Reinforcement of steel beams using carbon fiber composites. Completion of the adhesive process under cyclic load

Abstract

Reinforcement of steel beams using carbon fiber composites. Completion of the adhesive process under cyclic load

Kondrateva E. V., Ribakova L.Y.

Incoming article date: 23.12.2025

A carbon fiber reinforced steel beam was tested, which was subjected to cyclic loads of varying intensity during bending during glue hardening and periodically tested in static mode to determine the increase in stiffness. Tests have shown that adhesion occurs at higher loads, the adhesion strength decreases, and when the shear stress in the adhesive layer is exceeded, adhesion does not occur. The flexibility of the adhesive layer also reduces the cross-section characteristics, but by no more than 7%. Lap shear tests performed on samples cut from reinforced beams confirmed the results of bending tests, showing that the greatest decrease in adhesion strength occurs at the ends of the beams, where the sliding and shear stresses are greatest.

Keywords: carbon fiber reinforcement, cyclic load, adhesive joint strength, lap shear test