A 350mm x 600mm prestressed beam has a simple span of 20m. The beam uses stress relieved tendons with specified tensile strength f pu = 1862 MPa and an effective stress in prestressed reinforcement after allowance for all prestress losses f se = 1100 MPa. The area of prestress reinforcement in tension zone is A ps = 1800mm 2 applied 90mm above the bottom of the beam and fc’ = 35 MPa. a. Determine the reinforcement indices for the prestressed beam if it is not to be grouted (unbonded) after the application of the prestress. b. Determine the reinforcement indices for the prestressed beam if it uses bonded tendons. c. The safe ultimate moment capacity of the beam d. The safe live load that the prestress beam could carry.

A 350mm x 600mm prestressed beam has a simple span of 20m. The beam uses stress relieved tendons with specified tensile strength f pu = 1862 MPa and an effective stress in prestressed reinforcement after allowance for all prestress losses f se = 1100 MPa. The area of prestress reinforcement in tension zone is A ps = 1800mm 2 applied 90mm above the bottom of the beam and fc’ = 35 MPa. a. Determine the reinforcement indices for the prestressed beam if it is not to be grouted (unbonded) after the application of the prestress. b. Determine the reinforcement indices for the prestressed beam if it uses bonded tendons. c. The safe ultimate moment capacity of the beam d. The safe live load that the prestress beam could carry.

Steel Design (Activate Learning with these NEW titles from Engineering!)

6th Edition

ISBN:9781337094740

Author:Segui, William T.

Publisher:Segui, William T.

Chapter9: Composite Construction

Section: Chapter Questions

Problem 9.1.3P

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