Effect of Impact Load on the Performance of Concrete Slabs Reinforced by CFRP Bars

Abstract

Using FRP bars in the concrete structures under harsh environment produces extension of those service life and dropping of the cost of their lifecycle. This study investigated the influence of slab thickness, material of rebar, arrangement of reinforcement and mass’s dropped on the dynamic behavior of RC slabs by using laboratory experiments. Seven specimens 1550×1550 mm dimension with two thickness 120 and 150mm, single control specimen reinforced with steel bars and six specimens reinforced by CFRP bars were experimentally investigated under sequential dropping-weight ranged from 50 to 150kg, it was a rigid steel projectile, used to apply impacting load. 2.5m was the height of dropping. For estimated penetration depth, three empirical formulas have been used, ACE formulae was preferable predictor than other formulas. Different codes were used to calculation punching shear capacity and critical velocity of perforation and compared the experimental results with these codes. The experimental results showed that the shear properties of slabs have a significant effect in their general behavior. And preferable performance in FRP slabs than slabs reinforced with steel can be achieved which considering high strength and corrosion resistance of this material, which makes it a suitable choice for reinforcing materials.

Behavior of Reinforced Lightweight Concrete Slab with Initial Cracks

“…There was a gradual decrease as the damage progressed because the concrete fragments were crushed to varying degrees before repair. This is similar to what was obtained from previous researchers Atefatdoost et al (2022) [21], Abed and Medhlom (2023) [22] and Shabestani et al (2022) [43]. They found that the most optimal array of the retrofitting material increases the capacities for two-way slabs by 18-30%.…”

“…Researchers Golham and Al-Ahmed (2024) [20] say that adding CFRP strips to concrete slabs with holes makes them more robust and able to handle more weight. It was found that CFRP laminates changed the strength and breakdown mode of the slabs, which is similar to what Abed and Medhlom found in 2023 [21]. All of our results together show that CFRP sheets might make thin concrete slabs much more potent when they are pulled apart.…”

“…It would be mutually beneficial. Previous researchers Atefatdoost et al (2022) [21], Abed and Medhlom (2023) [22], and Shabestani et al (2022) [43] obtained identical results. This technique is effective for repairing the mentioned slabs.…”

Determination of energy damping upon impact load in reinforced concrete sandwich plates with different core geometries

“…The results revealed that the plates reinforced with 75mm GFRP strips were more effective in mitigating the damage volume ratio compared to 50mm GFRP strips. [13] investigated the dynamic behavior of reinforced concrete slabs, slab thickness, rebar material, and reinforcement arrangement, and the effect of falling mass.…”