Hello, I'm trying to model a culvert. The idea is to check the Axial, Moment and Shear in the structure at different backfill stages.
The script below is in the final condition but there are already some lines for the phases.
Even in the final stage only I'm struggling. Also I tried to excavate all the material and to check the arch only since I know the results I should get. But still no convergence (or no correct effort laws).

Hi, Could you please attach the script file instead of copying and pasting the commands into the message body?

Hello,

Yes of course, I have uploaded the scripts.

Best

I reviewed your model. You?re using very high cohesion and tensile strength values for the soil, which essentially makes it behave elastically.

Keep in mind that ADONIS uses a quasi-static (time-marching) technique to solve the problem. In cases with elastic materials and high stiffness, the model tends to oscillate around equilibrium, and it can take more than 100,000 steps to converge.

I recommend increasing the maximum number of steps in the settings from 100,000 to 1e6 (or higher) and allowing the analysis to run longer. As mentioned, this will significantly increase the runtime, but the equilibrium ratio should gradually decrease and eventually converge.

To increase the default step limit, use the following command:

set("steplimit",1000000)