Title:
Flexural Fatigue Analysis of Steel Fiber-Reinforced Concrete
Author(s):
S. P. Singh and S. K. Kaushik
Publication:
Materials Journal
Volume:
98
Issue:
4
Appears on pages(s):
306-312
Keywords:
fatigue; fiber-reinforced concrete; stress.
DOI:
10.14359/10399
Date:
7/1/2001
Abstract:
The paper presents results of an investigation carried out to study the fatigue strength of steel fiber-reinforced concrete (SFRC). An extensive experimental investigation was planned in which 127 SFRC beam specimens 100 x 100 x 500 mm in size were tested under four-point flexural fatigue loading in an MTS closed loop electrohydraulic universal testing machine. The specimen incorporated three different volume fractions (that is, 0.5, 1.0, and 1.5%) of corrugated steel fibers 0.6 x 2.0 x 30 mm in size. One hundred and eight specimens were also tested under static flexure to obtain the static flexural strength of different batches of concrete prior to fatigue testing. The test data are used to generate the S-N curves and regression analysis is used to propose an equation to predict the flexural fatigue strength of SFRC. A probabilistic approach is used to predict the fatigue reliability of SFRC. The fatigue-life distributions of SFRC at a given stress level is shown to approximately follow the two-parameter Weibull distribution. The S-N relationships have been used to obtain the parameters of the Weibull distribution. Design fatigue lives have been obtained for different stress levels for SFRC corresponding to different probabilities of failure.