MOMENTS AND SHEARS IN SHEAR WALL
Re: MOMENTS AND SHEARS IN SHEAR WALL
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.
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 (52.59 KiB) Viewed 4153 times

 model complete.png (163.38 KiB) Viewed 4153 times
Re: MOMENTS AND SHEARS IN SHEAR WALL
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?
But without the SCD model, I cannot tell you the reason for it. Can you share it?
Re: MOMENTS AND SHEARS IN SHEAR WALL
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 momentcurvature 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?)
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 momentcurvature 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 (63.61 KiB) Viewed 4137 times
Last edited by allano89 on Tue Nov 29, 2022 2:04 am, edited 1 time in total.
Re: MOMENTS AND SHEARS IN SHEAR WALL
You're welcome!
You can remove the attachment from your post
It's not a problem. It says that OpenSees had a convergence issue. Then the analysis loop written by STKO tries to reduce the timestep to allow convergence (it's because you chose Adaptive Time Step).But I had another problem Please whats the meaning about this mistake? Because the model continued running.
You can remove the attachment from your post
Re: MOMENTS AND SHEARS IN SHEAR WALL
Thanks for your answer
I have the last quesion please. how to get the momentcurvature of the shear walls?
Best regards
I have the last quesion please. how to get the momentcurvature of the shear walls?
Best regards
Re: MOMENTS AND SHEARS IN SHEAR WALL
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
But I think it would be nice to add to opensees in the near future
Re: MOMENTS AND SHEARS IN SHEAR WALL
Dear Stko teamSTKO Team wrote: ↑Thu Nov 17, 2022 10:53 amThe 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 postprocessor.
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 2node beams and 4node 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:
08MODELO 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 UserParameters (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 realtime:
IntegratedResults.png
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?
Re: MOMENTS AND SHEARS IN SHEAR WALL
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
Those local axes should match the ETABS ones... otherwise you will see results in another reference system