Fiber Orientation Factor on Rectangular Cross-Section in Concrete Members

Abstract

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.

Flexural Behavior of HPFRCC Members with Inhomogeneous Material Properties

“…Non-uniform distribution of fibers can also be another cause for variation in the crack-bridging behavior [33,34]. …”

Flexural Behavior of Steel Fiber Reinforced Concrete Beams: Probabilistic Numerical Modeling and Sensitivity Analysis

“…Residual tensile strength of SFRC depends on the fiber orientation and the number of fibers crossing the crack, both of which are uncertain as they depend on the distribution of fibers along the specimen [31]. Borges et al [5] and Tiberti et al [6] experimentally investigated the post-cracking behavior of SFRC and quantified the uncertainties in the residual tensile strength for different crack openings, different displacement application rates, and casting directions.…”

Experimental and Theoretical Analysis of Flexural Properties of Mortar Beam Reinforced with Coated Carbon-Fiber Textile

“…In particular, because the continuous fiber textiles are embedded in a fixed position, the fiber efficiency under tension after cracking is maximized. Therefore, TRM can solve the problems inherent in existing fiber-reinforced cementitious composites [10,11], which have variability in tensile behavior after cracking due to differences in the direction, length, and distribution of fibers exposed to cracks [19,20].…”