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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

SIXTH SEMESTER B.TECH DEGREE EXAMINATION(S), DECEMBER 2019

Course Code: CE304
Course Name: DESIGN OF CONCRETE STRUCTURES - II

Use of IS 456, IS 875, IS 1343, IS 3370 , SP 34 and SP 16 are permitted.
Assume any missing data suitably,,.
PARTA
Answer any two full questions, each carries 15 marks.

Design a RCC rectangular column to carry an axial load of 1200 KN anda
moment of 70 kNm, The length of the column is 3.5m. The one end is fixed and
the other end is hinged. The width of the column is restricted to the wall
thickness of 24 cm.

Discuss the analysis of a trapezoidal combined footing and sketch the plan and

elevation.

Design a slender braced circular column under uniaxial bending with the
following
data:
Size of column = 40 cm
Concrete grade = M20
Steel grade = Fe 415
Effective length ratio = 0.85
Unsupported length = 7m
Factored load Pu = 1000 kN
Factored Moment Mux = 60kNm at Top
= 30 kNm at Bottom

Design and detail an isolated footing for a square column 400 mm x 400 mm
carrying a load of 2100 KN. The SBC of the soil is 0 kN/m?.Use M20 concrete
and Fe 415 grade steel
PART B

Answer any two full questions, each carries 15 marks.
A cantilever retaining wall is designed to retain earth for a height of 4 m. Assume
good soil for foundation is at a depth of 1m below the ground level. The safe
bearing capacity of soil is 180 kN/m? and unit weight of soil is 16.5 11/1777.
Coefficient of friction between soil and concrete is 0.5 and angle of shearing
resistance of 30°. Proportion the retaining wall and check for stability. Also
design and detail the stem slab and toe slab of the retaining wall.

Explain the different types of retaining wall. Discuss the design procedure in
detail of a counterfort retaining wall. Also sketch the reinforcement detail

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Duration: 3 Hours

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