JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III REINFORCED CONCRETE STRUCTURES DESIGN AND DRAWING Previous Question Paper (May/June - 2019 - R13)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
IS 456-2000 code book and SP-16 Pu-Mu charts are allowed.
PART - A
(25 Marks)
Define Lever arm and Moment of resistance.
Answer
Lever arm is the perpendicular distance between the centroid of the compressive force and the centroid of the tensile force in a beam section. Moment of resistance is the internal moment capacity of a structural section, calculated as the product of the total compressive or tensile force and the lever arm.
List out the situation where doubly reinforced beams are used.
Answer
- When the depth of the beam is restricted by architectural or functional requirements, preventing the use of a deep enough singly reinforced section.
- When the bending moment exceeds the maximum moment capacity of a singly reinforced beam of the given dimensions.
- When the beam is subjected to load reversals, such as in cantilever beams or seismic loading conditions.
Define Anchorage and Development length.
Answer
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List the various forms of shear reinforcement.
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Distinguish between restrained and unrestrained slabs.
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Discuss briefly about Torsion reinforcement.
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List minimum number of longitudinal bars required for a rectangular and circular R.C.C. columns.
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List the assumptions made in the design of compression members.
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Distinguish between strap footing and strip footing.
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Define the terms flight, landing and soffit of a staircase.
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PART - B
(50 Marks)
Explain about balanced, under reinforced and over reinforced sections with neat sketches as per limit state method.
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Design a simply supported T-beam for the given data. Span: 6m, Spacing of beams: 2.5 m, slab thickness: 120 mm and Live load: 4 kN/m2. Use M25 concrete and Fe415 steel.
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Design a beam of 400mm deep and 350mm wide cantilever subjected to a central point load of 2kN and U.D.L of 1kN/m over entire span of 6m. Check for shear and deflection. Use M20 mix and Fe415 grade steel.
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Find the reinforcement required for a rectangular beam section with the following data: Width of section = 300 mm, depth of section = 535 mm, factored B.M = 80 kN-m, factored torsional moment = 40 kN-m, factored S.F. = 70 kN. Adopt M 20 grade of concrete and Fe 415 grade of steel.
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Design a slab for room of size 4 m × 5 m supported on 300mm thick masonry walls all around. The corners are free to lift. The Live load is 2.5 kN/m2. Use M20 concrete and Fe415 steel.
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Design a continuous one way slab having three equal span of 3 m each with the following data: Imposed load = 2.5 kN/m2, Thickness of floor finish = 3 cm, concrete grade = M25 and Fe 500 grade steel.
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Design a circular column of diameter 300mm to carry a factored axial load of 1500kN by using (a) Helical reinforcement, (b) Hoop reinforcement. Use M20 concrete and Fe415 steel.
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A R C rectangular column of size 250 mm × 300 mm is reinforced with 4 bars of 20 mm ɸ provided one at each corner with an effective cover of 60mm. Examine the safety of the column. If it is subjected to Pu = 350kN. Mux= 32kNm, Muy = 20 kNm. Assume M20 concrete and Fe415 grade steel.
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Design a rectangular isolated sloped footing for a column of size 350 mm × 450 mm carrying an axial load of 2400kN. The S.B.C of the soil is 250 kN/m2. Use M25 concrete and Fe500 grade steel.
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A flight of stairs to be provided in an office building is to be supported by a stinger beam on one edge and a brick wall on the other. The effective horizontal span of stairs may be taken as 1.5m. The risers are 150mm and the treads are 270mm. Design the steps allowing a L.L of 3 kN/m2. Use M20 concrete and Fe415 steel.
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