Finite element modelling of bond-slip at anchorages of reinforced concrete members subjected to bending

The bond mechanism plays a decisive role when anchorage failure in a reinforced concrete (RC) member occurs. A refined model of bond-slip is therefore needed to analyse RC members by analytical or finite element (FE) modelling where the anchorage of reinforcement is critical, such as at a lapped-splice or in any situation where the strength of a bar is required to be developed to achieve its ultimate strength. This paper presents results of FE modelling of some experimental RC specimens with anchorage of deformed steel reinforcing bars in tension, including the cases of end development and lapped splices of bars in specimens subjected to bending. The FE modelling of the anchorage length specimens with bond-slip laws calibrated from experimental results was better able to predict the load-deflection behavior observed during experimental tests. A comparison of the results obtained using the calibrated bond-slip laws with those using conventional Federation Internationale du Beton bond-slip laws is made and discussion is provided on the effects of the anchorage lengths and bar diameters on the bond-slip relationships.