A simply supported rectangular prestressed concrete beam is subjected to uniformly distributed live load over its entire span, such that the resulting stress at the midspan at bottom fibre is zero. The eccentricity at that section is d/6 below the C.G., where d is the depth of the beam. Location of the thrust line at that section is

A simply supported rectangular prestressed concrete beam is subjected

1.	A simply supported rectangular prestressed concrete beam is subjected to uniformly distributed live load over its entire span, such that the resulting stress at the midspan at bottom fibre is zero. The eccentricity at that section is d/6 below the C.G., where d is the depth of the beam. Location of the thrust line at that section is
A.	At C.G.
B.	d/6 above C.G.
C.	d/6 below C.G.
D.	d/3 below C.G.
Answer» C. d/6 below C.G.

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