Abstract—In order to predict the post-cracking tensile
behavior of fiber reinforced concrete, it is necessary to evaluate
the fiber orientation factor which indicates the number of fibers
bridging a crack. For investigation of fiber orientation factor on
a rectangular section, in this paper, dog-bone fiber reinforced
concrete specimens were prepared with the variables of
concrete compressive strength, rectangular cross-section size,
fiber type, and fiber volumetric ratio. After direct tension tests,
the fiber orientation factor could be evaluated through counting
the number of fibers on a crack. From the test results, it was
investigated that the fiber orientation factor was larger than 0.5
which is generally adopted for large members, as fibers
distribution is affected by the specimen size. For rational
prediction of the fiber orientation factor on a rectangular
concrete section, a simple model was derived from the Diverse
Embedment Model (DEM), which is a rigorous model to predict
the tensile behavior of steel fiber reinforced concrete. From the
comparison of the measured data and the predicted values, it
was found that the actual fiber orientation factor was well
predicted by the proposed model.
Index Terms—Fiber orientation factor, fiber reinforced
concrete, rectangular cross-section, steel fiber.
S. C. Lee is with KEPCO Nuclear Graduate School, Ulsan, South Korea
(e-mail: sclee@kings.ac.kr).
J. H. Oh is with the Office of Offshore Windpower Promotion, KETEP,
and Seoul in South Korea (e-mail: ffjung45@gmail.com).
J. Y. Cho is with the Dept. of Civil and Environmental Engineering, Seoul
National University, Seoul, South Korea (e-mail: jycho@snu.ac.kr).
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Cite: Seong-Cheol Lee, Jeong-Hwan Oh, and Jae-Yeol Cho, "Fiber Orientation Factor on Rectangular Cross-Section in
Concrete Members," International Journal of Engineering and Technology vol. 7, no. 6, pp. 470-473, 2015.
