Testing and analysis on creep behavior of post-installed reinforcing bar system

Existing research has focused on the performance of post-installed embedment systems under sustained loading conditions. This study performed 90-day sustained loading tests on post-installed systems to investigate the effects of stress levels, rebar diameter, concrete strength, embedment depth, and surface profile. The study established the progression characteristics of creep deformation in post-installed systems under sustained loading, evaluated convergence trends, and determined the limit values of total creep deformation over the 90-day period. It also examined the effects of rebar diameter and stress levels on long-term creep behavior. Furthermore, a quantitative analysis assessed the impact of concrete strength and embedment depth relative to rebar diameter on the bonding and anchorage capacity of the post-installed systems. The results indicate that increasing stress levels and loading durations lead to greater creep deformation, while deformed bars reduce creep deformation and enhance bonding performance compared to smooth round bars.