Effects of Friction and Slip-Back on Stresses in Post-Tensioning Tendons

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Title: Effects of Friction and Slip-Back on Stresses in Post-Tensioning Tendons

Author(s): J.F. Stanton

Publication: Special Publication

Volume: 231

Issue:

Appears on pages(s): 145-160

Keywords: anchorage set; friction; post-tension; prestress loss

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.