Tensile behavior of GFRP bar at quasi-static and high strain rate

Abstract

In order to better use GFRP bar in civil engineering applications, a clearer knowledge of its mechanical properties under static and dynamic loadings is necessary. In this study, quasi-static experiments were carried out on glass fiber and GFRP bars with different diameters. High strain rate experiments (102 ∼ 103s−1) were carried out on GFRP bars with a diameter of 6 mm. The results show that GFRP bar has size effect at quasi-static. The tensile strength, elastic modulus decrease with increasing diameter of GFRP bar. GFRP bar has strain rate effect. The tensile strength and maximum strain increase with increasing strain rates. The elastic modulus decrease with increasing strain rates. The distribution function of failure probability of GFRP bar is obtained by Weibull analysis. The difference between static tensile failure mode and high strain rate tensile failure mode of GFRP reinforcement is analyzed by SEM.