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The net downward force of prestressed concrete beam with bent tendon is given as __________

The net downward force of prestressed concrete beam with bent tendon is given as __________ Correct Answer W-2psinθ

Bent tendons are used in prestressed concrete beams as they tends to provide an upward pressure in the beam and hence reduces the effect of external loading to a great extent, consider a prestressed concrete beam AB of length l it is subjected to a point load W at centre and a prestressing force of P at the ends, the tendon is bent at an angle of θ at the ends, neglecting the frictional losses, the tendon will develop an upward force of magnitude 2Psinθ at the bent at the centre of span, the upward force reduces the effect of the externally applied force in the beam considering equilibrium in vertical direction, the net downward force F = W-2psinθ.

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