JNTU
JNTU B.Tech III REINFORCED CONCRETE STRUCTURES DESIGN AND DRAWING Previous Question Paper (March - 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 IS 456 and design charts for columns from sp16 is allowed.
Part A
What are the different types of RCC beam sections based on the area of steel reinforcement provided?
Answer
Based on the area of steel reinforcement, RCC beam sections are classified as: 1) Under-reinforced section, where the steel reaches its yield strain before the concrete reaches its ultimate compressive strain; 2) Over-reinforced section, where concrete reaches its ultimate strain first; and 3) Balanced section, where both concrete and steel reach their respective limiting strains simultaneously.
Distinguish between working stress method of design and limit state method of design.
Answer
The Working Stress Method (WSM) is a deterministic approach based on linear elastic theory using factors of safety for materials, whereas the Limit State Method (LSM) is a probabilistic approach that considers the ultimate strength and serviceability requirements using partial safety factors for both loads and materials.
What are the various parameters influencing the crack width of an RCC beam section?
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Distinguish between anchorage length and development length.
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What is a one-way slab?
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Explain the structural action of a two-way slab.
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What is the mode of failure of a short column?
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Explain the location of columns in a building subjected to axial load and uni-axial bending.
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What are the various functions of a footing?
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Explain the punching shear action with reference to the design of footings.
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Part B
A reinforced concrete beam of effective span 4.5 m and size 230 mm × 350 mm (Total depth) is reinforced with 4 bars of 16 mm diameter in tension and 3 bars of 12 mm diameter in compression. Determine the safe uniformly distributed load that the beam can resist in addition to its self-weight. Use M 30 concrete and Fe 500 steel.
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An L-beam has the cross-section 1000 mm wide and 150 mm thick flange, 300 mm wide web and 600 mm total depth. Design the steel reinforcement to resist factored bending moment of 600 kNm. Use M25 grade concrete and Fe 500 steel. Sketch the reinforcement details.
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Design the steel reinforcement for a beam section 300 mm × 500 mm deep is subjected to ultimate twisting moment of 90 kNm, ultimate bending moment of 150 kNm and ultimate shear force of 100 kN. Use M 30 concrete and Fe 500 steel. Sketch the reinforcement details.
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A simply supported beam of effective span 5 m has cross-section 300 mm × 450 mm (overall depth) is reinforced with 4 bars of 20 mm diameter in tension and 2 bars of 12 mm diameter in compression. The beam is subjected to a superimposed working load of 20 kN/m. Determine only long term deflection. Adopt M 30 grade concrete and Fe 500 steel.
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Design a two-way RCC slab of clear dimensions 5 m × 6 m with two adjacent edges discontinuous. The slab is subjected to live load of 4 kN/m2 and floor finish of 1 kN/m2. Assume the width of the supports is 300 mm. Use M 25 grade concrete and Fe 415 steel.
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Design a two-span continuous beam with simple supports with each span of 4 m. The beam is subjected to a characteristic dead load of 10 kN/m and characteristic live load of 20 kN/m. Also, draw the reinforcement detailing.
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Design an RCC rectangular column of effective length 4 m subjected to an axial load of 1500 kN and uniaxial bending moment of 200 kNm. Use M 25 concrete and Fe 500 steel. Sketch the reinforcement details.
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Design the reinforcement for an RCC column of effective length 4.5 m and cros-section of 400 mm × 500 mm. The column is subjected to a factored axial load of 900 kN along with ultimate moments of 120 kNm and 90 kNm about major and minor axes, respectively. Use M 30 concrete and Fe 500 steel.
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Design the footing for a column of size 400 mm × 400 mm subjected to an axial load of 1200 kN. Assume the bearing capacity of soil is 175 kN/m2. Use M 25 concrete and Fe 500 steel. Sketch the reinforcement details.
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Design a doglegged stair case in a room with clear dimensions 2.4 m × 4.8 m and the storey height is 3.6 m. Assume the live load is 3 kN/m2. Adopt M 25 Concrete and Fe 500 steel. Sketch the reinforcement details.
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