Title:
Fatigue of Plain Concrete
Author(s):
Thomas T. C. Hsu
Publication:
Journal Proceedings
Volume:
78
Issue:
4
Appears on pages(s):
292-305
Keywords:
compression tests: compressive strength; concretes; cyclic loads;
fatigue (materials); fatigue tests, flexural strength; loading rate; strength;
stresses.
DOI:
10.14359/6927
Date:
7/1/1981
Abstract:
Fatigue strength of plain concrete is usually presented by the f-N curve (stress versus number of cycles). This curve has recently been extended to include the parameter R, where R is the ratio of minimum stress to maximum stress. This development results in a three-variable f-N-R relationship. This paper presents a more general four-variable f-N-T-R relationship for predicting the fatigue strength of concrete. This relationship incorporates the new dimension of T, which is the period of repetitive loading. Since T represents the rate of loading, and the product of T and N represents the duration of loading, this four-variable relationship simultaneously accounts for the time effect and the effect of loading rate. Based on the f-N-T-R relationship, two equations are proposed for the prediction of fatigue strength of concrete, one for the high-cycle fatigue and one for low-cycle fatigue. These equations have been substantiated by compressive and flexural tests reported in literature.