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Reg No.:

FIFTH SEMESTER B.TECH DEGREE EXAMINATION(R&S), DECEMBER 2019

Max. Marks: 100

1 ஐ
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2 a)
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E192009 Pages:2

Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Course Code: CE301
Course Name: DESIGN OF CONCRETE STRUCTURES I
Use of IS 456:2000 is permitted

PARTA
Answer any two full questions, each carries 15 marks.
Distinguish between balanced, over-reinforced and under-reinforced sections in
limit state design. Which of these should be recommended in design?
Find the moment of resistance of a singly reinforced concrete beam of 200 mm

width and 400 mm effective depth, reinforced with 4 bars of 16 mm diameter of

Fe415 steel. Take M20 concrete. Redesign the beam if necessary.

With neat sketch explain the stress block parameters used in the design of singly
reinforced concrete beam as per limit state method.
Design the shear reinforcement for a beam with b= 350 mm, d= 550 mm, V,=

125 KN, 5 25 N/mm’, = 415 N/mm’. Percentage of steel is 1.67 percent.

A simply supported beam, 300 mm wide and 600 mm effective depth carries a
uniformly distributed load of 74 kN/m including its own weight over an effective
span of 6 m. The reinforcement consists of 5 bars of 25 mm diameter. Out of
these, two bars can be safely bent up at | m distance from the support. Design
shear reinforcement for the beam.

Define development length and derive an expression for development length.

PART ‏تا‎
‎Answer any two full questions, each carries 15 marks.
What are the situations that demand double reinforcement in beams? Compare
the stress strain distributions in singly reinforced and doubly reinforced beams.
Determine the moment of resistance of beam having width b of 350 mm, depth of
900 mm with a cover of 50 mm. Beam is reinforced with 5 tension

reinforcements of 20 mm HYSD bars (Fe 415) and 2 compression reinforcements

of 20 mm Fe 415 steel. Grade of concrete is M15.

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Duration: 3 Hours

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