External Reinforcement of Wooden Beam Structures with Carbon Fiber Composite Materials

The object of the study is wooden beam structures strengthened by external reinforcement of composite materials based on carbon fiber. This work aims to analyze the distribution of axial strains along the height of the cross-section of a strengthened wooden beam. Method. As part of the experimental study, models of wooden beams strengthened with composite material were tested for static bending. The axial strains of the wooden beam were measured using strain gauges at each loading stage during the testing process. The theoretical values of axial strains at different points along the height of the cross-section were calculated. The cross-sectional characteristics of a reinforced wooden beam were determined for a composite section made of other modulus materials using the reduced section method. Results. The dependence of the change of the strength of wooden beam structures when varying both the parameters of the cross-section geometry and the parameters of external reinforcement is obtained. Diagrams of axial strains at different points along the height of the cross-section were constructed at each stage of sample loading based on the results of the obtained experimental data. The strength increase using the reinforcement system is assessed based on the analysis of tests of reinforced wooden beams and control samples that are not subject to reinforcement. A comparison of the theoretical and experimental values of axial strains of wooden beam structures strengthened by external reinforcement of composite materials based on carbon fiber has been made.