Abstract
AbstractThe strength and behavior of fiber reinforced concrete (FRC) members subjected to torsion has received little attention in the literature. The primary objective of including fibers in concrete is to bridge cracks once they form, and in doing so, provide some post‐cracking resistance to the otherwise brittle concrete. This and the accompanying paper that follows present the results of a comprehensive experimental and analytical study aimed at describing the behavior and strength of FRC members subjected to torsion. In this paper, results are presented on large scale pure torsion tests which have been conducted on eighteen 2.7 m long by 0.3 m wide by 0.3 m high beams with varying transverse and longitudinal reinforcement ratios along with varying steel fiber types and dosages. The results of this study demonstrates that the addition of steel fibers significantly increases the stiffness, rigidity and the maximum resisting torque and maximum twist when compared to the same specimen without fibers. The addition of fibers substantially reduced crack widths and crack spacings induced by torsion. The complementary behavior of specimens containing fibers and stirrups is explored along with a critical discussion on members containing low amounts of conventional longitudinal and/or transverse reinforcement.
Highlights
Discussion on this paper must be submitted within two months of the print publication
This paper describes and reports on an experimental study where eighteen large-scale fiber reinforced concrete beams were tested in pure torsion
According to the de Saint-Venant's (DSV) theory, the expected elastic torsional rigidity (KDSV) is equal to: the mean value of initial elastic rigidity (i.e., Kel,exp,mean = 18,155 kNm2/rad [CV = 12%]) exhibited by the 16 specimens not manufactured with PC1
Summary
Discussion on this paper must be submitted within two months of the print publication. Despite the wider community appreciating that the presence of fibers increases the capacity of reinforced concrete in resisting torsion, as experimentally demonstrated by several research programs,[29,30,31,32,33,34,35] design guidelines are unavailable to the practicing engineer To that end, this and the accompanying paper[36] present the results of a comprehensive experimental and analytical study aimed at describing the behavior and strength of SFRC members subjected to torsion. The specimens within the test series had varying transverse and longitudinal reinforcement ratios along with varying steel fiber types and dosages. Coefficient of variation reported in round brackets (CV%). aCalculated according to Eurocode 2. bFRC classification according to fib Model Code 20101
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