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QUESTION 1 The cross section of an I beam has top and bottom flanges having a width of 400mm and a thickness SS of 200mm. The web is 150 mm wide. The beam is 15m long and simply supported. It carries a uniformly distributed imposed load of 12 kN/m. If the initial prestress is 1100 kN and the eccentricity is 325 mm below the beam centroid, find the stresses at midspan a) under the self-weight of the beam only if the short-term losses is 20% b) under service load if the prestress is reduced to an additional 10%

QUESTION 1 The cross section of an I beam has top and bottom flanges having a width of 400mm and a thickness SS of 200mm. The web is 150 mm wide. The beam is 15m long and simply supported. It carries a uniformly distributed imposed load of 12 kN/m. If the initial prestress is 1100 kN and the eccentricity is 325 mm below the beam centroid, find the stresses at midspan a) under the self-weight of the beam only if the short-term losses is 20% b) under service load if the prestress is reduced to an additional 10%

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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QUESTION 1 The cross section of an I beam has top and bottom flanges having a width of 400mm and a thickness of 200mm. The web is 150 mm wide. The beam is 15m long and simply supported. It carries a uniformly distributed imposed load of 12 kN/m. If the initial prestress is 1100 kN and the eccentricity is 325 mm below the beam centroid, find the stresses at midspan a) under the self-weight of the beam only if the short-term losses is 20% b) under service load if the prestress is reduced to an additional 10%
Transcribed Image Text:QUESTION 1 The cross section of an I beam has top and bottom flanges having a width of 400mm and a thickness of 200mm. The web is 150 mm wide. The beam is 15m long and simply supported. It carries a uniformly distributed imposed load of 12 kN/m. If the initial prestress is 1100 kN and the eccentricity is 325 mm below the beam centroid, find the stresses at midspan a) under the self-weight of the beam only if the short-term losses is 20% b) under service load if the prestress is reduced to an additional 10%
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