Pushover analysis error

[felicegiordano95]

Hello,
I wanted to ask how I can insert the steel into the T and L sections as illustrated in the attached files.
Furthermore, there is a convergence problem regarding the final parts of the analysis.
I also wanted to ask you if the load distribution in the plates was consistent with what is expressed by the PDF files.
You can also check if there are other errors inside the file, and eventually fix them by sending me the correct file, thank you very much.

[felicegiordano95]

The right file is the following, not the one above. I'm sorry.

[marafini.f]

Dear Felice Giordano,

the load distribution is correct, you successfully oriented the loads in the direction indicated in your plans.
As for how to insert reinforcements in the T and L sections the procedure is the following:

You draw your section geometry in the render view.

1.png (102.9 KiB) Viewed 4286 times

You create a Fiber physical property choosing it among section and import the geometry you just created

2.png (58.86 KiB) Viewed 4286 times

3.png (50.8 KiB) Viewed 4286 times

Then you create a surface and following a surface fiber.

5.png (57.32 KiB) Viewed 4286 times

6.png (22.96 KiB) Viewed 4286 times

After you created your section like this you can draw the section of each reinforcement you want to add and import it also in the fiber section (remember to create holes in your original face, just follow the terminal instructions in the fiber editor). Also for the longitudinal reinforcement you can create surface fibers and assign the relevant material.

The entire process is explained at par 2.4.2.2 in our manual, you find it at this link.
http://www.asdeasoft.net/pdf/manual_STKO_may_2021.pdf

Complete the model and let us know if you still encounter problem, You need to complete the sections before you analyse any results or convergence errors.

Enjoy your modelling

[felicegiordano95]

Thanks to you I was able to model the whole structure, but when I start the analysis it still gives me some problems.
Could you solve them and check them out?
I thank you in advance

[marafini.f]

Caro Felice,
here is your model.
Now it runs.
I made a lot of stuff, your geometry was a mess. A lot of overlapping edges.
There was no node in the displacement control selection set.
I am not sure what you want to achieve in terms of results.

Esempio 2.4.scd.zip

(221.03 KiB) Downloaded 214 times

I am doing a class on the basics of OpenSees and STKO, you can find it at this link.

https://www.youtube.com/watch?v=4WvKXWV ... OIDBr0DauU

When you post a question please do specify what the problem is and what you have tried already to solve it.

Enjoy your modelling
Francesca

[felicegiordano95]

I apologize, but I still get the following error, after starting the analysis .. my goal is to build the pushover curve of this building.

[Horace Horsecollar]

We run your analysis. The load-displacement curve in figure 35 is yours:
[/attachment]

image (35).png The load-displacement curve in figure 36 is obtained reducing the target displacement which was too large: [attachment=0]image (36).png

Nonlinear analysis is a complicated task. We strongly suggest you to l study the problem of nonlinear convergence and solution algorithms. We gave a lot of webinars and courses on this topic. You can find them on our website.

Regards

[felicegiordano95]

Hello,
I wanted to ask you how I could model the diaphragm.
Since my goal is to analyze the differences between a model in which the diaphragm is infinitely rigid and the other in which its deformability is evaluated.
I have tried to make the following models, but I don't think they are very good.
I ask you as usual if you can fix them.
Thank you.

[marafini.f]

Dear Giordano,

I did not run your models but I strongly suggest you to watch these webinars
https://asdeasoft.net/?get-started-webinars
Get Started in Opensees with STKO

I am really sorry, I am not able to fix your model and send them back to you, I do not have the time for it. There are a lot of things wrong with them. The geometry is separated (compounds do not merge your geometry, they just group them in the work tree), you assigned fiber sections directly to the beam elements of your travetti without beamsectionproperties. You created faces without creating a finite element for the face. The surfaceLoad is used when you do not want to model a shell element, when you have one a faceLoad is enough.

You still call elements to which you assigned fiber section and a lobatto scheme "plasticità concentrata", and that tells me you are still very confused on the topic.

OpenSees is not easy to get your head around, nor is finite element modeling, but I am sure you can make some progress. We have a lot, really a lot of free resources on our website, not just the webinars I am doing, but previous ones from Dr. Petracca.

I ask you if you please take some time to study these resources and make an attempt yourself to work on your model. There are also a lot of blog posts you can browse here.
We can answer even 10 questions a day from you, just try to specify what you are asking and break down your task in smaller steps, instead of just sending the model and ask if we can fix it.
Come next week at GetStarted with OpenSees with STKO, we have a free space for live questions at the end.

I mean well so please do not take it personally.

Let us know how your progress go.
Francesca

[felicegiordano95]

I tried to "merge" the elements but it breaks the internal and external beams, could this be a problem?
As for the "travetti", I apologize but I can't understand the mistake ..
For the plate, I read in the manual that this could be a solution, I should just use a "ForceFromReaction" as the load, but by doing so I would not be able to impose the direction of the load, right?
Thank you, always for your availability.

In addition, the following errors persist..