he beam shown has a 30-ft. simple span; f’c = 5,000 psi, fps = 250,000 psi, and the initial prestress is 160,000 psi. Assume fpy = 0.85 fpu a. Find the concrete stresses in the top and bottom of the beam at midspan immediately after the tendons are cut; b. Assume 20% prestress losses in the tendons, find the new stresses at the top and bottom at midspan; c. Find the maximum service live load that the beam can support if allowable stresses of 0.60f’c in compression and 12√?′? in tension are permitted.
he beam shown has a 30-ft. simple span; f’c = 5,000 psi, fps = 250,000 psi, and the initial prestress is 160,000 psi. Assume fpy = 0.85 fpu a. Find the concrete stresses in the top and bottom of the beam at midspan immediately after the tendons are cut; b. Assume 20% prestress losses in the tendons, find the new stresses at the top and bottom at midspan; c. Find the maximum service live load that the beam can support if allowable stresses of 0.60f’c in compression and 12√?′? in tension are permitted.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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The beam shown has a 30-ft. simple span; f’c = 5,000 psi, fps = 250,000 psi, and the initial prestress is 160,000 psi. Assume fpy = 0.85 fpu
a. Find the concrete stresses in the top and bottom of the beam at midspan immediately after the tendons are cut;
b. Assume 20% prestress losses in the tendons, find the new stresses at the top and bottom at midspan;
c. Find the maximum service live load that the beam can support if allowable stresses of 0.60f’c in compression and 12√?′? in tension are permitted.
Transcribed Image Text:0.9 in.²
←14 in.→
21 in.
3 in.
24 in.
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