On the use of carbon fiber reinforced plastic for strengthening centrally compressed reinforced concrete columns
Abstract
On the use of carbon fiber reinforced plastic for strengthening centrally compressed reinforced concrete columns
Incoming article date: 06.11.2025Axial tests demonstrate that strengthening reinforced concrete columns with carbon fiber reinforced plastic (CFRP) significantly improves their performance through lateral restraint. The circular winding creates a triaxial compression effect, increasing concrete strength and load-bearing capacity. The slows of carbon fiber brittle fracture, increases ductility, suppresses microcracks, and improves seismic resistance. This technology is lightweight, corrosion-resistant, and has low operating costs.
The effectiveness of the reinforcement depends on the number of layers and the winding pitch. Cylindrical columns respond better to reinforcement; square columns require rounded corners (radius ≥20 mm) to prevent stress concentration. Two to three layers of CFRP are recommended. This method is particularly effective for columns with insufficient load-bearing capacity, low ductility, or in seismic conditions.Keywords: carbon fiber, reinforcement for reinforced concrete columns, compressive load bearing capacity