A prestressed beam has a cross section of 250 mm x 500 mm and has a simple span of 6 m. The tendons are placed 70 mm above the bottom of the beam. The wires used are stress relieved tendons with fpu= 1350 MPa and fpe= 760 MPa, fc'=35 MPa. The prestressed beam is not to be grouted after application of the prestress. Aps= 1000 sq. mm 1. Compute the stress in prestressed reinforcement at nominal strength. a. 868 MPa b. 960 MPa c. 759 MPa d. 672 MPa 2. Compute the ultimate moment capacity of the prestressed beam. a. 158 KN-m b. 225 KN-m c. 290 KN-m d. 327 KN-m 3. Compute the safe live load that the prestressed beam could carry. a. 35.49 KN/m b. 38.07 KN/m c. 40.95 KN/m d. 31.87 KN/m
A prestressed beam has a cross section of 250 mm x 500 mm and has a simple span of 6 m. The tendons are placed 70 mm above the bottom of the beam. The wires used are stress relieved tendons with fpu= 1350 MPa and fpe= 760 MPa, fc'=35 MPa. The prestressed beam is not to be grouted after application of the prestress. Aps= 1000 sq. mm 1. Compute the stress in prestressed reinforcement at nominal strength. a. 868 MPa b. 960 MPa c. 759 MPa d. 672 MPa 2. Compute the ultimate moment capacity of the prestressed beam. a. 158 KN-m b. 225 KN-m c. 290 KN-m d. 327 KN-m 3. Compute the safe live load that the prestressed beam could carry. a. 35.49 KN/m b. 38.07 KN/m c. 40.95 KN/m d. 31.87 KN/m
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A prestressed beam has a cross section of 250 mm x 500 mm and has a simple span of 6 m. The tendons are placed 70 mm above the bottom of the beam. The wires used are stress relieved tendons with fpu= 1350 MPa and fpe= 760 MPa, fc'=35 MPa. The prestressed beam is not to be grouted after application of the prestress. Aps= 1000 sq. mm
1. Compute the stress in prestressed reinforcement at nominal strength.
a. 868 MPa
b. 960 MPa
c. 759 MPa
d. 672 MPa
2. Compute the ultimate moment capacity of the prestressed beam.
a. 158 KN-m
b. 225 KN-m
c. 290 KN-m
d. 327 KN-m
3. Compute the safe live load that the prestressed beam could carry.
a. 35.49 KN/m
b. 38.07 KN/m
c. 40.95 KN/m
d. 31.87 KN/m
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