Title:
Cumulative Damage Theory of Concrete Under Variable-Amplitude Fatigue Loadings
Author(s):
Byung Hwan Oh
Publication:
Materials Journal
Volume:
88
Issue:
1
Appears on pages(s):
41-48
Keywords:
amplitude; concrete; damage; fatigue tests; loads (forces); structures; variability; Material Research
DOI:
10.14359/2357
Date:
1/1/1991
Abstract:
A nonlinear cumulative damage theory that can model the effects of the magnitude and sequence of variable-amplitude fatigue loadings is proposed. The concrete beam specimens are prepared and tested in four-point flexural loading conditions. The variable-amplitude fatigue loadings in two and three stages are considered. The present experimental study indicates that the fatigue failure of concrete is greatly influenced by the magnitude and sequence of applied variable-amplitude fatigue loadings. The linear damage theory proposed by Palmgren and Miner is not directly applicable to the concrete under such loading cases. The sum of the cumulative damage is found to be greater than 1 when the magnitude of fatigue loading is gradually increased and less than 1 when the magnitude of fatigue loading is gradually decreased. The proposed nonlinear damage theory, which includes the effects of the magnitude and sequence of applied fatigue loadings, allows more realistic fatigue analysis of concrete structures.