Title:
Effects of Friction and Slip-Back on Stresses in Post-Tensioning Tendons
Author(s):
J.F. Stanton
Publication:
Symposium Paper
Volume:
231
Issue:
Appears on pages(s):
145-160
Keywords:
anchorage set; friction; post-tension; prestress loss
DOI:
10.14359/14925
Date:
10/1/2005
Abstract:
In post-tensioned systems, friction during stressing and slip-back due tosetting the wedge anchors cause loss of prestress. If the tendon is long or containssharp curvatures, these losses can be significant. This paper summarizes methods forcalculating the losses and provides an evaluation of the numerical coefficientssuggested by ACI 318-05 for friction. Equations are provided where closed formmethods are possible, and numerical methods are outlined for other cases.