Prestressed Concrete - A Simplified Method for Loss Consumption


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Title: Prestressed Concrete - A Simplified Method for Loss Consumption

Author(s): H. N. Grouni

Publication: Journal Proceedings

Volume: 70

Issue: 2

Appears on pages(s): 108-114

Keywords: creep properties; ductility; prestressed concrete; prestress loss; relaxation; shrinkage; strains; stress relaxation; structural design.

Date: 2/1/1973

Recent code revisions in prestressed concrete coupled with stress-time dependent losses have emphasized the need for a more direct procedure for evaluating prestress losses. The method presented here is simple and fast. It yields results with an accuracy comparable to that obtained by a detailed iterative procedure. The basic relaxation formula is evaluated for various concrete strains to conform to the actual behavior of the prestressed unit. Prestress loss expressions are reduced to their simplest form. Computations are further simplified by use of nomograms.