F.Y. M.Tech. Civil (Structural Engineering) (Semester-
Examination, 2018
Elective I advanced design of concrete structures
(New cbcs)
Day and Date Wednesday, 12-12-2018 Total Marks 70
Time 10.00 a.m. to 2.00 p.m.
Instructions Answer any two questions from each Section.
ii) Use of IS 456 and IS 3370 Part IV are allowed.
iii) Assume suitable data if necessary.
iv) Draw neat sketches wherever necessary.
section i
1. A.R.C. grid floor is to be designed to cover a floor area of 12 m × 18 m.
The spacing of the ribs in mutually perpendicular directions is 1.5 m c/c.
Live load on floor is 3kN/m2. Adopt M20 grade concrete and Fe500 steel.
Assume ends are simply supported. Analyse the grid floor by IS 456 2000
method and design suitable reinforcement in the grid floor. 13
Explain imperial design method for shear wall subjected to in plane
vertical loads. 4
2. Design a corbel to carry an ultimate load of 610 kN at a distance of 250
mm from the face of a column of size 400 mm × 400 mm. Use M25 grade
of concrete and Fe500 steel. 14
Draw the variation of radial and circumferential moment in case of
partially fixed support circular slab subjected to U.D.L. 4
3. Design a combined footing to support two columns of 400 mm × 400 mm
spaced 4.5 m apart, carrying axial loads of 825 kN and 1000 kN respectively.
The SBC of the soil is 150 kN/m2. The property line is 0.4 m from the centre
of column carrying 800 kN load. Adopt M20 grade of concrete and Fe415
steel. 14
Under what circumstances a beam is termed as deep beam and what
are the guide line for determination of lever arm for deep beams. 3
Set P
section iI
4. Design a top slab, vertical walls and bottom slab of rectangular tank having
capacity 30,000 litres ESR with individual wall panel, top hinged, bottom
and vertical edges are fixed. The bottom slab is resting on four beams
supported by four peripheral columns. The depth of water may be kept as
3 m with free board 0.3 m. Use M25 grade of concrete and Fe500 steel.
Adopt IS code method of design. 14
Explain wind load analysis of tank supported on four identical columns
with their lower ends fixed and braced at intermediate levels. 4
5. Design a chimney of height 70 m and check the stresses in bars. Use following
data, external diameter 4 m at top and 4.9 m at base, shell thickness
200 mm at top and 400 mm at base. Wind intensity is 1.8 kN/m2, throughout.
Thickness of fire brick lining 100 mm and air gap is 100 mm. Temperature
difference is 71° C and coefficient of thermal expansion is 11 × 10-6/C°.
Es 210 × 103 N/mm2. Unit weight of brick lined 20 kN/m3. Use M 25
grade of concrete and Fe 500 steel. 14
Draw a sketch of silo and show its components. 3
6. Design the side wall and hopper bottom of a rectangular bunker of capacity
320 kN to store wheat of unit weight 8 kN/m3, angle of repose 25°. Use
M20 grade of concrete and Fe500 steel. 14
Write on temperature stresses developed in chimney. 3