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Design of RC Structural Elements Question Paper - Jun 18 - Civil Engineering (Semester 5) - Visveswaraya Technological University (VTU)
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Design of RC Structural Elements - Jun 18
Civil Engineering (Semester 5)
Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
Module-1
1.a.
Differentiate between working stress method and limit state method of RCC design.
(5 marks)
00
2.b.
Define:
(3 marks)
00
1.Partial safety factor for load and materials.
2.Characteristic load
3.Characteristic strength
1.c.
A simply supported beam of rectangular section spanning over 6 m has a width of 300 mm and overall depth of 600 mm. The beam is reinforced with 4-25 mm bars on tension side. The beam is subjected to moment of 160 kNm. Check the beam for serviceability limit state of cracking. Assume M25 and Fe415.
(8 marks)
00
OR
2.a.
Derive the expression for stress block parameter for compresive force $C_{u}$, tensile force $T_{u}$ and locate the depth of neutral axis y = 0.42 $x_{u}$ from top of the beam.
(5 marks)
00
2.b.
Explain briefly under reinforced, over and balanced sections with sketch.
(3 marks)
00
2.c
A simply supported beam of rectangular section 250 mm wide by 450 mm overall depth is used over an effective span of 4 m, the beam is reinforced with 3 bars of 20 mm. Two hanger bars of 10 mm diameter are provided. The self weight of the beam is 4kN/m and service load is 10 kN/m. Assume M20, Fe415
(8 marks)
00
Compute: 1. Short teem deflection 2. Long term deflection
Module-2
3.a.
Define simply and doubly reinforced beams list the situations when they are adopted.
(5 marks)
00
3.b.
Determine moment of resistance of T-beam for the following data:
Width of the flange = 2500 mm, effective depth = 800 mm, width of web = 300 mm, number of bars = 8 of 25 diameter, depth of flange = 150 mm.
Assume M20 and Fe415 steel.
(11 marks)
00
OR
4.a.
A simply reinforced concrete beam 230 $\times$ 450 mm deep upto the centre of reinforcement is reinforced with 3-16 mm bars with an effective cover of 50 mm. The effective span of the beam is 6 m. Determine the central point load that the beam can carry excluding self weight. Assume M20 and Fe415.
(8 marks)
00
4.b.
A doubly reinforced beam is 250 mm wide and 450 mm deep to the centre of tensile reinforcement. It is reinforced with 2-16 compression reinforcement and 4-25 as tensile reinforcement. Calculate the ultimate moment of resistance of the beam. Assume M15 and Fe250 steel.
(8 marks)
00
Module-3
5.a.
Design a reinforced concrete beam of rectangular section using the following data:
Effective span = 5 m . width of the beam = 250 mm, overall depth = 500 mm. D.L + L.L = 40 kN/m, effective cover = 50 mm.
(7 marks)
00
5.b.
A T-beam slab floor of an office comprises of a slab 150 mm thick resting on beams 3 m c/c. The effective span of beam is 8 m. Assume live load on the floor as $4 kN/m^2$. Use M20 and Fe415. Design one of the intermidate T beams.
(9 marks)
00
OR
6.a
A reinforced concrete beam over an effective span 5 m carries a load of 8 kN/m inclusive of self weight. Assume M20 and Fe415. Design the beam to satisfy the collapse and serviceability limit states.
(8 marks)
00
6.b.
A cantilever beam of 4 m span carries a load of 40 kN/m. The width of the beam is 230 mm. Design the beam for flexure and sher. Sketch the details of reinforcement. Assume M20 and Fe415.
(8 marks)
00
Module-4
7.a.
Distinguish between one way slab and two way slab.
(4 marks)
00
7.b.
Explain the importance of bond, anchorage length.
(4 marks)
00
7.c.
Design a two way slab for an office floor of 3.5 $\times$ 4.5 m simply supported on all sides with corners prevented from lifting. Take live load of $4 kN/m^2$. Assume M20 and Fe415.
(8 marks)
00
OR
8.a.
What is development length ? Write the expression for development length.
(4 marks)
00
8.b.
Design one of the flights of dog logged stair case spanning between landing beams using the following data
Number of steps in the flight = 10, Tread = 300 mm, Rise = 120 mm, Width of landing beams =300 mm.
(12 marks)
00
Assume M20 and Fe415.
Module-5
9.a.
What is the role of transverse reinforcement in columns? What are the codal provisions of design the transverse reinforcement?
(5 marks)
00
9.b.
Design the reinforcement for a column of size 300 $\times$ 500 mm to support a factored load of 500 kN and a factored moment of 200 kNm. Assume M20 and Fe415. Sketch the reinforcement details
(11 marks)
00
OR
10.a.
Explain the difference between short columns and long columns. Why is reduction coefficient applied to long column?
(4 marks)
00
10.b.
Design a isolated forting for a rectangular column of 300 mm $\times $ 500 mm supporting an axial load of 1500 kN factored. Assume SBC of soil of $185 kN/m^2$. Use M20 and Fe415. Sketch the reinforcement and perform the necessary checks.
(12 marks)
00
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