What is the best method to define FRP(GFRP,CFRP,AFRP,BFRP) BARS as an internal reinforcement with CONCRETE BEAMS IN ABAQUS? This includes the interaction between FRP bars and concrete.
I am trying to model simply supported beam reinforced with longitudinal FRP(GFRP,CFRP.AFRP,BFRP) rebars and FRP stirrups. How to define the interaction between FRP and concrete( Not embedded I need other choice).
You can model the reinforcement as wire element in 3D model and use the embedded constraint for perfect bond between the reinforcement and concrete.
First FRP bars have small shear resistant. They only carry axial forces. So using truss or rebar elements is the best choice. Depending on your application, you need to carefully consider the bod between FRP and concrete as most likely the failure happen at the interface. What is exactly your application that you are trying to simulate.
Agree with most of what Hussien said above. Proper modelling of the bond behaviour between the internal FRP bars and concrete is important in some cases, but not in all cases. For example, if the loading capacity is concerned and the failure is flexural, the bond would have very little effect on the capacity. If stiffness (especially post cracking stiffness) and crack spacing is concerned, it becomes important. You might be interested in reading what we have done in modelling steel reinforced concrete as in the paper with DOI: 10.1016/j.conbuildmat.2010.11.101. Note obviously the properties for steel bars and their bond-slip behaviour with concrete need to be replaced by those of FRP bars.
Yes I have used truss element. but need to know how to define the interaction in the proper way to have accurate behaviour between FRP and concrete.
Yes Mr Jian, stiffness (especially post cracking stiffness) and crack spacing is concerned.
You may use either cohesive elements or spring elements to connect the two. Need proper definition of properties of these elements based on the adopted bond-slip model.
Any references you may suggest to have proper definition.. (eed proper definition of properties of these elements based on the adopted bond-slip model.) Mr Jian..
Mr Jian.. The bond slip model that you have used in that Journal article was for FRP strips..What model do you suggest for FRP rods..waht about COSENZA model...
the best way for bond-slippage is used translator connector element between steel nodes ans corresponding concrete nodes
Although it is likely to get the failure at the interface for FRP bars in concrete, however the reality is not as simple as this assumption. There are several factors that control the FRP/RC bond so depending on the concrete type,strength and composition the failure surface may move into the FRP bar itself by creating an internal failure surface. Through our experimental tests we also found that the shear strength of the FRP bar should not simply neglected and it contributes in completely changing the collapse mechanism of the structural element.
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