03000CE304052004

Design & detail a spherical dome for a circular water tank of diameter 10m. Rise of

dome is 2m. Liveload=2.5kN/m’. fck=20N/mm/ and fy=415N/mm?

Design a circular slab for a room of inside diameter 5m,simply supported on brick
wall of 230mm thickness, superimposed 0.0.1 is 3.5kN/m? and weight finishes
1kN/m?.Use M20 and Fe415 steel.Sketch reinforcement details in plan & section of
slab.
PART C

Answer any two full questions, each carries20 marks.
Design a circular tank with flexible base resting on ground for capacity of 4 lakhs
litres. The depth of tank is to be 4m including freeboard of 200mm.Use M30 Concrete
&Fe415 Steel. Draw the reinforcement details in sectional elevation & plan through
tank wall.
An unsymmetrical I section is used to support an imposed load 1OkKN/m over a span of
8m.Section details are Top flange=300x60mm:Bottom
Flange=100mmx60mm:Overall depth of the beam =400mm:thickness വ്‌
web=80mm. Initial prestressing force of 300121 is applied at 100mm above soffit of
the beam. Estimate the stresses at the centre of span section of the beam for the
following condition.1)Prestress+selfweight 2)Prestress,self weight,liveload. Assume
total loss as 20%.Show stress diagrams.
A Prestressed concrete pile 300mmx300mm and is provided with 40 wires of 3mm
diameter distributed uniformly over the section, Initially the wires are tensioned in the
bed with total pull of 200 kN. Determine the final stress in the section and the
percentage loss of stress in wires .Relaxation loss of stress in steel=4.5% of initial

stress .Ec=35kN/mm7,Es = 210kN/mm?,Creep coefficient 1.6;Shrinkage strain=3x 104

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