Title:
Flexural Fatigue Analysis of Steel Fibrous Concrete Containing Mixed Fibers
Author(s):
S. P. Singh, Y. Mohammadi, and S. K. Kaushik
Publication:
Materials Journal
Volume:
102
Issue:
6
Appears on pages(s):
438-444
Keywords:
failure; fatigue; fibers; stress
DOI:
10.14359/14807
Date:
11/1/2005
Abstract:
The paper presents a study on the fatigue strength of steel fiber-reinforced concrete (SFRC) containing mixed fibers. An experimental investigation was conducted to obtain the fatigue lives of SFRC at various stress levels. Two-hundred and sixty-nine SFRC beam specimens, 500 x 100 x 100 mm, were tested under four-point flexural fatigue loading to obtain the fatigue lives of SFRC specimens. One-hundred and eight complimentary static flexural tests were also conducted to obtain the static flexural strength prior to fatigue testing. The specimens incorporated 1.0, 1.5, and 2.0% volume fractions of corrugated mixed steel fibers of 0.6 x 2.0 x 25 mm and 0.6 x 2.0 x 50 mm in different proportions. The test data are used to generate S-N relationships, and equations have been proposed to predict the flexural fatigue strength of SFRC. The results indicate that the distribution of fatigue life of SFRC can be modeled by two-parameter Weibull distribution. The Weibull distribution has been employed to incorporate the failure probabilities into the fatigue life of SFRC. The fatigue lives corresponding to different failure probabilities have been calculated and the data so obtained have been used to generate Pf-S-N diagrams.