problem with the tutorial

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joselito15
Posts: 8
Joined: Fri May 31, 2024 4:41 am

problem with the tutorial

Post by joselito15 » Sun Jun 23, 2024 4:26 am

I have the following problem with the second model of the tutorial "STKO E-Learning Course - Modeling of a Reinforced Concrete Frame Structure (webinar in English)", it gives me an error regarding the value of the concrete "Error: the fracture energy (Gf = 0.03) is too small or the characteristic length of the element (lch = 100) is too large.
The minimum Gf to avoid constitutive rollback is 0.0283".
I have used different values for the meshing, reducing the lch and the gf, but the error persists. I also applied a solution that proposes deactivating the self-regulation, but convergence problems are obtained. I attach the file and the images of the errors. I hope you can help me.
Attachments
Imagen1.png
Imagen1.png (67.8 KiB) Viewed 228 times
Imagen2.png
Imagen2.png (62.72 KiB) Viewed 228 times

STKO Team
Posts: 2309
Joined: Tue Oct 29, 2019 8:45 am

Re: problem with the tutorial

Post by STKO Team » Mon Jun 24, 2024 7:55 am

I don't have this problem with the model downloaded from the website. did you modify something? can you share your modified model?

kesavapraba
Posts: 348
Joined: Sat Mar 28, 2020 2:25 pm

Re: problem with the tutorial

Post by kesavapraba » Mon Jun 24, 2024 3:23 pm

Hi, Please also check if you modify the meshing (coarser mesh when compared to the default one from webinar) of the model this can happen.
:: With best wishes ::
Prabakaran Kesavan

joselito15
Posts: 8
Joined: Fri May 31, 2024 4:41 am

Re: problem with the tutorial

Post by joselito15 » Mon Jun 24, 2024 5:09 pm

attached worked model
Attachments
Wallduda.rar
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STKO Team
Posts: 2309
Joined: Tue Oct 29, 2019 8:45 am

Re: problem with the tutorial

Post by STKO Team » Tue Jun 25, 2024 8:13 am

You modified the material properties and made the fracture energies to small.
that's what the error is telling you

joselito15
Posts: 8
Joined: Fri May 31, 2024 4:41 am

Re: problem with the tutorial

Post by joselito15 » Fri Jun 28, 2024 10:54 pm

Could you tell me what properties to modify and what energy value to use to avoid the error.

joselito15
Posts: 8
Joined: Fri May 31, 2024 4:41 am

Re: problem with the tutorial

Post by joselito15 » Thu Jul 04, 2024 3:04 am

STKO Team wrote:
Tue Jun 25, 2024 8:13 am
You modified the material properties and made the fracture energies to small.
that's what the error is telling you
Could you tell me what properties to modify and what energy value to use to avoid the error

kesavapraba
Posts: 348
Joined: Sat Mar 28, 2020 2:25 pm

Re: problem with the tutorial

Post by kesavapraba » Thu Jul 04, 2024 6:36 am

Hi, Please refer to the following article (page. 11, Equation.30). Theory of the material is discussed in the article. You can get the idea about the fracture energy settings.

Petracca, Massimo, Luca Pelà, Riccardo Rossi, Stefano Zaghi, Guido Camata, and Enrico Spacone. "Micro-scale continuous and discrete numerical models for nonlinear analysis of masonry shear walls." Construction and Building Materials 149 (2017): 296-314.
:: With best wishes ::
Prabakaran Kesavan

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