Document Type : Original Article

Authors

• Twana Ali Muhammed
• Karim F. R.

Civil Engineering Department, Engineering College, University of Sulaimani, Sulaimani, Kurdistan Region-Iraq

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

Main Subjects

• Civil engineering