel . Sketch the inforcement details.
10 M
6(b) Design a R.C. column, 400mm square, to carry an ultimate load of 1000 kN and ultimate moment of 160kN-m. Use M20 concrete and Fe415 steel. Provide a cover of 40mm.
10 M

7 Design an isolated footing of uniform thickness for an RC square column, of size 500mm×500mm bearing a vertical load 600kN. The safe bearing capacity of the soil may be taken as 120 kN/m2. Use M-20 grade concrete and Fe415 grade steel. Sketch the reinforcement details.
20 M

8 Design a dog legged stair for an office building in a room measuring 2.8m×5.8m. Clear vertical distance between the floor is 3.6m. The width of flight is to be 1.25m. Assume imposed load of 3 kN/m2. Use M20 concrete and Fe415 grade steel. Assume that the stairs are supported of 230 mm at the outer edge of landing slabs. Sketch the reinforcement details.
20 M

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