Design of One Way Slab

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. 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. 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. 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. 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. 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. 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