Analysis did not converge

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sribeiro
Posts: 45
Joined: Tue Feb 28, 2023 7:25 am

Analysis did not converge

Post by sribeiro » Sat Mar 25, 2023 12:26 pm

Hi everyone!

I was preparing a fiber section model and for that I was using as a reference the video https://www.youtube.com/watch?v=0lLeIZpLwlQ&t=34s

However, when I run my model, the .exe window says it does not converge.

Can someone help me find error?
Attachments
bridge deck.scd.zip
(106.27 KiB) Downloaded 102 times
exe. window.png
exe. window.png (455.36 KiB) Viewed 1584 times

STKO Team
Posts: 2321
Joined: Tue Oct 29, 2019 8:45 am

Re: Analysis did not converge

Post by STKO Team » Tue Mar 28, 2023 7:55 am

Here's a fixed file:
bridge deck.zip
(106.63 KiB) Downloaded 93 times
It was singular from the beginning because you forgot to input -GJ (if in 3D you leave it as 0, your beam will be singular in torsion)
Now it will run for some steps and then it will stop converging because parts of your beam are crushing (and you did not put any steel in there):
crush.png
crush.png (69.46 KiB) Viewed 1541 times

sribeiro
Posts: 45
Joined: Tue Feb 28, 2023 7:25 am

Re: Analysis did not converge

Post by sribeiro » Tue Mar 28, 2023 11:27 am

Thank you very much!

Yes I didn't put any steel because the idea is to create an homogenised section (steel into concrete) for an easier analyses.
Do you think that will bring problems to the model and its results?

STKO Team
Posts: 2321
Joined: Tue Oct 29, 2019 8:45 am

Re: Analysis did not converge

Post by STKO Team » Wed Apr 05, 2023 7:37 am

You can do it. But you will have to define a uniaxial material that contains both concrete and steel accounting for their volume fractions. You can use the parallel uniaxial material for this

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