Title: Estimating Prestress Losses

Author(s): Paul Zia, H. Kent Preston, Norman L. Scott, and Edwin B. Workman

Publication: Concrete International

Volume: 1

Issue: 6

Appears on pages(s): 32-38

Keywords: beams (supports); creep properties; friction; post-tensioning; prestressed concrete; prestressing steels; prestress loss; pretensioning; shrinkage; stress relaxation; unbonded prestressing

DOI:

Date: 6/1/1979

Abstract:
Equations for estimating prestress losses due to various causes are presented for pretensioned and post-tensioned members with bonded and unbonded tendons. The equations are intended for practical design applications under normal design conditions as discussed in the commentary. Using the equations, sample computations are carried out for typical prestressed concrete beams selected from the literature. The comparison of the results shows fairly good agreement.