The bond stress–slip law specified in the widely accepted Fédération Internationale du Béton (FIB) model code is principally based on results of pull-out tests on reinforcement anchored in concrete for a very short length. The bond mechanism affects the collapse load behavior of a structural member or parts of a structural member where anchorage of reinforcement is critical. The assumption of perfect bond between the concrete and reinforcing bar is often a sufficient assumption when modelling the ultimate behavior of a large reinforced concrete (RC) structure, but it is not of course appropriate when anchorage failure occurs. A comparison of the results obtained using the calibrated bond–slip laws with those using conventional Fédération Internationale du Béton bond–slip laws is made and discussion is provided on the effects of the anchorage lengths and bar diameters on the bond–slip relationships. 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.
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. 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. The bond mechanism plays a decisive role when anchorage failure in a reinforced concrete (RC) member occurs.
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