Title:
Fatigue of Bond
Author(s):
Gyorgy L. Balazs
Publication:
Materials Journal
Volume:
88
Issue:
6
Appears on pages(s):
620-630
Keywords:
bond (concrete to reinforcement); cyclic loads; damage; failure; fatigue (materials); slippage; Materials Research
DOI:
10.14359/1200
Date:
11/1/1992
Abstract:
Results of an experimental study of bond fatigue are presented. The data provide information applicable to the behavior of reinforcing bars embedded in concrete subjected to repeated or earthquake loads. Bond damage accumulates by increase in slip, but not linearly as predicted by the Palmgren-Miner hypothesis. The slip rate tends to decrease initially, then remains constant, and increases rapidly before pullout failure occurs. Under reversed cyclic loading, damage accumulates faster and bond strength is reduced, as is the related slip. A fatigue failure criterion based on the slip at which bond strength is reached under repeated loading is proposed.