I'm modelling in Abaqus/CAE 2020 a cylindrical structure that has to be supported by multiple nonlinear springs at its shell surface. The nonlinear springs need to to represent the characteristics of soil layers, so that at each soil layer a new spring is needed.
My problem is that, as soon as a define more than one nonlinear spring, my simulation is aborted.
So far I have managed to run my simulation with one nonlinear spring defined as:
*Spring, elset=s1_py-spring, orientation=zyl, nonlinear
The problem arises as soon as a define a second nonlinear spring like this:
*Spring, elset=s2_py-spring, orientation=zyl, nonlinear
I get the following error message:
Error in job LBA: in keyword *CONFLICTS, file "LBA.inp", line 5795: Keyword *Conflicts is generated by Abaqus/CAE to highlight changes made via the Keywords Editor that conflict with changes made subsequently via the native GUI
Line 5795 is the line where I defined the second spring as nonlinear. This has to be done via keyword editing since nonlinear springs cannot be defined in the GUI. This problem does not come up when I do just one spring.
I can't use one spring since the springs model the soil at each layer.
Does anyone have experience modelling multiple nonlinear springs?
Any suggestions would be greatly appreciated.