Question

A simply supported symmetrical beam symmetrical I beam shown in cross section will be used on a 12 m simple span. Properties: Moment of Inertia Ic = 0.005 m^4 and Concrete Area Ac = 0.1135 m^2 The beam is to carry a super imposed dead load (considered sustained, not short term) of 10.97 kN/m in addition to its own weight of 2.68 kN/m. The beam will be pre tensioned with multiple seven wire strands with centroid at constant eccentricity of 200 mm. 600 e=200 The pre stress force Pi immediately after transfer will be 704 kN, after time dependent losses the force will be reduced to Pe = 598 kN. The design strength of the concrete fc' = 34.6 MPa and at the time of pre stressing the strength will be f'ci = 25.9 MPa Determine the flexural stress at the midspan section after all losses with full service load in place

          A simply supported symmetrical beam symmetrical I beam shown in cross section will be used on a 12 m simple span. Properties: Moment of Inertia Ic = 0.005 m^4 and Concrete Area Ac = 0.1135 m^2
The beam is to carry a super imposed dead load (considered sustained, not short term) of 10.97 kN/m in addition to its own weight of 2.68 kN/m. The beam will be pre tensioned with multiple seven wire strands with centroid at constant eccentricity of 200 mm.
600
e=200
The pre stress force Pi immediately after transfer will be 704 kN, after time dependent losses the force will be reduced to Pe = 598 kN. The design strength of the concrete fc' = 34.6 MPa and at the time of pre stressing the strength will be f'ci = 25.9 MPa
Determine the flexural stress at the midspan section after all losses with full service load in place

A simply supported symmetrical beam symmetrical I beam shown in cross section will be used on a 12 m simple span. Properties: Moment of Inertia Ic = 0.005 m^4 and Concrete Area Ac = 0.1135 m^2
The beam is to carry a super imposed dead load (considered sustained, not short term) of 10.97 kN/m in addition to its own weight of 2.68 kN/m. The beam will be pre tensioned with multiple seven wire strands with centroid at constant eccentricity of 200 mm.
600
e=200
The pre stress force Pi immediately after transfer will be 704 kN, after time dependent losses the force will be reduced to Pe = 598 kN. The design strength of the concrete fc' = 34.6 MPa and at the time of pre stressing the strength will be f'ci = 25.9 MPa
Determine the flexural stress at the midspan section after all losses with full service load in place

Added by Nathan S.

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