I'm running a reinforced concrete beam analysis model, all the constraints and loads are set. all the steel material properties are set.
I'm using SOLID65 for concrete elements, LINK180 for rebars (transverse and longitudinal) and SOLID185 for end supports (steel also).
However, This error started to arise whenever I define concrete properties using APDL commands and expressions like the following
[[
!Parameter values
nu=0.2 !POISSON'S RATIO
fcu=48 !UNIAXIAL COMPRESSIVE STRENGTH
fcut=fcu*0.1 !UNIAXIAL TENSILE STRENGTH
E=4400*sqrt(fcu) !MODULUS OF ELASICITY
fbc=49 !BIAXIAL COMPRESSIVE STRENGTH
open_sh=0.5 !OPEN SHEAR TRANSFER COEFFECIENT
closed_sh=0.85 !CLOSED SHEAR TRANSFER COEFFECIENT
!Define elastic properties of material
MP,EX,1,E !Define Elasticity Modulus
MP,NUXY,1,nu !Define Poisson's ratio
TB,CONCR,,,,0 !"0" means general properties for SOLID65, written in documentation
TBDATA,1,open_sh,closed_sh,fcut,fcu,fbc,0
TBDATA,7,0,0,0.3
]]
I've tried to define multilinear isotropic stress-strain curve, then added failure criteria but both trials have been with no avail.
The attached files are screenshots for the provided data.
It seems that the best bet is to pre-define the material model for concrete through the GUI (graphical user interface) before the execution of the APDL code (which is responsible for drawing the model itself).
______
The material must have three models in order to function.
1- Linear Isotropic
2- Concrete
3- Multilinear Isotropic
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