Effect of Ultra-High-Performance Fibre-Reinforced Concrete Strip Thickness on the Punching Shear Performance of Reinforced Concrete Flat Slabs
DOI:
https://doi.org/10.70028/cpir.v2i1.84Keywords:
Flat Slab, Punching Shear Resistance, Strengthening Strips, UHPFRC, ConcreteAbstract
Design and construction errors or building function changes need strengthening concrete slab-column connections in flat slab systems. Increased flexural and shear capabilities enhance these connections' ultimate shear capacity. Due to its strength and longevity, ultra-high-performance fiber-reinforced Concrete (UHPFRC) reinforces structural sections. This study examines the punching behavior of column-slab connections of reinforced concrete flat slabs enhanced with externally bonded ultra-high-performance fiber-reinforced concrete strips. At the critical sections, UHPFRC strips of various thicknesses strengthened ten two-way slab specimens of three concrete types with compressive strengths of 20.8, 32.6, and 43.3 MPa. Before supporting the slabs on four opposing corners and shear-punching, the strips were pre-cast and attached to the tensile slab surface using epoxy. After strengthening reinforced concrete slabs with UHPFRC strips, the stiffness of the slab specimens at critical sections increased to resist punching shear load, and the slab failure mode changed from brittle to ductile. Normal-strength concrete (NSC) slabs benefit from externally bonded UHPFRC strips' punching shear resistance. This technology improves the ductile and robust structural durability and failure mode.
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Copyright (c) 2026 Ashti Sedeeq Ali, Ferhad Rahim Karim, Serwan Rafiq Khorsid (Author)
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