Critical assessment of the international estimates for relaxation losses in prestressing strands

Koretsky, A. V and Pritchard, R. W Critical assessment of the international estimates for relaxation losses in prestressing strands. St Lucia: Department of Civil Engineering, University of Queensland, 1981.

Attached Files (Some files may be inaccessible until you login with your UQ eSpace credentials)
Name Description MIMEType Size Downloads
Read with bookreader  TA1_U4956_NO25.pdf Full text Click to show the corresponding preview/stream application/pdf 4.14MB 82
Author Koretsky, A. V
Pritchard, R. W
Title Critical assessment of the international estimates for relaxation losses in prestressing strands
Place of Publication St Lucia
Publisher Department of Civil Engineering, University of Queensland
Publication year 1981
Sub-type Other
Series Research report (University of Queensland. Dept of Civil Engineering) ; no.CE 25.
Language eng
Total number of pages 29
Year available 1981
Subjects 290800 Civil Engineering
Formatted Abstract/Summary

Synopsis


This report exposes significant variations in the techniques of measuring relaxation losses in prestressing strands and in the relaxation values recommended by the Australian and International Standards and Design Codes. A specially designed test frame is reported and its capabilities are demonstrated on a series of twenty-four relaxation tests. It is concluded on the basis of the test data obtained that test equipment should be more rigidly specified and standardised and that modifications are required to the current methods of estimating the magnitude of the strand relaxation. Modifications to the Australian Standards are suggested. Areas for particular emphasis are test methods, relaxation losses immediately after stressing, isothermal relationship between the relaxation values at 1000 hours and at ultimate and the time dependent relaxation relationships when steam curing is employed.  

Keyword Stress relaxation -- Measurement
Q-Index Code AX
Q-Index Status Provisional Code
Institutional Status UQ

 
Citation counts: Google Scholar Search Google Scholar
Access Statistics: 152 Abstract Views, 98 File Downloads  -  Detailed Statistics
Created: Thu, 16 Aug 2012, 10:15:19 EST by Mr Lachlan Wong on behalf of The University of Queensland Library