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Residual flexural strengths of steel fiber reinforced concrete with multiple hooked‐end fibers
Author(s) -
Venkateshwaran Akshay,
Tan Kiang Hwee,
Li Yi
Publication year - 2018
Publication title -
structural concrete
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.912
H-Index - 34
eISSN - 1751-7648
pISSN - 1464-4177
DOI - 10.1002/suco.201700030
Subject(s) - flexural strength , fiber reinforced concrete , materials science , structural engineering , deflection (physics) , residual , composite material , three point flexural test , bending , fiber , residual strength , engineering , mathematics , physics , optics , algorithm
This paper presents the results of 3‐point bending tests on 69 prenotched steel fiber reinforced concrete ( SFRC ) prisms conducted in accordance with EN 14651 to obtain the stress versus crack‐mouth‐opening displacement curves. SFRC prisms with fiber content greater than 20 kg/m 3 and containing multiple hooked‐end fibers were found to exhibit deflection hardening behavior in bending after first crack. Based on the test results, empirical models to determine the residual flexural stresses are established through multiple regression analysis and further validated with test results available in the literature. The residual flexural strengths were found to be proportional to the reinforcing index, the square root of concrete compressive strength, and the square of the number of hooks at the fiber ends. Size effect is accounted for by introducing a factor which is a function of the fiber length. The empirical equations for the residual flexural strengths enable the use of Model Code 2010 constitutive relation for SFRC in tension without resorting to prism tests.