Request for Help with Element Stress Output in Corner Node Elements

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amb_1
Posts: 63
Joined: Wed Jun 08, 2022 11:32 am

Request for Help with Element Stress Output in Corner Node Elements

Post by amb_1 » Tue Apr 22, 2025 2:44 am

Dear STKO Team,

I am writing to request your assistance with a problem I'm encountering in my axial compression model.

I have successfully set up a model to output results for corner nodes. However, I'm experiencing difficulties when trying to record stress data for corner node elements. Despite trying various approaches, I cannot properly capture the stress in these elements.

I've attached my code and relevant details below for your reference. Could you please review this and advise on where the issue might be?

Thank you for your time and assistance.

Best regards,

Monace
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STKO Team
Posts: 3066
Joined: Tue Oct 29, 2019 8:45 am

Re: Request for Help with Element Stress Output in Corner Node Elements

Post by STKO Team » Wed Apr 23, 2025 8:08 am

Isn't it easier to extract stress/strain data using the Extract Chart Data feature in STKO?
extract.png
extract.png (553.99 KiB) Viewed 3233 times
If you want to manually use a recorder, you have to deal with mesh partitioning

amb_1
Posts: 63
Joined: Wed Jun 08, 2022 11:32 am

Re: Request for Help with Element Stress Output in Corner Node Elements

Post by amb_1 » Sun Apr 27, 2025 5:31 am

Dear STKO Team,

Thank you for your continued support. I appreciate the assistance you've provided thus far.

Regarding my current issue, I've been trying to record displacement and acceleration data through manual node recording, which has been successful. However, I'm encountering problems when attempting to record stress and strain values using elements with the ASDConcrete3D constitutive model.

Interestingly, the same recording code works perfectly when used with the PDMY02 constitutive model for liquefaction analysis, but fails to record the corresponding information when I switch to the ASDConcrete3D model.

I suspect there might be an issue with my recording code that's specific to the ASDConcrete3D implementation. Could you please help me review and modify my code to properly record stress and strain data for this constitutive model?

I would greatly appreciate your expertise in resolving this issue.

Thank you in advance for your assistance.

Best regards,

STKO Team
Posts: 3066
Joined: Tue Oct 29, 2019 8:45 am

Re: Request for Help with Element Stress Output in Corner Node Elements

Post by STKO Team » Tue Apr 29, 2025 8:07 am

This is wrong

Code: Select all

material 26 stress
This is fine

Code: Select all

material 1 stress
In OpenSees the number after the material keyword is the 1-based index of the gauss point. (and your material doesn't have 26 gauss points)

amb_1
Posts: 63
Joined: Wed Jun 08, 2022 11:32 am

Re: Request for Help with Element Stress Output in Corner Node Elements

Post by amb_1 » Wed Apr 30, 2025 6:47 am

Got it, Thank you!

STKO Team
Posts: 3066
Joined: Tue Oct 29, 2019 8:45 am

Re: Request for Help with Element Stress Output in Corner Node Elements

Post by STKO Team » Wed Apr 30, 2025 8:07 am

You're welcome

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