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Title |
An Analytical Study on the Tensile Behavior of UHPC According to Aspect Ratio and Orientation Distribution of Steel Fibers
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DOI |
https://doi.org/10.4334/JKCI.2017.29.6.581 |
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Keywords |
UHPC ; 인장강도 ; 균열폭 ; 섬유형상비 ; 섬유방향성 UHPC ; tensile strength ; crack width ; fiber aspect ratio ; fiber orientation |
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Abstract |
An analytical evaluation of the tensile behavior of UHPC depending on the diameter, length, and orientation distribution of steel fiber was performed in this study. The results indicated that the first cracking strength did not have a significant Influence of the variables, but tensile strength and crack width increased with smaller diameter and greater length of fiber at a constant fiber volume fraction. As for fiber orientation distribution, tensile strength was roughly proportional to the fiber orientation coefficient for each combination of fiber diameter and length. Crack width was also dependent on the combination, but it was constant regardless of the fiber orientation coefficient when it was higher than a critical value for each combination. Regarding the effect of fiber aspect ratio, tensile strength and crack width were proportional to this parameter when if it was more than 60. Fiber orientation had a more significant impact with a higher aspect ratio on the tensile strength, but the variation of crack width according to the fiber orientation was hardly affected by the aspect ratio. From the analytical results, finally, a new model that could consider the effect of fiber orientation distribution for tensile strength was suggested, and it was also proposed that crack width should be expressed as a function of the fiber aspect ratio with introduction of the critical fiber orientation coefficient.
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