The prestressed I beam shown in cross section is pre tensioned using seven ordinary strands grade250 (fpu = 1728 MPa) carrying an effective prestress fpe = 988 MPa, fpy =1480 MPa.%3D3000.85fc'150 a300440600(d-a2)300T=Aps fpsAps =650 mm2Total depth of beam = 600 mmDistance from center to tendons to the top of the beam = 440 mmAps = 650 mm²%3DAverage flange thickness = 150 mmWidth of flange = 300 mm%3DThickness of web = 100 mm%3Dfc' = 27.6 MPaDetermine the value of the stress in the prestressed reinforcement at nominal strength. (MPa)

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Determine the value of the stress in the prestressed reinforcement at nominal strength. (MPa)

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

The prestressed I beam shown in cross section is pre tensioned using seven ordinary strands grade
250 (fpu = 1728 MPa) carrying an effective prestress fpe = 988 MPa, fpy =1480 MPa.
%3D
300
0.85fc'
150 a
300
440
600
(d-a2)
300
T=Aps fps
Aps =650 mm2
Total depth of beam = 600 mm
Distance from center to tendons to the top of the beam = 440 mm
Aps = 650 mm²
%3D
Average flange thickness = 150 mm
Width of flange = 300 mm
%3D
Thickness of web = 100 mm
%3D
fc' = 27.6 MPa
Determine the value of the stress in the prestressed reinforcement at nominal strength. (MPa)

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