An I shaped prestressed concrete beam spanning 30 m has an effective prestress (just after transfer) of 3000 kN at an eccentricity of 75 mm at midspan cross-section. Calculate the stresses at midspan in the extreme fibres. Given the following data : Area of cross-section = 0.42 m2 Moment of inertia = 0.1433 m4 Height of the beam = 1600 mm %3D C.G. of the section from the bottom = 890 mm = 0.202 m3 Ziop = 0.161 m3 Zbottom Density of concrete = 25 kN/m3 %3D
An I shaped prestressed concrete beam spanning 30 m has an effective prestress (just after transfer) of 3000 kN at an eccentricity of 75 mm at midspan cross-section. Calculate the stresses at midspan in the extreme fibres. Given the following data : Area of cross-section = 0.42 m2 Moment of inertia = 0.1433 m4 Height of the beam = 1600 mm %3D C.G. of the section from the bottom = 890 mm = 0.202 m3 Ziop = 0.161 m3 Zbottom Density of concrete = 25 kN/m3 %3D
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:An I shaped prestressed concrete beam spanning
30 m has an effective prestress (just after transfer)
of 3000 kN at an eccentricity of 75 mm at midspan
cross-section. Calculate the stresses at midspan
in the extreme fibres. Given the following data :
Area of cross-section = 0.42 m2
Moment of inertia = 0.1433 m4
Height of the beam = 1600 mm
%3D
C.G. of the section from the bottom = 890 mm
= 0.202 m3
top
= 0.161 m3
Zbottom
Density of concrete = 25 kN/m3
%3D
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