Pushover analysis (no softening)

[giom]

Hello everyone!

I'm using STKO to study the behavior of an infill mansonry walls. In addiction to vertical analysis, I want to do pushover analysis using "parallel displacement control". The analysis starts but it stops at about 80%. In particular, it seems that the analysis cannot compute the softening (as you can see in the monitor).

Can you help me to fix this problem? How can I find the solution?

Attached .sdc file, analysis text and monitor.

Giovanni Manco

[STKO Team]

Look at the output:

no contact.png (655.24 KiB) Viewed 1652 times

You forgot to assign Local Axes (that you correctly created) to the contact interactions. In this way they are using the default (Global) axes. Therefore, the bottom contact (which has a Z vector that correctly points toward the slave nodes) is working...

[giom]

Thank you for the answer!

Yes, I forgot to assign the local axes. I'm sorry.

However, now the horizontal analysis is not yet completed, rather it stops immediately already in elastic phase. In particular, a "warning" (related to ForceBeamColumn3D) is reported and analysis stops about to 3%.

What can I do to eliminate the "warning"? What is the reason?

Thank you very much for your work.

Giovanni

[STKO Team]

Try using the ASDShellQ4. For some reason when you reach the peak, the ShellMITC4 returns NAN