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 m2Moment of inertia =0.1433 m4Height of the beam = 1600 mmC.G. of the section from the bottom = 890 mmZtop=0.202m3Zbottom=0.161m3Density of concrete =25kN/m3

An I shaped prestressed concrete beam spanning 30 m has an effective p

1.	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 m2Moment of inertia =0.1433 m4Height of the beam = 1600 mmC.G. of the section from the bottom = 890 mmZtop=0.202m3Zbottom=0.161m3Density of concrete =25kN/m3
Answer» 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 $= 0.42 m^{2}$ Moment of inertia $= 0.1433 m^{4}$ Height of the beam = 1600 mm C.G. of the section from the bottom = 890 mm $Z_{t o p} = 0.202 m^{3}$ $Z_{b o t t o m} = 0.161 m^{3}$ Density of concrete $= 25 k N / m^{3}$

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