4.A post-tensioned prestressed beam of span-length of 10 m has a rectangularsection 300 mm wide 800 mm deep. The beam is prestressed by a paraboliccable concentric at the supports and with an eccentricity of 250 mm at the centreof span. The cross-sectional area of high-tensile wires in the cable is 500 mm².The wires are stressed by using a jack at the left end so that the initial force inthe cable at the right end is 250 kN. Using the following data, calculate (a) thetotal loss of stress in the wires, (b) The jacking force required at the left end:Coefficient of friction for curvature effect = 0.55Friction coefficient for wave-effect = 0.003/mAnchorage slip at the jacking end = 3 mm

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total loss of stress in the wires, (b) The jacking force required at the left end:

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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Question

4.
A post-tensioned prestressed beam of span-length of 10 m has a rectangular
section 300 mm wide 800 mm deep. The beam is prestressed by a parabolic
cable concentric at the supports and with an eccentricity of 250 mm at the centre
of span. The cross-sectional area of high-tensile wires in the cable is 500 mm².
The wires are stressed by using a jack at the left end so that the initial force in
the cable at the right end is 250 kN. Using the following data, calculate (a) the
total loss of stress in the wires, (b) The jacking force required at the left end:
Coefficient of friction for curvature effect = 0.55
Friction coefficient for wave-effect = 0.003/m
Anchorage slip at the jacking end = 3 mm

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