A post-tensioned concrete beam is prestressed by means of three cables each 100 mm2 area and stressed to 1100 MPa. All three cables are straight and located at an eccentricity of 50 mm. If modulus modular ratio (m) = 6 and stress in concrete at the level of steel (Fc) = 5 MPa, then what is the loss of stress in cables due to elastic shortening if all cables are simultaneously tensioned and anchoring?

A post-tensioned concrete beam is prestressed by means of three cables

1.	A post-tensioned concrete beam is prestressed by means of three cables each 100 mm2 area and stressed to 1100 MPa. All three cables are straight and located at an eccentricity of 50 mm. If modulus modular ratio (m) = 6 and stress in concrete at the level of steel (Fc) = 5 MPa, then what is the loss of stress in cables due to elastic shortening if all cables are simultaneously tensioned and anchoring?
A.	90 MPa
B.	60 MPa
C.	30 MPa
D.	0 MPa
Answer» E.

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