JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III Year REINFORCED CONCRETE STRUCTURES DESIGN AND DRAWING Previous Question Paper (August/September - 2024 - 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. iv) Use of only IS456 and design charts for columns from SP16 is allowed.
Part A
What are the advantages of working stress method?
Answer
The working stress method is simple to apply and provides a clear understanding of the elastic behavior of structures. It ensures that the stresses under service loads remain within safe limits, resulting in more conservative and crack-resistant designs.
Write down the values of partial safety factor for i) concrete ii) steel.
Answer
According to IS 456:2000, the partial safety factors are: i) For concrete: 1.5, ii) For steel: 1.15.
What do you understand by the term anchorage?
Answer
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What you mean by diagonal tension?
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Write the various types of slabs.
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Why is secondary/distribution reinforcement provided in one way RC slab?
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According to IS code all the columns shall be designed for minimum eccentricity. Justify the reasons for this statement.
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Differentiate a circular column and rectangle column.
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List any two situations in which combined footings are preferred to isolated footings.
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Why punching shear is not encouraged in design of footing?
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Part B
A singly reinforced beam 250mm×500mm in section in reinforced with four bars of 16mm diameter with an effective cover of 50mm. effective span of the beam is 6m. Assuming M20 grade of concrete and Fe415 grade of steel determine the central concentrated load that can be carried by the beam in addition to its self-weight.
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Determine the area of steel required for a T beam with following dimensions; Depth of slab=100mm Breadth of flange=750mm Width of web=250mm Total depth=600mm. The beam has an ultimate moment of resistance of 525KNm. Concrete grade M25 and steel grade Fe415 are used with effective cover 50mm.
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Find the reinforcement required for a rectangular beam section for the following data. Size of the beam 300mm×600mm, factored moment=115KNm, Factored torsion= 45 KNm, Factored shear=95KN. Use M 20 concrete and Fe 415 steel. Sketch the reinforcement details.
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Design torsional reinforcement in a rectangular beam section, 230mm wide 600mm deep, subject to an ultimate twisting moment of 120 KNm combined ultimate shear force of 100KN. Assume M-25 grade concrete, Fe415 grade steel and mild exposure condition. Sketch the reinforcement details.
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Design a two way slab for an office floor size 3.5m × 4.5m with discontinuous and simply supported edges on all the sides with the corners prevented from lifting and supporting a service live load of 4.4kN/m2. Adopt M20 grade and Fe 415HYSD bars.
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Calculate the reinforcement details of a one way slab for an office floor which is continuous over tee beam spaced 4m intervals. Assuming a live load of 3 kN/m2. Adopt limit state design. Use M25 grade concrete and Fe500 steel bars.
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Design a uniaxial spiral circular short column with details as given below. (a) Factored axial load = 300kN (b) Factored bending moment = 80kNm (c) Column size = 400mm Use M25 and Fe500 combination.
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Discuss the design steps used in the limit state methods of design of slender compression members.
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Design an isolated square sloped footing for a column 500 × 500 mm, transmitting an axial load of 1200 KN. The column is reinforced with 8 bars of 20 mm diameter. The safe bearing capacity of soil is 120 KN/m2. Use M30 and Fe500. Sketch the reinforcement details.
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Design a rectangular isolated footing of uniform thickness for R.C. column bearing a vertical load of 600kN, and having a base size of 400 × 600 mm. The SBC of soil is 120kN/m2. Use M25grade concrete and Fe500 grade steel bar. Sketch the reinforcement details.
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