Researches I am currently working on the modeling of a Push-Out essay with two Concrete materials - Steel, particularly a screw and a concrete plate and I have unrealistic stress in concrete that exceed the maximum stress in the constituent model of concrete (Microplane with a Surface Cap Model Drucker - Prager). Below are the parts of the model and the boundary conditions.
Image 1 shows the parts of the model in with the boundary conditions and the applied loads.
The model consists of two concrete plates with two embedded screws attached to a type M Cold Formed Steel profile with a 2mm Thickness . The load is applied to this model as a displacement.
The connections in the model are:
Frictional: Between concrete and cold formed steel profile.
Frictional: Between the plate and the cold formed steel profile.
Bounded: Between the cold formed steel profile and the screw or stud.
Rough: Between the concrete and the screw or stud. The concrete parameters and commands can be viewed below: Coupled Damage-Plasticity Microplane Damage Output Element used CPT 217 ANSYS COMMANDS
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ET,MATID,217 KEYO,MATID,18,2
E = 21022 nu = 0.18 fuc = 43.7 fbc = 50.26 fut = 8.2 Rt = 2 D = 120000 sigVc = -60 R = 1 c = 2600 m = 2.5 gamt0 = 0 gamc0 = 0.000025 betat = 7000 betac = 5000
MP,EX,MATID,E MP,NUXY,MATID,nu
TB,MPLA,MATID,,,DPC TBDATA,1,fuc,fbc,fut,Rt,D,sigVc TBDATA,7,R,gamt0,gamc0,betat,betac
TB,MPLA,MATID,,,NLOCAL TBDATA,1,c,m ______________________________________________________________________________________________ Image 2 shows steel parameters.
Images 3, 4, 5 show the principal Stress in Concrete. You can observe the maximum, average and minimum stress of the concrete. It can be seen that in all the images it exceeds the maximum value to compression that is 43 MPa and are efforts that are concentrated in a part of the screw by the restrictions. I would appreciate some advice since the models I am working on have unrealistic stress and apparently the material does not behave according to the parameters defined in the concrete. The finite elements used in this model are CPT215 and SOLID185.
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