# Reinforced Concrete Structures–II

```Register Number
SATHYABAMA UNIVERSITY
(Established under section 3 of UGC Act, 1956)
Course &amp; Branch: B.E-P-CIVIL/CIVIL
Title of the Paper: Reinforced Concrete Structures–II Max. Marks: 80
Sub. Code: 620602-620PT501
Time: 3 Hours
Date: 10/11/2010
Session: AN
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PART - A
(10 X 2 = 20)
1.
State the difference between two way slab and Doubly reinforced
beam.
2.
Why are two way slabs not necessary to check against shear?
3.
Define Retaining Walls.
4.
State the Different types of Retaining Walls.
5.
Define Water Tank.
6.
State the Different types of Water Tanks.
7.
Define Bunkers.
8.
Define Silos.
9.
Define Staircases.
10. State the different types of Staircases.
PART – B
(5 x 12 = 60)
11. Design a simply supported roof slab for a room 10m x 3m in size
for a live load of 5kN/m. Use M15 grade concrete mix and mild
(or)
12. Design a flat slab without drop or column head. The slab is
supported on columns spaced at 4.5m c/c in both directions. Live
load may be taken as 4.5kN/m2. Column size is 400mm x 400mm
and storey height is 5m. Columns may be taken as fixed at their
foundation levels. Use M15 grade concrete mix and mild steel
13. Design a cantilever retaining wall to retain a level earth fill of
4.5m above ground level. The surcharge on the earth fill is
15kN/m2. The angle of repose of soil is 30, unit weight of soil is
16 15 kN/m3 coefficient of friction between soils and concrete is
0.6 and the safe bearing capacity of soil is 150kN/m3. Use M15
grade concrete mix and mild steel.
(or)
14. Design a counterfort retaining wall to retain earth 5 m above the
basement level. The density of the earth is 16000 N/m3 and the
angle of repose of soil is 30. The bearing capacity of the soil is
125kN/m2.
15. Design a circular tank resting on ground with flexible base tank
8m in diameter and 3.5 height. Use M20 grade concrete and
height yield strength deformed base.
(or)
16. Design an over head water tank for a capacity of 90,000 litres.
Top of the tank is uncovered and bottom slab is cast monolithic
with the walls. Use M20 grade concrete and high yield strength
deformed bars.
17. Design the side walls and hopper bottom of a 3m x 3m square
bunker to store 30 tones of coal. Density of coal is 9kN/m3 angle
of repose = 30. Adopt M15 grade concrete and ribbed for steel
Sketch the details of reinforced in the bunker.
(or)
18. A cylindrical silo has an internal diameter of 6m and 20m deep
(cylindrical portion) with a conical hopper bottom. The material
stored is wheat with density of 8kN/m3. The coefficient of
friction between wall and material is 0.444. The ratio of
horizontal to vertical pressure is 0.4, angle of repose = 25.
Design the reinforcement in side walls at hopper bottom adopt
M15 (ribbed steel). Use Janssen’s theory.
19. A dog legged staircase is to be provided for a building. The
vertical distance between floors in 3.3m. The space available is
2.5m x 5.0m. Design the staircase for a live load of 3kN/m2.
(or)
20. An open newel staircase is to be provided in a space of 4.5m x
3.5m. The height for which staircase is to be provided is 3.3m.
Design the staircase for a live load of 3.0kN/m2. Use M15 grade