MODEL EXAMINATIONS: NOV/DEC 2015

(Regulation 2013)

Third Semester

CIVIL ENGINEERING

U13CET502: Design of Reinforced Concrete Elements

Time: Three Hours Maximum Marks: 100

Answer all the Questions:-

PART A (10 x 1 = 10 Marks)

1. The partial factor of safety for concrete as per IS:456-2000 is

a) 1.50 b) 1.15

c) 0.87 d) 0.446

2. The maximum area of compression reinforcement should not exceed………..

3. The maximum diameter of the reinforcement bars in R.C.C slab is

a) 12mm b) 10mm

c) Thickness of slab / 8 d) Thickness of slab / 10

4. The main reinforcement in cantilever beam is placed at …….

5. The spacing of vertical stirrups in a rectangular beam is

a) Maximum near the supports b) Minimum near the supports

c) Maximum near the centre d) Minimum near the centre

6. The condition for providing both longitudinal and transverse reinforcement in shear & torsion is..

7. Spacing of longitudinal bars measured along periphery of the column shall not exceed…

a) 3d b) 300mm

c) 5d d) 450mm

8. Due to increased load on the column ………… reinforcement is used.

9. A combined footing is provided when the

a) Bearing capacity of soil is less b) End column is near a property line

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c) Columns are very near d) All the above

10. The minimum depth of foundation at the edge is……

PART B (10 x 2 = 20 Marks)

11. Explain the terms balanced , under reinforced and over reinforced in bending .

12. Distinguish between the one-way and two-way slab.

13. What is meant by limit state method.

14. How to calculate Mu lim for flanged sections as per IS 456.

15. What is equivalent shear

16. What are the criteria for arriving the spacing of stirrups in torsion.

17. What is meant by development length.

18. How pitch and diameter of lateral ties obtained ?

19. What are the causes of failure of foundations ?

20. What is combined footing ?

PART C (5 x 14 = 70 Marks)Q.No. 21 is Compulsory21. A rectangular beam of 300 x 500mm is subjected a factored shear force of 80

kN, factored moment of 25 kNm and torsional moment of 6 kNm and it is

reinforced with 3 nos of 16mm dia. Design a beam for shear and torsion using

M20 & Fe415.

22. a) i) Determine the area of tension and compression steel if needed for a section of

250 x 600 mm with d’= 60mm carrying an load of 35 kN/m including self

weight over a span of 4m . Use M25 grade of concrete & Fe415 steel

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ii) Calculate the moment of resistance of the beam section of 300 x 500 mm having

4nos of 20mm dia at tension zone and 3nos of 16mm dia at compression zone

having a span of 6m with d’=40mm. Also find out the external load carrying

capacity. Use M20 grade of concrete & Fe415 steel

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(OR)

b) Discuss about the various methods of design 14

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23. a) Design a R.C.C slab for a room size 4.0 m x 5.0 m with discontinuous and

simply supported edges on all the sides with corners prevented from lifting to

support a live load of 4kN/m2 . Use M20 grade concrete &Fe415 HYSD bars.

(OR)

b) Design a R.C beam of a rectangular section 250mm x 500mm carrying a load of

40 kN/m including its self weight over a span of 5m . Use M20 grade concrete

&Fe415 HYSD bars.

24. a) Determine the size and reinforcement of a column required for an axial load of

2000kN. The unsupported length of column is 3m. Use M25 & Fe415 bars .

Design it for Circular column , Rectangular column , Circular column with

lateral ties & Circular column with helical reinforcement.

(OR)

b) Determine the reinforcement required in a column subjected to biaxial bending

of size 400 x 600mm , Factored load =1600 kN , factored moment = 120

kN,M20 & Fe415 steel and it is reinforced on all four sides

25. a)

(OR)

b)

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