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Hello i can't see the tensions in the plates.

Dear felice,
Sorry we didn't get back to you about the stress in the plates.
You should try and use the layeredShell instead of the PlateFiber. You should define the material and then a LayeredShell physical property with at least three layers with specific thicknesses referencing that same material. The sum of the thickness is the total thickness of your slab.
Try it out and let me know how it goes.
Francesca

I think I succeeded, in the attachment I insert the final file.

Dear felice,

I did not get what you want me to check.

I just ran the model and the period is very high, maybe you go the unit of the mass or the stiffness wrong?

Please analysis your results

Francesca

Hello I wanted to ask you if the STKO software automatically calculates the g1, that is the weight of the elements, or should I also add this in the vertical loads.
Then I would like to ask if to increase the stiffness of the deck I have to insert a rigid diaphragm as a kinematic constraint, and where I could see a video that explains me how to do it ..
Thanks for your help.
Felice Giordano

Dear Felice,

the software does not calculate self-weight by itself. You need to input it as a load.

As for rigidDiaphragms it is discussed in many videos, this for example.

https://www.youtube.com/watch?v=vPB9ZwTZbNw

Even the mass does not calculate itself? and if so where should I insert it?

No it does not calculate itself. In conditions, you can add mass in the same way you add loads, at the nodes on the edges or distributed on faces.
If you type the word "mass" in the search bar of the forum you will find many threads on this topic that could be of use.

I can't reduce the period of this structure which should be around 1 and instead I get 10.