A rectangular beam of 300mm wide and 800mm deep supports two concentra – McqOptions

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1.	A rectangular beam of 300mm wide and 800mm deep supports two concentrated loads of 20kn each at a span of 9m. Calculate the prestressing force and suggest a suitable cable profile if the eccentricity is 50mm?
A.	600kn
B.	500kn
C.	200kn
D.	800kn
Answer» B. 500kn

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A rectangular prestressed beam 150 mm wide and 300mm deep is used over a effective span of 10m and the cable with zero eccentricity at the supports, linearly varying to 50mm at the centre carries an effective prestressing force of 500kn(Z=225 104). Evaluate stress due to prestressing?