In addition, reinforcement of the concrete beam with a timber slab and two steel angles gave the highest load-bearing capacity of all the beams tested, which was 20% higher than the control specimen. The study results provided useful information for the development of environmentally beneficial sawdust concrete beams equipped with effective strengthening techniques for future applications. [PERSON] et al. [34] studied the effect of reinforcing timber beams with basalt-fiber-reinforced polymer (BFRP) bars and obtained an increase in the allowable load capacity of 16% on average. [PERSON] and [PERSON] [35] conducted experimental tests on bending of the reinforcement of wooden beams using very-high-strength steel ropes. Tests showed that external reinforcement of steel fibers resulted in a large increase in stiffness and bending strength. [PERSON] et al. [36] conducted research using steel bars to strengthen glulam beams. In their research, they achieved an increase in stiffness and improved mechanical properties. [PERSON] and [PERSON] [37] studied timber beams using steel plates. They obtained results comparable to those of fiber-reinforced polymers (FRP). In another study, [PERSON] et al. [38] strengthened wooden beams using composite materials based on natural fibers, hemp, flax, basalt, and bamboo. Based on the study, the use of natural fiber composites was found to be more effective for timber beams with inferior mechanical properties. In a subsequent study [39], bamboo scribes were added to timber beams [39], with gains in maximum load capacity ranging from 20% to 70% and stiffness from 40% to 160%. In CLT, small cracks can lead to loss of mechanical strength, while the use of cracks filled with other materials in engineered wood products may have the potential for design innovation and improved acoustic and thermal properties [40]. Due to its orthotropic nature, wood is a complex material and has limited analytical capabilities to describe its basic behavior. However, the existence of knots, cracks, or inclination of the grain also has an important impact on the behavior of the wooden structural element, especially when they are located in the tension zone because that is where the most damage can occur. In addition, the properties of wood may differ even within the same species; therefore, many parameters will need to be considered to fully describe the model. However, fibers have no meaning until they are connected to each other to create a durable load-bearing element. Their advantages are related to a highly organized internal structure or a low probability of structural defects. The most common fibers used to construct FRP rods are glass, carbon, aramid, and basalt. Please note that fibers differ in many properties related to production processes or types of particles. Aramid fibers are the lightest, carbon fibers are the most durable, glass fibers are the cheapest, and basalt fibers are the most resistant to high temperatures. Therefore, all fibers are characterized by a typically linear stress-strain relationship. Stresses and strains increase linearly with the applied load until failure. It is linear with different angles of inclination, which differ in elastic moduli (smaller than for steel). Therefore, it is proportional to the load capacity. It is known that the higher the modulus of elasticity, the greater the increase in load capacity. Composite bars have different strength characteristics than steel bars; therefore, in the calculation of both the ultimate limit state and the serviceability limit state, it will be necessary to make different design assumptions regarding safety conditions. Composite bars are linear elastic in nature. However, FRP bars do not have the ability or the possibility, beyond certain stresses, to introduce plastic reinforcement or redistribute internal forces, which distinguishes them from steel. In the same way, there is no increment of plastic deformation of the bars to determine the impending catastrophe.