CE 6505 DESIGN OF REINFORCED CONCRETE ELEMENTS, Third year, Department of Civil Engineering, Model Exam Questions

Answer ALL Questions PART A – (10 x 2 = 20 Mark )
1) Define modular ratio?
2) Differentiate b/w one way &two way slab?
3) Assumptions for limit state of collapse?
4) Differentiate b/w under reinforced &over reinforced section?
5) What is formula used to find the spacing of inclined stirrups?
6) What is the importance of anchorage value of bonds?
7) Differentiate primary &secondary torsion?
8) Define bond & anchorage?
9) Why the dowel bars are provided in footing?
10) Define footing & types of footing?

PART-B (5 X 16=80 Marks)
11) a) A reinforced concrete beam is supported on two walls 750 mm thick spaced at clear distance of
6m. The beam carries a super imposed load of 9.8 KN/M. Using M20 grade and FE415 bars. Design the
beam section.
(OR)
      b) A simply supported slab has clear span 2.1 m supported on wall 400 mm thick along the edges live
load 4KN/m2, floor finish 0.6 KN/m2. Design the slab use M20 grade & FE415 bars.
12) a) A T-beam slab floor of an office comprises of a slab 150 mm thick spanning b/w ribs spaced at
 3m centres. The effective span of the beam is 8 m. Live load on floor is 4 KN/m2.Using M20 grade and
FE415 bars.Design one of the intermediate T-beams.Use limit state method.
(OR)
b)Design a two way slab for an office floor to shout the following data.Size of floor 4mx6m,live
load 4KN/m2,floor finish 1KN/m2,edge conditions two adjacent edges discontinuous materials.Using
M20 grade and FE415 bars.
13) a)A RCC section of 200 x 400mm is subjected to the following data.i)factored forces, the torsional
moment is 2.5KN/m and transverse shear of 60 KN.Use M25 grade & FE415 bars.Determine the
reinforced required according IS456 provision.Use follows.
Overalldepth=400 mm
Effective depth=350 mm
 b1=150 mm
 d1=300 mm
(OR)
b)Design the rectangular beam section of 250 mm width and 500 mm overall depth subjected to
ultimate values of BM of 40 KNm, Shear force of 40 KN, torsional moment 30 KNm.Adopt effective cover
50 mm.Use M20 grade & FE415 bars.
14) a)Design reinforcement in a column of size 400 x 600 mm subjected an axially working load of
2000KN. The column has unsupported length of 3m braced agains side swayin both directions.
Use M20 grade & FE415 bars.
(OR)
       b)Design reinforcement in a circular  column of diameter 400 mm with helical reinforcement to
support the factor load of 1500 KN. The column has an unsupported length  of 3m and is braced against
side sway.Use M20 grade & FE415 bars.
15) a)Design a reinforced concrete footing for a rectangular column of section 300 x 500 mm supporting
an axial load of 1500 KN . The safe bearing capacity of the soil is 185 KN/m2.Use M20 grade & FE415
bars.
(OR)
     b)Design a reinforced concrete footing for a rectangular column of section 400 x 400 mm supporting
an axial load of 2000 KN . The safe bearing capacity of the soil is 120 KN/m2.Angle of repose is 30
degree.Use M20 grade & FE415 bars.