A rectangular pre-tensioned prestressed beam has a width of 300mm, a total depth of 600 mm, and a simply supported span of 16m. Grade 1725 stress relieved prestressing tendons are placed at a constant eccentricity of 130mm. The total area of the tendons, subjected to an effective prestressing force of 637.5 KN, is equal to 650.3 sq.mm. Use Eps = 186 MPa, fc’ = 35 MPa and R = 0.25. It is expected that at the time of transfer, the concrete must have reached 75% of its specified strength. Assume that the maximum moment during service loads is 720 KN-m (due to sustained loads). Note : evaluate the allowable stresses given by the code using an uncracked sections. Calculate the concrete stresses at the critical sections during the initial stage.
A rectangular pre-tensioned prestressed beam has a width of 300mm, a total depth of 600 mm, and a simply supported span of 16m. Grade 1725 stress relieved prestressing tendons are placed at a constant eccentricity of 130mm. The total area of the tendons, subjected to an effective prestressing force of 637.5 KN, is equal to 650.3 sq.mm. Use Eps = 186 MPa, fc’ = 35 MPa and R = 0.25. It is expected that at the time of transfer, the concrete must have reached 75% of its specified strength. Assume that the maximum moment during service loads is 720 KN-m (due to sustained loads). Note : evaluate the allowable stresses given by the code using an uncracked sections. Calculate the concrete stresses at the critical sections during the initial stage.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A rectangular pre-tensioned prestressed beam has a width of 300mm, a total depth of 600 mm, and a simply supported span of 16m. Grade 1725 stress relieved prestressing tendons are placed at a constant eccentricity of 130mm. The total area of the tendons, subjected to an effective prestressing force of 637.5 KN, is equal to 650.3 sq.mm. Use Eps = 186 MPa, fc’ = 35 MPa and R = 0.25. It is expected that at the time of transfer, the concrete must have reached 75% of its specified strength. Assume that the maximum moment during service loads is 720 KN-m (due to sustained loads). Note : evaluate the allowable stresses given by the code using an uncracked sections.
- Calculate the concrete stresses at the critical sections during the initial stage.
- Calculate the concrete stresses at the critical sections during the final stages of loading.
- Is the section adequate during initial stage?
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