Strengthening of corroded RC slab–column joints using thin-ply hybrid FRP under punching shear
Ahmed M. Gomaa, Manar A. Ahmed, Sherif A. Khafaga, Ehab M. Lotfy, Sally Hosny
TL;DR
This study explores how thin hybrid FRP materials can strengthen corroded concrete structures under shear stress, finding optimal configurations for effectiveness.
Contribution
The novel contribution is demonstrating that thin-ply hybrid FRP is more effective than single-material systems for punching shear strengthening in corroded RC joints.
Findings
Hybrid thin-ply FRP improved punching shear capacity more than single-material GFRP or CFRP systems.
Optimal strengthening was achieved with two hybrid layers (0.6 mm each) in a skewed strip layout.
Strengthening efficiency decreased from 50.77% at 5% corrosion to 24.76% at 30% corrosion.
Abstract
A comprehensive investigation into the punching shear (PS) strengthening behavior of corroded two-way reinforced concrete (RC) slabs using thin-ply glass/carbon hybrid FRP was conducted through an integrated experimental, numerical, and theoretical program. Eleven slab–column joints (SCJs) were cast and tested under monotonic loading to assess different external strengthening configurations. The experimental results indicated that hybrid thin-ply FRP improved PS capacity more effectively than single-material GFRP or CFRP systems within the tested conditions. Numerical analysis using ABAQUS was then carried out to evaluate the influence of strengthening parameters. The simulations showed that increasing the FRP layers beyond two, or thickness beyond approximately 0.6 mm, resulted in limited additional capacity due to premature debonding. The parametric study identified a skewed strip…
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Taxonomy
TopicsStructural Behavior of Reinforced Concrete · Concrete Corrosion and Durability · Structural Response to Dynamic Loads