Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech III REINFORCED CONCRETE STRUCTURES DESIGN AND DRAWING Previous Question Paper (January/February - 2023 - R13)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
PART - A
Distinguish between under-reinforced and over-reinforced sections.
Answer
In an under-reinforced section, the steel reaches its yield strain before the concrete reaches its ultimate compressive strain, leading to a ductile failure. In an over-reinforced section, the concrete reaches its ultimate strain first, causing a sudden, brittle failure without warning.
Why doubly reinforced sections are used?
Answer
Doubly reinforced sections are used when the dimensions of a beam are restricted due to architectural or headroom requirements, and the moment to be resisted exceeds the moment of resistance capacity of a singly reinforced section of the same size. They are also used to increase the ductility of the beam and to reduce long-term deflections caused by creep and shrinkage.
What is the significance of anchorage length?
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What are the factors influencing the bond strength?
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What is the one-way action of a slab?
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When do you provide corner reinforcement in slabs?
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What is the mode of failure of a short column?
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What are the functions of transverse reinforcement in an RCC column?
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Define the allowable soil pressure.
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What are the various requirements of a pedestal to a column?
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PART - B
A doubly reinforced concrete beam of section 300 mm × 450 mm (Total depth) is reinforced with 2 bars of 12 mm diameter in compression zone and 4 bars of 20 mm diameter in tension zone. Determine the moment of resistance of the section. Use M 30 grade concrete and Fe 415 steel.
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A reinforced concrete slab of 100 mm thick is supported by 230 mm wide RCC beams spaced at 3 m c/c. The beams have a clear span of 5 m cast monolithic with slab and supported on 300 mm wide supports. The live load acing on the floor is 3 kN/m2 and the floor finish is 1.5 kN/m2. Design the T-beam section using M 25 grade concrete and Fe 415 steel.
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Design a beam section 300 mm×500 mm subjected to an ultimate twisting moment of 90 kNm in addition to an ultimate bending moment of 180 kNm and an ultimate shear force of 120 kN. Adopt M 25 grade concrete and Fe 500 steel.
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A simply supported RCC beam of effective span 5.2 m has 300 mm × 450 mm (overall depth) cross-section, is reinforced with 4 bars of 16 mm diameter in tension and 2 bars of 12 mm diameter in compression. The beam is subjected to a superimposed live load of 50 kN/m. Determine the short term deflection. Adopt M 25 grade concrete and Fe 500 steel.
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Design a reinforced concrete slab of clear dimensions 5 m × 6 m with two adjacent edges discontinuous. The slab is subjected to a live load of 3 kN/m2 and floor finish of 1 kN/m2. Assume the width of the supports is 230 mm. Use M 20 grade concrete and Fe 415 steel.
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Design a continuous RCC slab for hall of 5 m × 9 m. The slab is supported on beams of size 230 mm × 350 mm cast monolithic with slab spaced at 3 m c/c and is subjected to live load of 2 kN/m2 and floor finish of 1 kN/m2. Use M 20 grade concrete and Fe 415 steel.
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Design an RCC square column of effective length 4.5 m subjected to an axial load of 1250 kN and moment of 150 kNm about the centroidal axis. The size of the section is limited to 400 mm. Use M 25 concrete and Fe 500 steel.
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Design the reinforcement for a braced column of effective length of 5.7 m and cross-section 300 mm × 350 mm subjected to a factored load of 1250 kN. Use M 30 grade concrete and Fe 500 steel.
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Design the footing for a column of size 300 mm × 300 mm subjected to an axial load of 1200 kN. Assume the bearing capacity of soil is 180 kN/m2. Use M30 concrete and Fe 500 steel.
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Design a dog-legged stair for a building of storey height 3.6 m. The size of the stair hall is 2.4 m × 4.8 m. Adopt the live load as 3 kN/m2. Use M25 Concrete and Fe 500 steel. Draw the reinforcement details.
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