A prestressed hollow box cross section is shown in the figure. The area of prestressed reinforcement in the tension zone is 1148 mm2. Usegrade 270 for seven wire-strand tendons.fpy = specified yield strength of tendonsfpu = specified tensile strength o pre stressing tendonsfse = effective prestress after lossesfse = 1022 MPaAps = 1148 mm2fpy = 0.95fpufc' = 34.5 MPafpu = 1860 MPa600 mm125 mm350 mm125 mm125 mm700 mm500 mm125 mm50 mma. 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 stresse. Compute the depth of the compression block.f. Compute the pre stressing steel ratio.

solution data given fc' =34.5 MPa Ec= 4700×fc'Ec =4700×34.5 =27606.25 N/mm2→ for graded 270 , Es…

Answered: e strength o pre stressing tendons ess…

Engineering

Civil Engineering

e strength o pre stressing tendons ess after losses

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

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
600 mm
125 mm
350 mm
125 mm
125 mm
700 mm
500 mm
125 mm
50 mm
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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