Diagonal tension performance of concrete panels reinforced with hooked end steel fibers. (1st December 2022)

• Record Type: Journal Article
• Authors: Carrillo, Julian; Murcia-Delso, Juan; Massone, Leonardo M.
• Is Part Of: Engineering structures. Volume 272(2022)
• Publication Date: 2022-12-01
• Subjects: Shear strength -- Concrete panels -- Steel fibers -- Failure modes -- Stiffness degradation -- Energy dissipation -- Diagonal tension; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2022.114981
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Shear behavior of concrete panels reinforced with hooked end steel fibers is assessed. Post-cracking shear resistance and toughness of panels increased with fiber dosage. Only those panels with a dosage of 60 kg/m 3 presented strain hardening. Crack widths in panels decreased with increasing dosage and number of hooked ends. Models to estimate the shear response of panels at four limit states are proposed. Abstract: The increase in strength of Steel Fiber Reinforced Concrete (SFRC) depends mainly on factors such as the dosage, aspect ratio and number of hooked ends of the fibers. Previous studies proposed models to estimate the flexural and shear strength of SFRC beams, but the shear behavior of SFRC panels has not been extensively studied. The study includes diagonal tension tests on concrete panels to assess the shear performance of SFRC. The experimental program comprises 19 square concrete panels having 600 mm side and 75 mm thickness, including three nominal dosages of steel fibers (20, 40 and 60 kg/m 3 ) and three different number of hooked ends (1, 1.5 and 2). The study proposes models to predict the shear strength and deformation capacity, stiffness degradation and toughness of SFRC panels with different number of hooked ends when subjected to diagonal tension. The models include four characteristic limit states of diagonal cracking, maximum residual strength, code-based acceptable degradation, and maximum deformation.