Montaser, Wael, Ayman, Emad, Said, Mohamed, Hussein Khalil, Ayman and Shaaban, Ibrahim ORCID: https://orcid.org/0000-0003-4051-341X (2025) Punching shear of hybrid fiber reinforced concrete flat slabs. Structures, 82.

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Abstract

This study investigates the use of polyvinyl alcohol (PVA), steel, and glass fibers to enhance the punching shear capacity of flat slabs. These hybrid fibers in concrete mixes involve considering the unique properties and benefits of each fiber type in concrete. Eight slab specimens, with dimensions of 1100 mm× 1100 mm x 120 mm, were tested to failure under concentric loading conditions. Test results showed that the punching shear capacity of slab elements using three types of hybrid fibers (PVA, steel, and glass) was higher than those containing two types of hybrid fibers by a range of 11 %–32 %. The deflection of slabs containing three hybrid fibers decreased by 2 %–12 % while the stiffness increased by 9 %–23 % compared to those containing two types of fibers. On the other hand, the slabs containing two types of hybrid fibers (PVA and steel fibers) led to a punching shear capacity higher than that using one type of fiber by a range of 4 %–10 %, a reduction in deflection by 2 %–10 %, and an increase in stiffness by 15 %–33 %. The maximum punching capacity and energy absorption of slabs containing three hybrid fibers were higher than those of the control slab without fibers by 71.43 % and 118 %, respectively. The analytical study carried out using the Fib Model showed that the predicted results were in good agreement with the experimental results. However, the ACI-318 (2019) design equations did not provide accurate predictions of the punching shear capacity. It was found that adding the three hybrid fibers in the concrete mixes resulted in benefitting the studied concrete elements from the unique properties of each fiber type in concrete.

Item Type:	Article
Identifier:	10.1016/j.istruc.2025.110579
Additional Information:	Available here: https://doi.org/10.1016/j.istruc.2025.110579 ©2025. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords:	Flat slabs; Hybrid fibers; Polyvinyl alcohol fibers (PVA); Glass fibers; Steel fibers; Punching shear
Subjects:	Construction and engineering
Date Deposited:	10 Nov 2025
URI:	https://repository.uwl.ac.uk/id/eprint/14260

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