A rectangular concrete beam with width b= 280 mm and total depth h= 700 mm is post-tensioned using a single parabolic tendon with an eccentricity of 200 mm at midspan and Omm at simple supports. The initial prestress force P, = 1480 kN , and the effectiveness ratio R = 0.84. The member is to carry superimposed dead and live loads of 4.4 and 14.6 kN / m, respectively, uniform distributed over 12 m. Specified concrete strength f= 35 MPa, and at the time of transfer f= 28 MPa . Determine the flexural stress distribution in the concrete midspan (a) for initial conditions before application of superimposed load and (b) at full service load. Compare with the ACI limit stresses for Class U members.

A rectangular concrete beam with width b= 280 mm and total depth h= 700 mm is post-tensioned using a single parabolic tendon with an eccentricity of 200 mm at midspan and Omm at simple supports. The initial prestress force P, = 1480 kN , and the effectiveness ratio R = 0.84. The member is to carry superimposed dead and live loads of 4.4 and 14.6 kN / m, respectively, uniform distributed over 12 m. Specified concrete strength f= 35 MPa, and at the time of transfer f= 28 MPa . Determine the flexural stress distribution in the concrete midspan (a) for initial conditions before application of superimposed load and (b) at full service load. Compare with the ACI limit stresses for Class U members.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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