I modelled the pull out specimen in ABAQUS, I don't know how to define the bond behaviour between concrete and FRP bar?
when I was using the tangential behaviour between them and I tried to put friction coefficient equal to 0.3 for example and I applied 5mm displacement on FRP bar. I got very small forces, I mean the displacement happens at small pull out forces, it is not agree with experimental results, it is evidence that the tangential behaviour and normal behaviour doesn't work. some students advise me to use the cohesive behaviour, but how to calculate the stiffnesses, Knn, Ktt, Kss????
Hi Najia,
There are multiple ways to calculated, you can start by reading this paper, it's very close with what you are doing
Good luck
http://dx.doi.org/10.1016/j.tafmec.2007.11.005
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