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Hi luckypants,

I'm glad to have been helpful. I meant exactly what you did.

Yes, the ElasticBeamColumns consider the torsion. You can also tell from the input parameters where both J and G appear.

If you make a short report of your experience you can send it to me in a private message! Thank you ...

Hi Zeeshanbhat,

The model is giving you problems because you didn't put any masses.


2021-02-25 15_30_58-STKO (Version 2.0.0) - PreProcessor [TRY NEW ONE_].png


If you put them the analysis will work fine.


2021-02-25 15_30_58-STKO (Version 2.0.0) - PreProcessor [TRY NEW ONE_]_2.png ...

Hi luckypants,

I remade the model without walls and membranes on sap2000 and found the same precise modal results as STKO.

SAP2000 Results :
Image 1.png
Image 1_bis.png

STKO Results:
Image 2.png

As I told you in a few posts ago, I set to 0 the multipliers of the shear areas of the sections ...

Hi Zeeshanbhat,

You did not assign the sections at 4 columns of the ground floor, also the master node constraint is missing in the constraint pattern.


Now it works.


Luca

Hi luckypants,

having removed the walls, the only thing that differentiates the 2 models now is the floor diaphragms, try removing the membranes as well in ETABS.

Can you send me the ETABS output of the time vs displacement? That way I can do some testing with STKO.

Regard

Hi luckypants,

I'm trying to compare your two models. I'll tell you a few observations that came to my mind:

- The two models have quite different fundamental periods. The masses are the same, so the problem should be on the stiffness side.

- I saw from the ETABS report that you assigned a ...

Thank you ! It Work very well !