Dynamic bond behavior of fiber reinforced plastic anchor post-installed low-strength concrete under different strain rates

To investigate the bond-slip behavior of post-installed adhesive FRP anchor in concrete (PIA-FRPA-C) under different strain rates. This paper first compares and analyzes the influence of adhesive type and FRP anchor material type on the bond behavior of specimens through pull-out experiments. Then, a study is conducted on the pull-out performance of PIA-GFRPA-C with different strain rates and anchorage lengths using epoxy adhesive and glass FRP anchor combined with experiments and numerical simulations. The pull-out load slip curves and axial stress distribution characteristics of specimens under different strain rates and anchorage lengths are analyzed, the stress transfer mechanism and failure mechanism of the specimens are revealed, and the dynamic increase factor of the average dynamic bond strength and slip of the specimens are determined. An average dynamic pull-out load prediction formula and an average dynamic bond-slip model are proposed and established. This study can provide a basis for improving the dynamic mechanical properties of concrete structures.