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VTU Civil Engineering (Semester 5)
Design of RCC Structural Elements
June 2014
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) Explain balanced section, under reinforced section and over reinforced section with the help of sketches in limit state RCC design.
4 M
1 (b) Derive the expression for stress block parameters, compressive force Cu=0.36 fek Xu and its depth Y =0.42 Xu from top.
8 M
1 (c) Obtain the expression for Max depth of neutral axis, limiting percentages of steel and limiting moment for rectangular RC section for M20 concrete and Fe415 steel.
8 M

2 (a) A single reinforced cone. Beam 250×450 mm deep up to the centre of reinforcement is reinforced with 3-16 mm dia at an effective over 50 mm. Effective span 6m. M20 cone and Fe415 steel. Determine the central point load that can be supported in addition to the self-weight.
8 M
2 (b) A doubly reinforced concrete rectangular beam 250mm × 500 mm is required to support a load of 40 kN/m including self wt. Effective span 5m, effective cover 50mm. M20 cone. Fe415 steel. Find the steel required for flexure and shear.
12 M

3 (a) A T-beam reinforced concrete beam having flange width 1200mm flange thickness 100mm E.depth 600mm web 300 mm. Find steel to resist an ultimate moment of 550 kNm. Adopt M15 cone and Fe415 steel.
10 M
3 (b) A doubly reinforced concrete beam having rectangular section 250mm×500mm is reinforced with 2-12 mm di in compression 4-20mm dia in tension. Effective cover 40mm. E.span 5m. Find ultimate moment capacity. Adopt M20 cone, and Fe415 steel.
10 M

4 (a) A hall 16 × 6m is provided with T-beam and slab. T beams are spaced 4m c/c slab thickness is 120mm, L Load 5 kN/m2 including self wt. Design intermediate T beam. M20 cone, and Fe415 steel. Assume bearing of 500mm. Check the beam for deflection and development length at support.
12 M
4 (b) Design a beam 300mm × 600mm to support Mu=115 kNm; Vu=95 k/Nm; Tu=45 kN/m. Use M15 cone and Fe415 steel. Assume effective cover 37.5 mm.
8 M

5 Design a two way slab 5m × 6m live load 3 kn/m2. M20 concrete Fe415 steel. Also check for bond length and shear. Assume corners are held down, bearing 300 mm.
20 M

6 (a) Design RCC column to support ultimate load of 1800 kN. Effective length 1.85 m, M20 cone and Fe415 steel.
10 M
6 (b) Design a column 450 × 450 mm to support a load of Pu=2500 kN; Mu=180 kNm. Adopt M25 cone Fe415 steel. Assume bars on all the four sides. Effective cover 67.5 mm.
10 M

7 Design a rectangular isolated footing of uniform thickness for a column 400×600 mm to support a load of 600 kN SBC of soil 120 kN/m2. Adopt M20 cone Fe415 steel. Take the size of the footing 2.5m×2.3m. Also check the requirements of one-way shear, two-way shear bond and transfer of load at column base.
20 M

8 Design a stair for an office building for the plan shown in Fig. Q8. Rise 150 mm tread 250mm bearing 400 mm. M20 cone and Fe415.
Sketch the details of reinforcement for span AB and CD.

20 M

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