A concrete beam of rectangular cross section 14 in x 24 in is to be reinforced with bonded prestressing tendons having a total cross sectional area of 0.90 in?. The tendons are placed at 3 in from the extreme tension fiber (center to center distance). It has a 25 ft simple span, f'=5,000 psi, fpu=250,000 psi, and the initial prestress is 160,000 psi, fry=0.85fu and 10% losses. What is the stress in Ib-ft due to the weight of the beam at the bottom fiber? Assume unit weight of concrete = 150 lb/ft³.
A concrete beam of rectangular cross section 14 in x 24 in is to be reinforced with bonded prestressing tendons having a total cross sectional area of 0.90 in?. The tendons are placed at 3 in from the extreme tension fiber (center to center distance). It has a 25 ft simple span, f'=5,000 psi, fpu=250,000 psi, and the initial prestress is 160,000 psi, fry=0.85fu and 10% losses. What is the stress in Ib-ft due to the weight of the beam at the bottom fiber? Assume unit weight of concrete = 150 lb/ft³.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A concrete beam of rectangular cross section 14 in x 24 in is to be reinforced with bonded prestressing tendons having a total cross
sectional area of 0.90 in?. The tendons are placed at 3 in from the extreme tension fiber (center to center distance). It has a 25 ft
simple span, f=5,000 psi, fpu=250,000 psi, and the initial prestress is 160,000 psi, fry=0.85fpu and 10% losses. What is the stress in
Ib-ft due to the weight of the beam at the bottom fiber? Assume unit weight of concrete = 150 lb/ft³.
Transcribed Image Text:A concrete beam of rectangular cross section 14 in x 24 in is to be reinforced with bonded prestressing tendons having a total cross
sectional area of 0.90 in?. The tendons are placed at 3 in from the extreme tension fiber (center to center distance). It has a 25 ft
simple span, f.=5,000 psi, fpu=250,000 psi, and the initial prestress is 160,000 psi, føy=0.85fpu and 10% losses. Compute the stress
in prestressed reinforcement, fps in ksi.
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