Title:
Fatigue Life Distributions of Concrete for Various Stress Levels
Author(s):
Byung Hwan Oh
Publication:
Materials Journal
Volume:
88
Issue:
2
Appears on pages(s):
122-128
Keywords:
beams (supports); concretes; fatigue; fatigue life; stresses; probability theory; Weibull distributions (density); Materials Research
DOI:
10.14359/1870
Date:
3/1/1991
Abstract:
Presents a study of the fatigue life distributions of concrete for various levels of applied stresses. An experiment is conducted to obtain the fatigue lives of concrete at various given stress levels. The concrete beam specimens are tested in four-point flexural loading condition. Three different levels of applied fatigue stresses are considered. The present study indicates that the probabilistic distributions of fatigue life of concrete depend on the level of applied fatigue stress. The shapes of the Weibull distribution to that the fatigue life of concrete are different for different levels of applied stresses. This effect must be properly taken into account in realistic fatigue reliability analysis to secure adequate fatigue resistance of concrete structures. It is also shown that the graphical method, the method of moment, and the method of maximum likelihood estimation yield very similar values of distribution parameters for the present fatigue data. It is found that the shape parameter of the Weibull distribution for the fatigue life of concrete ranges from 2.0 to 4.0 depending on the level of applied fatigue stress.