The design of heel slab of a retaining wall is based on the maximum bending moment due to:

In counterfort type retaining walls
i) the vertical slab is designed as a continuous slab
ii) the heel slab is designed as a continuous slab
iii) the vertical slab is designed as a cantilever
iv) the heel slab is designed as a cantilever
The correct answer is

A

(i) and (ii)

B

(i) and (iv)

C

(ii) and (iii)

D

(iii) and (iv)

In counterfort type retaining wallsi) the vertical slab is designed as a continuous slabii) the heel slab is designed as a continuous slabiii) the vertical slab is designed as a cantileveriv) the heel slab is designed as a cantileverThe correct answer is

A

(i) and (ii)

B

(i) and (iv)

C

(ii) and (iii)

D

(iii) and (iv)

A reinforced concrete beam is subjected to 5 kNm bending moment due to dead load and 25 kNm bending moment due to live load. What should be the design bending moment for limit state of collapse?

A

30.0 kN.m

B

34.5 kN.m

C

45.0 kN.m

D

50.0 kN.m

If W is total load per unit area on a panel, D is the diameter of the column head, L is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the design of the span of a square flat slab, should not be less than

A

$$\frac{{{\text{WL}}}}{{12}}{\left( {{\text{L}} - \frac{{2{\text{D}}}}{3}} \right)^2}$$

B

$$\frac{{{\text{WL}}}}{{10}}{\left( {{\text{L}} + \frac{{2{\text{D}}}}{3}} \right)^2}$$

C

$$\frac{{{\text{WL}}}}{{10}}{\left( {{\text{L}} - \frac{{2{\text{D}}}}{3}} \right)^2}$$

D

$$\frac{{{\text{WL}}}}{{12}}{\left( {{\text{L}} - \frac{{\text{D}}}{3}} \right)^2}$$

The main reinforcement in the toe of a T-shaped R.C. retaining wall is provided on
i) top face parallel to the wall
ii) top face perpendicular to the wall
iii) bottom face parallel to the wall
iv) bottom face perpendicular to the wall
The correct answer is

A

Only (ii) is correct

B

(i) and (ii) are correct

C

(iii) and (iv) are correct

D

Only (iv) is correct

Which of the following statements are correct regarding Westergard’s concept for temperature stresses? 1. During the day, the top of the pavement slab gets heated under the sunlight when the bottom of the slab becomes hot 2. During summer season as the mean temperature of the slab increases, the concrete pavement expands towards the expansion joints 3. Due to frictional force at the interface, compressive stress is developed at the bottom of the slab as it tends to expand.

A

1 and 2 only

B

2 and 3 only

C

1 and 3 only

D

1, 2 and 3

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

Which of the following are the general design requirements of retaining wall? 1. The factor of safety against sliding should be at least 1.5 2. The factor of safety against over-turning should be at least 2.0 3. The bearing pressure at toe should be less than the bearing capacity of the soil 4. The length of retaining wall to be cast in one go should not exceed 10 m otherwise cracks may develop

A

1, 2 and 3 only

B

1, 3 and 4 only

C

1, 2 and 4 only

D

2, 3 and 4 only

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

Calculate bending moment of dead load given total load = 14n/mm2, Dead load bending moment dead weight of slab = 12kn/m2, dead weight of w.c = 1.76kn/m2, span length is 10.4m?

A

120knm

B

130knm

C

190knm

D

160knm

The design of heel slab of a retaining wall is based on the maximum bending moment due to:

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