GATE CE 2015 Set 2 — Question 55
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Structural Engineering → Slabs, Columns & Prestressed → Prestressed Concrete Beams
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Question
In a pre-stressed concrete beam section shown in the figure, the net loss is 10% and the final prestressing force applied at is 750 kN. The initial fiber stresses (in N/mm) at the top and bottom of the beam were:
Correct answer
(D) -4.166 and 20.833
Solution
1.Calculate initial prestressing force ():
Final force kN, Loss = 10%.kN.
2.Calculate section properties:
Area mm.Eccentricity mm.
Moment of Inertia mm.
Distance to extreme fibers mm.
3.Calculate stresses:
N/mm.
N/mm.
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