Numerical study on lateral-torsional buckling of PFRP channel beams under pure bending

Fiber-Reinforced Polymer (FRP) is a composite product composed of two parts of fiber and matrix. One of the most suitable methods for manufacturing composite materials is Pultrusion (PFRP). Pultrusion is a continuous process for the production of composite profiles. Its features include low weight, high tensile strength, corrosion resistance, thermal insulation and electrical insulation. In this article, the PFRP beams are modeled under different boundary conditions and pure bending loading in the Abaqus software .The lateral torsional buckling moment of the beams is obtained. Then, an analytical response is obtained through the equation in the Eurocode 3 Regulation, and this value is compared with numerical results. The results show that the critical buckling moment obtained from the modified equation Eurocode 3 has a reasonable accordance with the finite element analysis results. The results of the finite element analysis are higher than the modified equation of the regulation. The difference values between the two methods can be considered as a safe interval for calculating the critical buckling moment of pultrusion composite beams under pure bending. According to results, as slenderness increases, the critical buckling moment resulting from linear and nonlinear analysis and the modified equation of the Eurocode 3 regulation decreases.