Ultra-high-performance fiber-reinforced concrete flat slabs' punching shear resistance as a function of drop panel thickness

Document Type : Original Article

Authors
Twana Ali Muhammed
Karim F. R.
Civil Engineering Department, Engineering College, University of Sulaimani, Sulaimani, Kurdistan Region-Iraq
10.24271/psr.2024.189755
Abstract
Ultra-high-performance concrete including fibers (UHPFRC) is used to build skyscrapers, towers, and bridges.This type of concrete may have smaller skeletal components than normal concrete. However, flat slabs are thicker than reinforced concrete slabs. Brittle punching shear failure may happen rapidly and abruptly in flat slabs. The punching load was applied to four two-way internal UHPFRC-supported flat slabs: three reinforced concrete flat slabs with 10mm, 14mm, and 18mm drop panels and one control reinforced concrete slab without drop panels. The drop panel thickness enhanced punching shear resistance by 40% at fracture load and 48% at ultimate stress. In addition, deflection, shear strain at the concrete surface, strain in reinforcement, rotation at supports, and fracture inclination angles between top and bottom fibers improved by 30%, 316 percent, 74%, 385 percent, and 1.01 percent at peak load, respectively.
Keywords
Flat slabs
Micro steel fibers
Punching shear resistance
Thickness of drop panels
and UHPFRC
Crossmark
Subjects
Passer Journal of Basic and Applied Sciences
Volume 6, Special Issue
Proceedings of the 4th International Conference on Recent Innovation in Engineering ICRIE 2023, University of Duhok, College of Engineering, 13th – 14th September 2023
January 2024
Pages 513-522