Design of One Way Slab

Q. The main reinforcement of a RC slab consists of 10 mm bars at 10 cm spacing. If it is desired to replace 10 mm bars by 12 mm bars, then the spacing of 12 mm bars should be

1. 12cm
2. 14 cm
3. 14.40cm
4. 16 cm

Q. The main reinforcement of a R.C. slab consists of 10 mm bars at 100 mm spacing, if it is desired to replace the 10 mm bars by 12 mm bars, then the spacing of 12 mm bars should be

1. 120mm
2. 140mm
3. 144mm
4. 160mm

Q. For the purpose of design as per IS:456, deflection of RC slab or beam is limited to

1. 0.2% of span
2. 0.25% of span
3. 0.4% of span
4. 0.45% of span

Q. Temperature and shrinkage steel is provided in reinforced concrete slabs because

1. It occupies larger area
2. Its thickness is less
3. It is a main structural element
4. It is a flexural member

Q. For a composite steel-beam and RCC-slab floor construction

1. the grade of concrete has to be M20 for the composite action to be satisfactory
2. the longitudinal reinforcement of the slab has to be welded to the beam to develop monollthicity
3. a notch is made in the slab to house the upper flange of the beam
4. shear connectors are provided to develop the composite action

Q.

What is torsional strength?

Q. Consider the following statements for prediction of yield lines in a reinforced concrete slab:
1. They represent the axis of rotation.
2. They will propagate outward from a point load.
3. They are straight lines between two intersecting planes.
4. They end at the boundary of the slab or at another yield line.
Which of these statements are correct?

1. 1, 2, 3 and 4
2. 1, 2, and 3
3. 1, 2 and 4
4. 2, 3 and 4

Q. What is the value of minimum reinforcement (in case of Fe 415) in a slab?

1. 0.1%
2. 0.12%
3. 0.15%
4. 0.2%

Q. As per codal provisions in two way slabs, the minimum mild steel reinforcement to be provided in the edge strip is

1. On the basis of minimum bending moment
2. Half of the area of steel provided in middle strip in the shorter span
3. Half of the area of steel provid d in middle strip in the longer span
4. Half of the area of steel provided in middle strip in the longer span

Q. A reinforced concrete rectangular slab is built-in (fixed) on three edges and the other edge is free. The possible yield line patterns for the slab subjected to a uniformly distributed load and reinforced isotropically are shown below as 1, 2, 3and 4.



Which of these correctly exhibits the yield line
pattern?

1. 1 or 3
2. 2 or 3
3. 1 or 2
4. 3 or 4

Q. Match List-I with List-II and select the correct answer using the codes given below the list:

A. Minimum percentage of tension reinforcement of RC beam

B. Minimum percentage of shear reinforcement of RC beam

C. Maximum allowable percentage of tension reinforcement of RC beam

D. Maximum allowable percentage of compression reinforcement of RC beam

List-II

1. 4

2. $\frac{85}{f_y}$

3. $\frac{40S_v}{f_{y}d}$

Codes:
A B C D

1. 2 1 3 1
2. 2 3 1 1
3. 1 3 1 2
4. 3 2 1 1

Q. A box girder section is subjected to loads as shown in the figure below. The critical section for shear in the bottom slab will occur at

1. D from the face of the wall
2. 'd' from the face of the wall
3. 'd/2' from the face of the wall
4. the face of the wall

Q. The specified span to depth ratios of beams satisfying the limits of vertical deflection are for spans up to 10 m.

1. For higher spans, these are to be modified by multiplying the ratios by (10/span in metres).

2. For higher spans, these are to be modified by multiplying the ratios by (span in metre/ 10).

3. They get further modified depending on area and type of tension reinforcement.

4. However, they do not change further with the area and type of compression reinforcement. Select the correct answer using the cod s given below:

1. 1 and 3
2. 2 and 3
3. 1 and 4
4. 2 and 4

Q. Match List-I (Support) with List-II (Shear Coefficients) and select the correct answer using the codes given below the lists

List-I
A. At end support, for imposed load (not fixed)
B. At inside support, next to end support, for
imposed load (fixed)
C. At end support, for dead load and (fixed)
imposed load
D. At all other interior supports (other than at 'B'),
for imposed load (fixed)

List-II
1. 0.5
2. 0.55
3. 0.60
4. 0.45
5. 0.4
Codes:
A B C D

1. 5 3 2 4
2. 4 2 5 1
3. 1 2 3 4
4. 5 3 2 1

Q. Consider the fallowing statements:

1. The minimum steel requirements of slabs are based on considerations of shrinkage an temperature effects alone, and not on strength.

2. Providing excessive reinforcement in beams can result in congestion, thereby adversely and compaction of concrete.

Which of the above statements is/are correct?

1. 1 only
2. 2 only
3. Both 1 and 2
4. Neither 1 nor 2

Q. For shorter storey height, cheaper form work and better lighting facilities, what is the recommended slab floor?

1. T beam and slab
2. Two way slab
3. Flat slab
4. Framed structure

Q. In reinforced brickwork slabs, the diameter of main reinforcement shall, preferably not exceed

1. 8 mm
2. 10 mm
3. 12 mm
4. 16 mm

Q. Design of one-way RC slabs for concentrated load is done by

1. using Pigeaud's moment coefficients
2. taking slab strip of unit width containing the load
3. taking slab strip of width effective in resisting the deflection
4. taking orthogonal slab strips of unit width containing the load