Abstract
The objective of the study is to investigate the bond performance between corroded steel bar and concrete subjected to dynamic loadings. A 3D refined simulation model is established, in which the geometrical shape of corroded rebar can be explicitly described. In addition, the shape variation of steel bars due to corrosion and the materials strain rate effect are also considered. In the simulations, a two-stage analysis (stage I: corrosion induced expansion, and stage II: dynamic relative slip) approach is utilized to explore the influences of corrosion and strain rate on the dynamic bond performance. Firstly, the corrosion expansion displacement is applied on concrete surface in contact with rebar to simulate the corrosion expansive behavior. After obtaining the damage pattern of concrete caused by corrosion and then taking this state as the initial condition, we apply a dynamic load on the loading end of corroded rebar to evaluate its dynamic bond behavior between the corroded rebar and concrete. A good agreement is obtained between the simulated results and the available experimental results on the failure patterns and corroded bond stress-slip curves. The combined effects and quantitative relationship between corrosion level and strain rate on the bond behavior are discussed. Also, the simulated bonding strength and peak slip present good consistency with the available test data. Furthermore, a modified bond stress-slip model considering the influence of corrosion level and strain rate on the bond strength as well as the peak slip is proposed.
Published Version
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