Mechanical characteristics of composite material manufactured by winding process

The study is aimed to increase durability and reduce costs in bridge construction through the use of fiberglass pipes manufactured by the filament winding process. Despite the successful use of fiber reinforced polymers (FRP) abroad, their application in Russia is limited due to the lack of regulatory framework and insufficient study of their mechanical properties. Through experimental tensile testing of fiberglass pipe specimens using strain gauges and a universal testing machine, key characteristics were obtained: tensile strength (200 MPa on average), elastic modulus (29.5–37.9 GPa), and Poisson's ratio (0.21–0.27). The material properties were found to be comparable to concrete and steel, which confirms its suitability for hybrid bridge superstructures. The peculiarities of the deformation behavior, including cracking and changes in the elastic modulus under repeated loading were revealed. The results of the study can be used to develop a regulatory framework and to design durable bridge structures, opening up perspectives for the expansion of composite applications in construction.