Reg. No. ________
Karunya University
(Karunya Institute of Technology and Sciences)
(Declared as Deemed to be University under Sec.3 of the UGC Act, 1956)
End Semester Examination – November/December 2010
Subject Title:
Subject Code:
ADVANCED DESIGN OF REINFORCED CONCRETE STRUCTURES
Time : 3 hours
09CE303
Maximum Marks: 100
Answer ALL questions (5 x 20 = 100 Marks)
(Use of IS 456, IS 1893, BS 110 (Part I), ACI 318, SP 16 (S & T),
SP 24 (S & T) is permitted)
1.
Compulsory:
A ‘T’ beam of flange width 700 mm and thickness 120 mm and web of width 350 mm and
depth 800 mm is subjected to a bending moment of 215 kN-m, shear of 150 kN and torsion of
105 kN-m. Assuming fck = 30 MPa and fy = 415 N/mm2, design the reinforcements according
to IS 456. Cover to centre of steel is 50 mm.
2.
3.
4.
5.
6.
7.
8.
9.
Design the side walls and hopper bottom of a 3 m x 3 m square bunker to store 30 tonnes of
coal. Density of coal = 9 kN/m3. Angle repose is 30°. Adopt M15 grade ribbed tor steel.
(OR)
A cement silo has an internal diameter of 10 m with the height of cylindrical portion being
30 m. The density of cement is 15.2 kN/m3. Coefficient of friction between concrete and
material = 0.7. The angle of repose of the material is 17.5°. Using M15 and ribbed tor steel
design the thickness and reinforcement at the bottom of the cylindrical portion of the silo using
Janssen’s theory
Explain in detail, the design procedure for the analysis of flat slab by equivalent frame method.
(OR)
a. Explain Hillerborg’s simple strip method of analysis
(10)
b. Briefly describe the design procedure of isotropically reinforced rectangular slab.
(10)
Design a continuous beam of two span supported on stone masonry wall using the LSD and
allowing for 15% redistribution of moments. The following data may be used. Clear span
between supports = 6 m; Width of masonry support = 300 mm; Thickness of reinforced
concrete slab = 150 mm; Spacing of continuous beam = 3 m c/c; Self weight of floor finish =
0.4 kN/m2; Live load on office floor = 4 kN/m2; fck = 15 N/mm2; fy = 415 N/mm2.
(OR)
A continuous beam with simple supports has two spans each of 8 m. The characteristic dead
load is 10kN/m and the characteristic live load is 15 kN/m. Design the critical sections of the
beam and sketch the details of reinforcement. Adopt M15 and ribbed tor steel. Adopt 15%
redistribution of moments.
Design a typical interior span of continuous deep beam using the following data:
Span of beam =L =9 m; Overall depth of beam = D = 4.5 m; Width of support (C) = 0.9 m;
Width of beam (b) = 0.4 m; udl (including self weight) = 200 kN/m; M20 and Fe415 grade.
Sketch the details of reinforcement at centre of span and support section.
(OR)
Design a corbel to carry a factored load of 500 kN at a distance of 200 mm from the face of a
300 mm x 300 mm column. Assume the grade 30 concrete used for construction.