A prestressed concrete rectangular beam has a width = 400 mm and a depth = 900 mm. It is simply supported over a span length of 12 m. The beam is subjected to a prestressing force of 2000 kN using a parabolic cable profile having an eccentricity of 240 mm at mid span and zero eccentricity at the supports. Calculate the minimum dead load moment including the self weight and the corresponding maximum possible live load moment at the centre span of the beam at service load, if the service load stress in the beam should be never tensile.

A prestressed concrete rectangular beam has a width = 400 mm and a dep

1.	A prestressed concrete rectangular beam has a width = 400 mm and a depth = 900 mm. It is simply supported over a span length of 12 m. The beam is subjected to a prestressing force of 2000 kN using a parabolic cable profile having an eccentricity of 240 mm at mid span and zero eccentricity at the supports. Calculate the minimum dead load moment including the self weight and the corresponding maximum possible live load moment at the centre span of the beam at service load, if the service load stress in the beam should be never tensile.
Answer» A prestressed concrete rectangular beam has a width = 400 mm and a depth = 900 mm. It is simply supported over a span length of 12 m. The beam is subjected to a prestressing force of 2000 kN using a parabolic cable profile having an eccentricity of 240 mm at mid span and zero eccentricity at the supports. Calculate the minimum dead load moment including the self weight and the corresponding maximum possible live load moment at the centre span of the beam at service load, if the service load stress in the beam should be never tensile.

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