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In counterfort type retaining walls<br>i) the vertical slab is designed as a continuous slab<br>ii) the heel slab is designed as a continuous slab<br>iii) the vertical slab is designed as a cantilever<br>iv) the heel slab is designed as a cantilever<br>The correct answer is
A
(i) and (ii)
B
(i) and (iv)
C
(ii) and (iii)
D
(iii) and (iv)
Correct Answer:
(i) and (ii)
In the design of a front counterfort in a counterfort retaining wall, the main reinforcement is provided on
i) bottom face near counterfort
ii) top face near counterfort
iii) bottom face near centre of span
iv) top face near centre of span
The correct answer is
A
Only (i)
B
Only (ii)
C
Both (i) and (iv)
D
Both (ii) and (iii)
In a counterfort retaining wall, the main reinforcement is provided on the
i) bottom face in front counterfort
ii) inclined face in front counterfort
iii) bottom face in back counterfort
iv) inclined face in back counterEort
The correct answer is
A
(i) and (ii),
B
(ii) and (iii)
C
(i) and (iv)
D
(iii) and (iv)
In a counterfort retaining wall, the main reinforcement in the stem at mid span is provided on
A
Front face only
B
Inner face only
C
Both front face and inner face
D
None of the above
In counterfort retaining walls, the main reinforcement in the stem at support is
A
Not provided
B
Provided only on inner face
C
Provided only on front face
D
Provided both on inner and front faces
If ‘H’ is the overall height of a retaining wall retaining a surcharge, the width of the base slab usually provided, is
A
0.3 H
B
0.4 H
C
0.5 H
D
0.7 H
The design of heel slab of a retaining wall is based on the maximum bending moment due to:
A
Its own weight
B
Weight of the soil above it
C
Load of the surcharge, if any
D
All the above
In a cantilever retaining wall without a heel slab
A
Thickness of the stem is kept same throughout
B
Base slab is made 10 cm thicker than the stem
C
Width of the base slab is kept 0.7 time the total height of the wall
D
All the above
Stud switches are of 2 types – loose heel and fixed heel type.
A
True
B
False
A plane slab of thickness 60 cm is made of a material of thermal conductivity k = 17.45 W/m K. Let us assume that one side of the slab absorbs a net amount of radiant energy at the rate q = 530.5 watt/m2. If the other face of the slab is at a constant temperature t2 = 38 degree Celsius. Comment on the temperature with respect to the slab?
A
87.5 degree Celsius
B
32 degree Celsius
C
47.08 degree Celsius
D
32.87 degree Celsius
In case the factor of safety against sliding is less than 1.5, a portion of slab is constructed downwards at the end of the heel slab, which is known as
A
A key
B
A cut-off wall
C
A rib
D
All the above