2nd: A simply supported 14-m span beam, 300-mm wide by 540-mm deep, is pre- stressed by straight tendons with Aps = 774 mm² located 70 mm from the bottom at an initial prestress of 1.10 GPa. Calculate the concrete stress in MPa at the bottom fiber of the beam at midspan immediately after the tendons are cut. Write your answer in 2 decimal places only. Use unit weight of concrete 24 kN/cu.m. Sign convention is (+)

2nd: A simply supported 14-m span beam, 300-mm wide by 540-mm deep, is pre- stressed by straight tendons with Aps = 774 mm² located 70 mm from the bottom at an initial prestress of 1.10 GPa. Calculate the concrete stress in MPa at the bottom fiber of the beam at midspan immediately after the tendons are cut. Write your answer in 2 decimal places only. Use unit weight of concrete 24 kN/cu.m. Sign convention is (+)

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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2. The beam shown is prestressed using a bonded (stress relieved tendons) with a specified tensile strength of prestressing tendons fpy = 1350 MPa, and fc' = 35 MPa. The area of prestressed reinforcement in tension zone Aps = 1000 mm². The specified yield strength of prestressing tendons fpy = 1160 MPa. 0.85fc' C a 430 N.A. |(d-a/2) Ap=1000 T=Ap,Sps 250 a. Determine the value of the stress in prestressed reinforcement at nominal strength. b. Determine the value of the depth of the compression block. c. Which of the following gives the ultimate moment capacity of the prestressed beam.
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