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VTU Civil Engineering (Semester 5)
Design of RCC Structural Elements
December 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) Define:
i) Characteristics strength
ii) Design strength
8 M
1 (b) Explain
i) Limit state of collapse
iii) Limit state of serviceability
4 M
1 (c) Derive the expression for stress block parameters for compressive force CuTEnsile force τu and locate its depth Y=0.42x, from top.
8 M

2 (a) An RCC beam 300 mm wide and 500 mm deep is reinforced with 4 bars of 16mm diameter. It is freely supported on an effective span of 6m. Determine the maximum permissible imposed service load. Assuming concrete grade M20 and Fe500 steel.
8 M
2 (b) A doubly reinforced beam section is 250mm wide and 450mm deep to the centre of the tensile reinforcement. It is reinforced with 2#16o as compression reinforcement at an effective over of 50 mm and 4#25ϕ as tensile steel. Using M15 concrete and Fe250 steel. Calculate the ultimate moment of resistance of the beam section.
12 M

3 (a) What are the factors affecting the short term and long term deflections?
6 M
3 (b) A singly reinforced rectangular beam 360mm × 580mm in section, is simply supported on a effective span of 5.25m. The steel reinforcement consist 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 deflections. Take ultimate strain in concrete due to shrinkage as 0.0003 and coefficient of creep as unity. Effective cover may be taken as 40 mm.
14 M

4 A hall measuring 14m×6m beams are spaced at 3.5 m C/C. The thickness of the wall being 300 mm. Thickness of the slab is 150mm. Live load of slab is 5 kN/m2. The web (rib) width of the beam shall be taken as 300 mm. Design an intermediate T-beam. Using M15 concrete and Fe415 grade steel. Sketch the reinforcement details.
20 M

5 Design a slab for a room 5m×10m live load 4 kN/m2. Use M20 concrete and Fe415 steel. Also check for bond length deflection and shear. Assume comers are held down, bearing 300mm. Sketch the reinforcement details.
20 M

6 (a) Design a RCC column (400 × 400)mm to carry an ultimate load of 1000 kN and eccentricity 160mm. Use M25 grade concrete and Fe415 grade steel. Sketch the reinforcement details.
10 M
6 (b) A 3 m height column is effectively held in position at both ends and restrained against rotation at one end. Design the column to carry a factored axial load of 3000 kN. Use M20 concrete and Fe415 steel. Sketch the reinforcement details.
10 M

7 Design a footing for a column carrying an axial load of 800 kN. The SBC of soil as 200 kN/m2. Use M20 mix and Fe415 steel. The column has 500mm × 500mm cross section.
20 M

8 Design dog legged staircase for a stair hall (4.75×3.1)m. Take rise and tread of steps as 150mm and 250mm respectively. Width of stairs 1.5m. Take live load 5 kN/m2 and finishes 0.75 kN/m2 . Use M20 Concrete and Fe415 steel. Draw a neat sketch of reinforcement details.
20 M

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