Contact elements and transient analysis

[miran]

Hi,

I am trying to perform a dynamic analysis using the new contact element in STKO. My model performs great for static loading, but not so great for dynamic loading. The solution converges, but the results are either way off or very noisy. It seems to work best with Krylow-Newton as the solver and TRBDF2 as the integrator.

Is there anything in particular I should be aware of regarding this element with respect to transient analysis? I have attached the file

pile_soil.zip

(2.56 MiB) Downloaded 237 times

.

PS! I am not using correct boundary conditions for this model as I just want to transient analysis to work for now.

[STKO Team]

1) the local axes -Z is not assigned to the bottom-contact interaction, so the column foot will not be in contact.
Try to see if that is the source of the issue.

2) It may happen that due to the penalty stiffness of the (many) contact elements, you will have some issues in dynamic analysis. Try to use an integrator that introduced numerical damping, such as Hilber-Hughes-Taylor with alpha = (0.67 for maximum damping)

[miran]

Thank you for the quick reply, Hilber-Hughes-Taylor did the trick!

[STKO Team]

You're welcome