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U 5. A prestressed concrete rectangular beam of size 300 x 900 mm is prestressed with an initial prestressing force of 700 kN at an eccentricity of 350 mm at midspan, stress at top fiber at midspan due to prestress alone is: a. 3.46 (tension) b. 8.64 (compression) c. 2.59 (compression) d. Zero

U 5. A prestressed concrete rectangular beam of size 300 x 900 mm is prestressed with an initial prestressing force of 700 kN at an eccentricity of 350 mm at midspan, stress at top fiber at midspan due to prestress alone is: a. 3.46 (tension) b. 8.64 (compression) c. 2.59 (compression) d. Zero

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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5. A prestressed concrete rectangular beam of size 300 x 900 mm is prestressed with an initial prestressing force of 700 kN at an eccentricity of 350 mm at midspan, stress at top fiber at midspan due to prestress alone is: a. 3.46 (tension) b. 8.64 (compression) c. 2.59 (compression) d. Zero 6. A post-tensioned bonded concrete beam has a prestress of 1560 kN in the steel immediately after prestressing after prestressing which eventually reduces to 1330 kN. The beam carries two live loads of 45 kN each in addition to its own weight of 4.40 kN/m. Compute the extreme fiber stresses at mid-span: 45 KN 45m 45 KN 3m 4.5 m 600 mm 300 mm Mid span section
Transcribed Image Text:5. A prestressed concrete rectangular beam of size 300 x 900 mm is prestressed with an initial prestressing force of 700 kN at an eccentricity of 350 mm at midspan, stress at top fiber at midspan due to prestress alone is: a. 3.46 (tension) b. 8.64 (compression) c. 2.59 (compression) d. Zero 6. A post-tensioned bonded concrete beam has a prestress of 1560 kN in the steel immediately after prestressing after prestressing which eventually reduces to 1330 kN. The beam carries two live loads of 45 kN each in addition to its own weight of 4.40 kN/m. Compute the extreme fiber stresses at mid-span: 45 KN 45m 45 KN 3m 4.5 m 600 mm 300 mm Mid span section
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