A bridge is designed using a prestressed beam as shown. A beam with width b = 250 mm and %3D depth d = 450 mm is pre stressed by an initial force of 600 kN. Total loss of pre stress at service loads is 15%. Calculate the resulting final compressive stress at the top midspan of the beam %3D section if the pre stressing force is applied at the centroid of the beam section. The beam is carrying a total load of 15KN/m in a span of 8m. Ctop = 225 mm 450 e = 0 Cbot = 225 mm

A bridge is designed using a prestressed beam as shown. A beam with width b = 250 mm and %3D depth d = 450 mm is pre stressed by an initial force of 600 kN. Total loss of pre stress at service loads is 15%. Calculate the resulting final compressive stress at the top midspan of the beam %3D section if the pre stressing force is applied at the centroid of the beam section. The beam is carrying a total load of 15KN/m in a span of 8m. Ctop = 225 mm 450 e = 0 Cbot = 225 mm

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter12: Composite Materials

Section: Chapter Questions

Problem 12.7P: Estimate the transverse tensile strength of the concrete in Problem 12.6.

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Pressure and Stress

Question

A bridge is designed using a prestressed beam as shown. A beam with width b = 250 mm and
%3D
depth d = 450 mm is pre stressed by an initial force of 600 kN. Total loss of pre stress at service
loads is 15%. Calculate the resulting final compressive stress at the top midspan of the beam
section if the pre stressing force is applied at the centroid of the beam section. The beam is
carrying a total load of 15kN/m in a span of 8m.
Čtop = 225 mm
450
e = 0
Cbot = 225 mm
%3D
P = 600 kN
%3D

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