# JNTU Kakinada B-Tech 3-1 RT31013 I DESIGN AND DRAWING OF REINFORCED CONCRETE STRUCTURES R13 April 2018 Question Paper

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Code No: RT31013
III B. Tech I Semester Supplementary Examinations, May-2018
DESIGN AND DRAWING OF REINFORCED CONCRETE STRUCTURES (Civil Engineering)Time: 3 hours Max. Marks: 70
Answer any ONE Question from Part ? A and any THREE Questions from Part ? B
Use of IS: 456-2000 and design charts from SP-16 is allowed.
For all designs adopt Limit State Method
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PART ?A
1 Design the reinforcements in a circular column of diameter 350mm with helical
ties to support a factored load of 1600kN. The column has an unsupported length
of 3.5m and is braced against side sway. Adopt M-25 grade concrete and Fe-500
[28M]
2 Design a combined footing for the two columns of a multistory building. The
columns of size 400mm?400mm transmit a working load of 800kN each and they
are spaced at 5m centers. The safe bearing capacity of soil at site is 200kN/m
2
.
reinforcements in the combined footing.
[28M]
PART ?B
3 a) Explain the terms: neutral axis depth factor, modular ratio, lever arm coefficient
and moment of resistance with respect to reinforced concrete sections.
[7M]
b) What are the various serviceability states and why they should be considered in
design?
[7M]
4 Determine the moment of resistance of a tee-beam having the following section
properties:
Effective width of flange=2500mm
Depth of flange=150mm
Width of rib=300mm
Effective depth=800mm
Area of steel:6 bars of 25mm diameter
Fe-415 HYSD bars.
[14M]
5 A simply supported reinforced concrete beam of rectangular section 250mm wide
by 450mm overall depth is used over an effective span of 4m. The beam is
reinforced with 3 bars of 20mm diameter Fe-415 HYSD grade steel at an effective
depth of 400mm. Two hanger bars of 10mm diameter are provided. The self
concrete, compute:
i) The short term deflection
ii)The long term deflection according to the provisions of the IS:456-2000 code.

1 of 2
[14M]
R13
SET – 1
|”|”|||”|”’|||’|

Code No: RT31013
III B. Tech I Semester Supplementary Examinations, May-2018
DESIGN AND DRAWING OF REINFORCED CONCRETE STRUCTURES (Civil Engineering)Time: 3 hours Max. Marks: 70
Answer any ONE Question from Part ? A and any THREE Questions from Part ? B
Use of IS: 456-2000 and design charts from SP-16 is allowed.
For all designs adopt Limit State Method
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PART ?A
1 Design the reinforcements in a circular column of diameter 350mm with helical
ties to support a factored load of 1600kN. The column has an unsupported length
of 3.5m and is braced against side sway. Adopt M-25 grade concrete and Fe-500
[28M]
2 Design a combined footing for the two columns of a multistory building. The
columns of size 400mm?400mm transmit a working load of 800kN each and they
are spaced at 5m centers. The safe bearing capacity of soil at site is 200kN/m
2
.
reinforcements in the combined footing.
[28M]
PART ?B
3 a) Explain the terms: neutral axis depth factor, modular ratio, lever arm coefficient
and moment of resistance with respect to reinforced concrete sections.
[7M]
b) What are the various serviceability states and why they should be considered in
design?
[7M]
4 Determine the moment of resistance of a tee-beam having the following section
properties:
Effective width of flange=2500mm
Depth of flange=150mm
Width of rib=300mm
Effective depth=800mm
Area of steel:6 bars of 25mm diameter
Fe-415 HYSD bars.
[14M]
5 A simply supported reinforced concrete beam of rectangular section 250mm wide
by 450mm overall depth is used over an effective span of 4m. The beam is
reinforced with 3 bars of 20mm diameter Fe-415 HYSD grade steel at an effective
depth of 400mm. Two hanger bars of 10mm diameter are provided. The self
concrete, compute:
i) The short term deflection
ii)The long term deflection according to the provisions of the IS:456-2000 code.

1 of 2
[14M]
R13
SET – 1
|”|”|||”|”’|||’|

Code No: RT31013

6 Design a two-way slab 4m?6m continuous on all edges and supported on 300mm
wide beams to serve as an office floor. Adopt M-25 grade concrete and Fe-500
HYSD bars.
[14M]
7 Design a waist slab type dog legged staircase for an office building using the
following data:
Height between floors=3.2m
Width of flight = landing width=1.25m
The stairs are supported on 300mm load bearing masonry walls at the outer edges
of the landing, parallel to the risers.
Materials: M-20 grade concrete and Fe-415 HYSD bars.
[14M]

*****

2 of 2
R13
SET – 1

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