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Title:Relaxation Characteristics of Prestressing Strand
Author(s):Buckler, J.D.; Scribner, C.F.
Subject(s):Prestressed concrete
Steel -- Relaxation
Abstract:Relaxation characteristics of seven-wire prestressing strand were studied in this experimental investigation. Tests were conducted on both stress-relieved strand and low-relaxation strand. Two series of tests were carried out on both types of strand.. First, strand specimens were tested under conditions of constant strain. Second 3 stress in the strand specimens was reduced at a time of 24 hours after the initial tensioning3 then held at the strain accompanying their reduced stress for the remainder of the test. A quadratic equation was developed to predict losses of stress due to relaxation. The effects of stress reduction were accounted for by the use of a load reduction variable included in the quadratic equation.
Issue Date:1985-08
Publisher:University of Illinois Engineering Experiment Station. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Civil Engineering Studies SRS-520
Genre:Technical Report
Date Available in IDEALS:2009-10-30
Identifier in Online Catalog:860169

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