GFRP Blast Retrofit of RC Columns

As-built and glass-fiber-reinforced polymer (GFRP)-retrofitted reinforced concrete columns were subjected to simulated blast loading using a shock tube. Retrofitting involved various configurations of longitudinal and transverse GFRP layers to enhance flexural and shear capacity. Retrofitting significantly increased the strength and stiffness of reinforced concrete flexural members and greatly improved blast response. Furthermore, the addition of transverse GFRP wraps led to enhancements in the debonding strain and behavior of longitudinal GFRP, as well as an increase in post-peak ductility of concrete.