JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B. Tech III Year STRUCTURAL ENGINEERING - I (RCC) Previous Question Paper (January/February - 2023 - R18)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 15 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 12 marks and may have a, b as sub questions. iv) Use of only IS 456 is allowed.
Part A
What is meant by ‘Stress Block’?
Answer
The stress block is a simplified rectangular or parabolic-rectangular representation of the actual stress distribution in the concrete compression zone of a reinforced concrete section at the ultimate limit state.
Explain the terms ‘balanced section’ as per Limit state method.
Answer
A balanced section is one where the concrete in the compression zone and the steel in the tension zone reach their respective ultimate strain limits (0.0035 for concrete and 0.002 + 0.87fy/Es for steel) simultaneously. In this state, the section fails by crushing of concrete and yielding of steel at the same moment.
Explain the term Diagonal tension cracks.
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Bring out the differences between primary torsion and secondary torsion.
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What are the Span/Depth ratio in two way slabs for both simply supported slab and continuous slabs?
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Distinguish between one way and two way slabs with examples.
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What is meant by short column and long column?
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What is the significance of the term “slenderness ratio” with reference to the design of compression members?
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What are the situations in which the combined footings are preferred to isolated footings?
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How do you select the depth of a footing? What critical section in footing do you check for safety against shear?
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Part B
Design a singly reinforced section for a simply supported beam of effective span 5 m carrying an imposed load of 10 kN/m. Use M30 grade concrete and Fe 500 grade steel. Assume mild exposure condition. Adopt working stress method. Design reinforcement for flexure and shear. Sketch the reinforcement details.
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A floor system consists of a slab 150 mm thick, cast integrally on beams spaced at 3m centre to centre and spanning over 6.3m. The beam has a width of 300mm and the total depth of the beam including the thickness of slab is 650 mm. Assume moderate exposure condition. The floor is to be designed for a service load of 3 kN/m2 and 1.2 kN/m2 for finishes, excluding the self weight of the floor system. Design one intermediate T-beam for flexure using Limit State method. Use M25 concrete and Fe 500 grade steel. Sketch the reinforcement details.
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With a neat sketch, explain the force components that participate in the shear transfer mechanism at a flexural-shear crack location in a reinforced concrete beam.
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A simply supported beam of 5.5 m effective span, is to carry a uniformly distributed load (dead load) of 35 kN/m including its self weight, and a live load of 40 kN/m. Design the beam for shear using Limit state method. Use M35 concrete and Fe 500 grade steel. Sketch the reinforcement details.
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What are the various bond failure mechanisms?
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For a reinforced concrete tension member, a 12mm diameter rebar has to be lap spliced with a 20mm diameter rebar. Use M 30 concrete and Fe 500 grade steel. Design a suitable splice.
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Design an axially loaded tied column with an unsupported length of 4 m. The column is fixed at one end and pinned at the other end. The column has to carry a factored load of 2000 kN. Use M 35 grade concrete and Fe 500 grade steel. Sketch the reinforcement details. Assume moderate exposure condition.
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A column 300 mm × 450 mm has an effective length of 4 m. It is subjected to an ultimate load of 1800 kN and an ultimate moment of 350 kNm about its major axis. Determine the longitudinal and transverse reinforcement. Use M30 concrete and Fe 500 grade steel. Assume moderate exposure condition. Sketch the cross-section showing reinforcement details.
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Design a rectangular isolated stepped footing for a column of size 400 mm × 600 mm carrying an axial load of 2500 kN. The S.B.C. of the soil is 300 kN / m2. Use M 30 grade concrete and Fe 500 grade steel. Assume severe exposure condition.
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Design an isolated circular footing for a reinforced concrete circular column 600 mm diameter, subjected to a factored axial load of 1600 kN. The column is reinforced with 8 reinforcing bars of 20 mm diameter. The safe bearing capacity of the soil is 250 kN/m2 at a depth of 1.2 m. Assume M30 concrete and Fe 500 grade steel. Sketch the reinforcement details.
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Design a R.C. slab for a room measuring 5 m × 6.5 m. The slab carries a live load of 4 kN/m2. The slab is simply supported at all the four edges with corners free to lift. The width of the supporting walls is 350 mm. Use M 25 grade concrete and Fe 500 grade steel. Adopt Limit State method. Sketch the reinforcement details. Assume mild exposure condition.
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A simply supported doubly reinforced beam of rectangular section 350 mm wide and 600 mm overall depth, is reinforced with 6 bars of 20 mm diameter on the tension face and 2 bars of 16 mm diameter on the compression face. Assume mild exposure condition. The beam spans over an effective length of 7 m. Estimate only the long-term deflection. Use M30 concrete and Fe 415 grade steel.
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