MOMENTS AND SHEARS IN SHEAR WALL

Hello! In this section we'll talk about the post processing module and the data visualization.
allano89
Posts: 70
Joined: Fri Mar 05, 2021 4:26 am

Re: MOMENTS AND SHEARS IN SHEAR WALL

Post by allano89 » Wed Nov 23, 2022 6:25 am

Dear STKO team
Thank a lot you are so helpful and kind. Thanks a lot, your help is fundamental.I get the backstay effect and the results are so close to the ETABS.

Now I modeled the whole structure of my research but I get this problem, please your help.
Attachments
error edificio grande.png
error edificio grande.png (52.59 KiB) Viewed 1158 times
model complete.png
model complete.png (163.38 KiB) Viewed 1158 times

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

Re: MOMENTS AND SHEARS IN SHEAR WALL

Post by STKO Team » Wed Nov 23, 2022 8:57 am

The error message is saying that the model is singular.
But without the SCD model, I cannot tell you the reason for it. Can you share it?

allano89
Posts: 70
Joined: Fri Mar 05, 2021 4:26 am

Re: MOMENTS AND SHEARS IN SHEAR WALL

Post by allano89 » Fri Nov 25, 2022 5:55 am

Thanks a lot by your concern
I could to solve that problem. But I had another problem Please whats the meaning about this mistake? Because the model continued running.
And how to get the moment-curvature of the shear walls thans a lot for your answers.
Best regards.
PD I´ve attached the new mistake and the model (please. once you download it could you erase it?)
Attachments
new mistake.png
new mistake.png (63.61 KiB) Viewed 1142 times
Last edited by allano89 on Tue Nov 29, 2022 2:04 am, edited 1 time in total.

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

Re: MOMENTS AND SHEARS IN SHEAR WALL

Post by STKO Team » Mon Nov 28, 2022 7:59 am

You're welcome!
But I had another problem Please whats the meaning about this mistake? Because the model continued running.
It's not a problem. It says that OpenSees had a convergence issue. Then the analysis loop written by STKO tries to reduce the time-step to allow convergence (it's because you chose Adaptive Time Step).

You can remove the attachment from your post

allano89
Posts: 70
Joined: Fri Mar 05, 2021 4:26 am

Re: MOMENTS AND SHEARS IN SHEAR WALL

Post by allano89 » Tue Nov 29, 2022 9:31 am

Thanks for your answer
I have the last quesion please. how to get the moment-curvature of the shear walls?
Best regards

STKO Team
Posts: 2068
Joined: Tue Oct 29, 2019 8:45 am

Re: MOMENTS AND SHEARS IN SHEAR WALL

Post by STKO Team » Thu Dec 01, 2022 9:06 am

At the moment you cannot do it because every element in opensees gives global forces as output, but not global deformations.
But I think it would be nice to add to opensees in the near future

allano89
Posts: 70
Joined: Fri Mar 05, 2021 4:26 am

Re: MOMENTS AND SHEARS IN SHEAR WALL

Post by allano89 » Tue Dec 06, 2022 3:17 am

STKO Team wrote:
Thu Nov 17, 2022 10:53 am
The moment is different because, I think, you computed just by summing the Moment Reaction at each node, isn't it?
This is not enough. The total moment with respect to the center of the wall is:
SUM(MYi) + SUM(FZi * Di) (for each node "i").
I.e., you have to sum the moments and the couple given by the forces times the distance from the center of the wall.

This is not easy to do manually.
In the next STKO version (3.2.0) there will be a dedicated tool in the post-processor.

In the meantime, I prepared a "relatively" simple TCL script that allows you to do the "Section Cut" for integrating nodal forces and moments along a Linear Cut.
Note: For simplicity, it will work only in 3D models, only for 2-node beams and 4-node shells (like in your file).
Note: It works only if you use 1 partition (instead the integrated tool in version 3.2.0 will work for every element, and for any number of partitions)


Here's your modified file:
08-MODELO EMPOTRADO 2 PISOS.zip


You can create selections sets for all the Edges where you want to compute Section Cuts:
Sets.png


For each selection set, you can create "Regions", in order to have a TCL list of nodes for each Section Cut.
After all regions, there is a script for the Section Cuts.
In the first lines, you have the User-Parameters (i.e. settings that you can change). Have a look at the descriptions, but it should be pretty easy to understand.

SectionCutScript.png



Pay attention to the "cut_sides". it should be +1 if the elements are on the +X direction of the cut, or -1 otherwise:
Signs and elements.png



This script will generate 6 files (for the 6 components N, Vy, Vz, My, Mz, T) for each section cut in a folder called "CutFiles".
These files have the same format of the Monitor Plots, so that if you have a monitor, you will be able to see them in real-time:

IntegratedResults.png
Dear Stko team
Please how the script works? I should consider the face local axes or the edge local axes, because in the Y direction I get moments higuer than ETABS?

STKO Team
Posts: 2068
Joined: Tue Oct 29, 2019 8:45 am

Re: MOMENTS AND SHEARS IN SHEAR WALL

Post by STKO Team » Wed Dec 07, 2022 10:53 am

In the TCL script you have a list called "all_cut_directions"
Those local axes should match the ETABS ones... otherwise you will see results in another reference system

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