JNTU
JNTU B.Tech III REINFORCED CONCRETE STRUCTURES DESIGN AND DRAWING Previous Question Paper (November/December - 2018 - 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.
Part A
Using the stress block parameters, obtain the expression for the total compressive force in the section.
Answer
The total compressive force C is obtained by integrating the stress distribution over the area of the compression zone. For a rectangular section of width b and neutral axis depth xu, with a maximum concrete stress of 0.446fck, the force is given by:
Explain the philosophy of Limit State Method of Design.
Answer
The Limit State Method is a design philosophy that ensures a structure remains fit for its intended use throughout its design life. It considers two primary states: the Limit State of Collapse (safety against structural failure) and the Limit State of Serviceability (functionality, such as deflection and cracking). It uses partial safety factors for both loads and material strengths to account for uncertainties.
What are the various parameters affecting the shear strength of a reinforced concrete section?
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Distinguish between short-term and long-term deflections of RCC beams.
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Explain the necessity of corner reinforcement in two-way rectangular slabs.
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Explain the structural behavior of one-way and two-way slabs.
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Explain the classification of columns based on type of loading.
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List out the functions of transverse reinforcement of a RCC column.
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What are the functions of a foundation for a structure?
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Explain the situations in which combined footings are preferred over isolated footings?
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Part B
Determine the flexural reinforcement required for a beam of span 5.7 m and cross-section 230 mm × 450 mm (overall depth). The beam is subjected to uniformly distributed live load of 30 kN/m in addition to the self-weight. Adopt M25 grade of concrete and Fe415 steel.
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Design a T-beam of a floor consists of 125 mm thick RC slab cast monolithic with 230 mm wide beams. The beams are spaced at 3 m centre-to-centre and of effective span 5 m. The superimposed live load on the slab is 3 kN/m2 and the floor finish is 1 kN/m2. Use M20 grade of concrete and Fe 415 steel.
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A reinforced concrete beam of cross-section 300 mm × 450 mm is reinforced with 4-20 mm bars on the tension side and 2-12 mm bars on the compression side. The shear reinforcement consists of 2-legged 8 mm stirrups at a spacing of 150 mm c/c. The effective cover to the reinforcement is of 40 mm on both sides. Determine the shear strength of the section. Use M 25 grade concrete and Fe 415 steel.
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A RC simply supported beam of span 6 m and cross-section 300 mm × 550 mm (Effective depth) is reinforced with 6 bars of 25 mm diameter on tension side and 3 bars of 20 mm diameter on compression side at an effective cover of 50 mm on both sides. The beam carries a total working load of 60 kN/m over the entire span, out of which 40 kN/m is live load. Determine the short term deflection and deflection due to creep and shrinkage. Adopt the creep coefficient is 1.6 and the ultimate shrinkage strain is 0.0003. Use M 20 grade concrete and Fe 415 steel.
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Design a two-way RC slab of clear dimensions 5 m × 6 m with two adjacent edges continuous. The slab is subjected to a live load of 4 kN/m2 and floor finish of 1 kN/m2. Assume the width of the supports is 300 mm. Use M20 grade concrete and Fe 415 steel. Sketch the reinforcement details.
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An RCC roof slab covering an area of 9 m × 12 m is supported by a 300 mm thick masonry wall all around and equally spaced three intermediate beams of 300 mm wide along the 9 m direction. The slab is subjected to a live load of 4.5 kN/m2 and a dead load of 1.5 kN/m2 in addition to self-weight. Design the continuous roof slab. Use M20 grade concrete and Fe415 steel.
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A column of cross-section 400 mm × 400 mm has an effective length of 4.5 m, is subjected to a factored axial load of 1500 kN, Mux = 175 kNm and Muy = 125 kNm. Design the reinforcement of the column. Use M25 grade concrete and Fe415 steel.
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Determine the reinforcement of a column of cross-section 350 mm × 450 mm, Using the following data: Lex = 5.4 m, Ley = 6 m, Pu = 1500 kN, Mux = 60 kNm at top and 45 kNm at bottom and Muy = 50 kNm at top and 35 kNm at bottom. The column is bent into double curvature. Adopt M 25 grade concrete and Fe 415 steel.
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Design a rectangular footing to support a column of size 500 mm × 600 mm subjected to an axial load of 1750 kN. Adopt the safe bearing capacity of the soil is 180 kN/m2. Use M25 grade of concrete and Fe 415 steel.
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Design a RC combined footing for two columns located 4.5 m apart. The sizes of the columns are 400 mm × 400 mm and 500 mm × 500 mm and transferring axial loads 750 kN and 900 kN respectively. The centre of 400 mm column is 0.6 m from the property line. The safe bearing capacity of the soil is 175 kN/m2. Use M 25 grade concrete and Fe 415 steel.
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