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Title |
Reliability Analysis and Fatigue Models of Concrete under Flexural or Split Tensional Cyclic Loadings
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Keywords |
피로모델; 쪼갬인장; Weibull 분포; 적합도 검정; fatigue model; split tension; weibull distribution; goodness-of-fit test; pavement concrete |
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Abstract |
This paper compares the fatigue behaviors of concretes subjected to flexural and split-tensional loadings, and proposes the fatigue reliability models based on experimental results and reliability analysis. The fatigue tests were performed for the specimens of 150㎜×75㎜ split tensional cylinders and 150㎜×150㎜×150㎜ flexural beams under constant loadings at three levels (70, 80 and 90%) with 0.1 stress ratio, 20 Hz loading speed and sine wave. The reliability analysis on fatigue data was based on Weibull distribution of two-parameters. From fatigue test results, two criteria were proposed to reject the experimental fatigue data because of statistical variation of concrete fatigue data. Two parameters (α and u) of Weibull distribution were obtained using graphical method, moment method and maximum likelihood method. The probability density function(P.D.F) and cumulative distribution function(C.D.F) of the Weibull distribution for fatigue life of pavement concrete were derived for various stress levels using parameters, α and u. The goodness-of-fit test by Kolmogorov-Smirnov test was acceptable at 5% level of significance. Based on reliability analysis, a fatigue model for pavement concrete was proposed and compared from existing models.
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