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11030 Pages: 2

Explain the design procedure for spherical dome. 5

A circular slab is 5m inside diameter and is fixed at the edges. It is loaded witha (15)
live load of 3 KN/m?. Design the reinforcement for the slab and sketch the
details. Assume M 20 concrete and Fe 415 steel.
PART C
Answer any two full questions, each carries20 marks.

Design and detail a circular tank for a capacity of 500000 litres. The depth of (20)
water is to be 5൩ including freeboard of 30cm. The tank is supported on ground.
Design using M20 concrete and 415 grade steel.

Discuss in detail the losses involved in prestressing (5)

A post-tensioned cable of a beam 9 m long initially tensioned to a stress of 1000 15
N/mm‘ at one end. If the tendons are curved so that the slope is 1 in 24 at each

end with an area of 600 mm”. Calculate the loss of prestress due to the following

data

Coefficient of friction between duct and cable — 0.25

Friction coefficient for wave effect - 0.0091/m

During anchorages if there is a slip of 3 mm at the jacking end, calculate the final
force in the cable and the percentage of loss due to friction and slip.

Es= 210 x10° N/mm?

Explain the principle of prestressing 4

Explain the reasons for using high strength materials in prestressed concrete 6

A rectangular concrete beam 250 mm wide and 550 mm deep is prestressed by 10
means of 4 numbers 12 mm diameter high tensile bars located at 200 mm from

the soffit of the beam. If the effective stress in the wire is 700 N/mm2, what is the
maximum bending moment that can be applied at the soffit of the beam

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