Name of the College : Sphoorthy Engineering College
University : JNTUH
Department : CIVIL ENGINEERING
Subject Code/Name : 09A50102/DESIGN OF REINFORCED CONCRETE STRUCTURES
Degree : B.Tech
Year/Sem : III/I
Website : sphoorthyengg.com
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/sphoorthyengg.com/4858-4809A50102%20-%20DESIGN%20OF%20REINFORCED%20CONCRETE%20STRUCTURES.pdf
Design of Reinforced Concrete Structures :
B. Tech III Year I Semester Examinations, December-2011
Time: 3 hours
Max. Marks: 75
Related : Sphoorthy Engineering College 09A50103 Engineering Geology B.Tech Question Paper : www.pdfquestion.in/4857.html
Answer any five questions :
All questions carry equal marks :
1.a) What is Stress block as per the Limit state method? Derive the stress block parameters from first principles.
b) Design flexural reinforcement for an RC beam of size 300mm wide and 500mm deep to resist an ultimate moment of 245 kNm. Assume moderate exposure condition. Use M25 concrete and Fe 500 grade steel. Adopt Limit State method. [7+8]
2. A floor system consists of a slab 100mm thick, cast integrally on beams spaced at
4.5 m centre to centre and spanning over 6 m. The beam has a width of 300 mm and the total depth of the beam including the thickness of slab is 550mm.
Assume mild exposure condition. The floor is to be designed for a service load of 3 kN/m2 and 0.8 kN/m2 for finishes excluding the self weight of the floor system. Design flexural and shear reinforcement for one intermediate T-beam using Limit State method. Use M25 concrete and Fe415 steel. [15]
3.a) Explain the concept of ‘bond’ in RC structures, with a sketch.
b) Design the torsional reinforcement in a rectangular beam section 360 × 780 mm deep (overall depth) subjected to an ultimate twisting moment of 180 kNm, combined with an ultimate hogging bending moment of 260 kNm and ultimate shear of 170 kN.
Use M30 concrete and Fe 500 steel. Assume mild exposure condition. Sketch the reinforcement details. [7+8]
4. Design a R.C. slab for a room measuring 5 m × 6 m. The slab carries a live load of 3.5 kN/m2. The slab is simply supported at all the four edges with corners free to lift. The width of the supporting walls is 300 mm. Use M 25 grade concrete and Fe 415 grade steel. Sketch the reinforcement details. Assume mild exposure condition. [15]
5. Design a rectangular isolated sloped footing for a column of size 360 mm × 660 mm carrying an axial load of 2500 kN. The S.B.C. of the soil is 280 kN / m2 . Use M 30 grade concrete and Fe 500 grade steel. Sketch the reinforcement details. Assume moderate exposure condition. [15]
6. Design a short helically reinforced column of unsupported length 3.8 m to carry an axial service load of 1200 kN. Use M 25 concrete and Fe 250 grade steel. Sketch the reinforcement details. Assume moderate exposure condition. [15]
7.a) Distinguish between short-term deflection and long-term deflection in RC members.
b) A one-way slab has been designed for a simply supported effective span of 4.6 m with an overall depth of 160 mm and clear cover of 20 mm, M25 concrete and Fe 500 steel.
The dead loads are taken as 4.0 kN/m2 and the live loads as 2.0 kN/m2 . The longitudinal bars are designed as 12 mm dia @ 150 c/c. verify the adequacy of the thickness provided,
i) Applying the limiting span/effective depth ratio;
ii) Actual calculation of total deflections. [7+8]
8. The clear dimensions of a staircase hall are 28 m × 4.4 m. The floor to floor height is 3.6 m. The landing slabs span in the same direction as the stair and are supported by the walls at the ends. The stair is used in a residential building. Design a dog-legged staircase.
Use M 30 concrete and Fe 500 steel. Sketch the reinforcement details. Sketch the reinforcement details. Assume moderate exposure condition. [15]
B. Tech III Year I Semester Examinations, December-2011 Set II :
1.a) Explain the balanced, under-reinforced and over-reinforced sections as per Working Stress and Limit State Methods.
b) Design flexural reinforcement for an RC beam of size 250 mm wide and 450 mm deep to resist an ultimate moment of 215 kNm. Assume moderate exposure condition. Use M25 concrete and Fe 415 grade steel. Adopt Limit State method. [7+8]
2.a) Explain the effective flange width of a T-beam showing the actual and assumed stress distribution.
b) A floor system consists of a slab 110mm thick, cast integrally on beams spaced at 3.5 m centre to centre and spanning over 7 m. The beam has a width of 300 mm and the total depth of the beam including the thickness of slab is 600mm. Assume mild exposure condition.
The floor is to be designed for a service load of 4 kN/m2 and 0.8 kN/m2 for finishes excluding the self weight of the floor system. Design flexural and shear reinforcement for one intermediate T-beam using Limit State method. Use M25 concrete and Fe415 steel.