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Title: Post-Cracking Web-Shear Response of Hollow Core Slabs with Low Steel Fiber-Volume Fractions

Author(s): Ernesto Hernández, Benjamin Matthews, Gabriele Granello, and Alessandro Palermo

Publication: Structural Journal

Volume: 119

Issue: 6

Appears on pages(s): 53-66

Keywords: particle tracking velocimetry; precast concrete; prestressed hollow core slabs; steel fiber-reinforced concrete (SFRC); web shear

DOI: 10.14359/51734793

Date: 11/1/2022

This paper investigates the effectiveness of steel fibers in low dosage or volume fraction, 0.17% and 0.34%, as a mean to enhance the post-cracking web-shear strength of precast hollow-core slabs. The experimental campaign includes 26 specimens, 200 and 300 mm thick, tested in three series. Series I and II investigated the influence of fiber-volume fraction. Series III focused on evaluating the interdependency between the prestressed strand transfer length and post-cracking web-shear strength. The shear performance was assessed in terms of: 1) post-cracking strength; 2) toughness index; and 3) crack width. The test results showed improvements in all three performance indexes: post-cracking web-shear and toughness indexes increased by up to 90% and 50%, respectively, at three times the cracking deflection, while crack widths decreased by down to 80% when using 0.34%. Despite the increase in the post-cracking web-shear strength, no increase in the peak shear strength was observed.


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