A prestressed hollow box cross section is shown in the figure. The area of prestressed reinforcement in the tension zone is 1148 mm2. Use grade 270 for seven wire-strand tendons. fpy = specified yield strength of tendons fpu = specified tensile strength o pre stressing tendons fse = effective prestress after losses fse = 1022 MPa Aps = 1148 mm2 fpy = 0.95fpu fc’ = 34.5 MPa fpu = 1860 MPa a. Compute the Yp factor. b. Compute the stress in prestressed reinforcement at nominal strength. c. Compute for the design moment capacity. d. Compute the effective pre stressing force after losses of stress e. Compute the depth of the compression block. f. Compute the pre stressing steel ratio.

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