ANNA UNIVERSITY: CHENNAI – 600 025
B.E./ B.Tech. DEGREE EXAMINATIONS, NOV/DEC. 2018
CE 6711- COMPUTER AIDED DESIGN & DRAFTING LABORATORY
Seventh semester
Regulation 2013
Duration: 3Hrs
Maximum Marks: 100
1. Design a cantilever retaining wall to retain an earth embankment of 4 m height above from
level. The density of the earth is 18 kN/m3, and its angle of repose is 30°. The earth
embankment is horizontal at top. The safe bearing capacity of the soil is 200 kN/m2, and the
co- efficient of friction between the soil and concrete is 0.5. Adopt M20 grade concrete and
Fe 415 HYSD bars.
(100)
2. Design a cantilever retaining wall to retain an earth embankment 5m height. Level of
earth retained is horizontal. Angle of repose of earth retained is 30º. Density of earth
retained is 18 kN/m3. The safe bearing capacity of soil is taken as 200 kN/m2 and the
coefficient of friction between soil and concrete is 0.5.Assuming the thickness of
stem and base slab as 300 mm, calculate the base slab dimensions for stability
considerations. Adopt M20 grade concrete and Fe 415 HYSD bars.
(100)
3. Design a counterfort retaining wall using the following details.
Height of the wall above the ground level = 6m
Safe bearing capacity of soil at site = 160 kN/m2
Angle of internal friction = 33°
Density of soil = 16 kN/m3
Spacing of counterfort = 3m
Adopt M20 grade concrete and Fe 415 HYSD bars.
(100)
4. A counterforts retaining wall retains earth (with horizontal fill) to a height of 8m
from the top of the base slab. The counterforts are spaced at 3 m c/c. co efficient of
internal friction and density of earth retained are 30 º and 18 kN/m3 respectively.
Design an interior panel of the stem between counterforts.The safe bearing capacity
of soil is taken as 200 kN/m2 and the coefficient of friction between soil and
concrete is 0.5. Assume the thickness of the counterforts = 300 mm.Adopt M20
grade concrete and Fe 415 HYSD bars.
(100)
5. Design an RCC circular tank resting on ground with a flexible base and a spherical dome
for a capacity of 500000 liters. The depth of storage is to be 4m. And free board is
200mm. Materials used are M20 grade concrete and Fe 415 HYSD bars.Draw the following
(i) Cross section of the tank showing reinforcement details in dome, tank walls and
floor slabs.
(ii) Plan of the tank showing reinforcement details.
(100)
6. Design the side wall and base slab of the circular water tank for a capacity of 1.5 lakh
liters. Take modular ratio as 13. Tension in the concrete is permitted up to 0.5N/mm2.
Adopt M20 grade concrete and Fe 415 Steel.
(100)
7. Design a rectangular water tank resting on ground of size 5m x 4m x4m. Take water
pressure as 5 kN/m2. Draw plan & sectional elevation showing reinforcement
details.
(100)
8. A rectangular RCC water tank residing on ground with an open top is required to
store 80000 liters of water. The inside dimension of the tank may be taken as 6 m x
4m. The tank rests on walls on all four sides. Design the side walls of the tank. Using
M20 concrete and Fe 415 steel.
(100)
9. Design a deck slab of a bridge single lane , class A loading with the following details
Clear span = 3.5m
Loading IRC = Class A
Number of lane= single road width – 3.8m
Safety kerbs = 60 cm wide
Average thickness of wearing coat = 8 cm
Adopt M20 grade concrete and Fe 415 Steel.
(100)
10. Design a R.C.C Tee beam girder bridge to suit the following data:
Clear width of road way = 7.5 m
Span ( centre to centre of bearings ) = 16 m
Live load : I.R.C. Class AA or A whichever gives the worst effect
Average thickness of wearing coat = 80 mm
Material : M 25 grade concrete and Fe – 415 HYSD bars
Design the deck slab, main girder and cross girder and sketch the typical details of
reinforcements.
(100)
11. A road bridge deck consists of a reinforced concrete slab continuous over the beams
Spaced at 2m centres and cross girders spaced at 5m centers. Thickness of the wearing coat is
100mm.type of loading – I.R.C. class AA or whichever gives the worst effect. Adopt M-20
grade concrete and Fe – 415 HYSD bars. Design the deck slab and sketch the details of
reinforcements.
(100)
12. Design a welded plate girder of 30 m span to support a live load of 75 kN/m uniformly
distributed over the span. Adopt permissible stress as per IS 800. Draw the longitudinal elevation,
cross section and plane of girder.
(100)
13. Design a steel roof truss to suit the following data:
Span of the truss
= 10 m
Type of truss
= Fan-type
Roof cover
= Galvanized corrugated (GC) sheeting
Materials:
Rolled-steel angles
Spacing of roof trusses
= 4.5 m
Wind pressure pd
= 1.0 kN/m2
Draw the elevation of the roof truss and the details of joints.
(100)
14. Design an elevated cylindrical steel tank with hemispherical bottom for 1,60,000 litres capacity.
The tank has conical roof. The ring beam of the tank is at a height of 10 m from the ground level.
The tank is to be built at Delhi. Take fy = 250 N/mm2.
(100)
15. A cantilever type retaining has 5.5 m tall stem, it retains earth level with its top. The
soil weight 19 kN/m2 has angle of repose 30º, the safe bearing capacity of soil is 200
kN/m2. the coefficient of friction between base slab and soil is 0.6.
(100)
INTERNAL EXAMINER
EXTERNAL EXAMINER
ANNA UNIVERSITY: CHENNAI – 600 025
B.E./ B.Tech. DEGREE EXAMINATIONS, NOV/DEC. 2018
CE 6711- COMPUTER AIDED DESIGN & DRAFTING LABORATORY
Seventh semester
Regulation 2013
Allotment of mark
S.No
Description
Allocation of Marks
1
Design
40
2
Detailed drawing
50
3
Viva voce
10
Total
100