Loss of Prestress Due to Relaxation After Transfer


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Title: Loss of Prestress Due to Relaxation After Transfer

Author(s): H.N. Grouni

Publication: Journal Proceedings

Volume: 75

Issue: 2

Appears on pages(s): 64-66

Keywords: creep properties; post-tensioning; prestressed concrete; prestressing; prestressing steels; prestress loss; pretensioning; shrinkage; stress relaxtion; stress transfer; structural analysis.

Date: 2/1/1978

Expressions for direct computation of relaxation losses after transferin low relaxation and strress-relieved steels are presented. The expressions were derived by iterating the applicable pure relaxation formula with a time-related function defining the rate of plastic strains in concrete. The resulting expressions were reduced to a form comparable to those in recent codes.