Verification of modal analysis Results

[mecheil2000]

Why If I solve one small model (concrete building 10 floors) by using Etabs and the same building By Using robot I see the different results for modal analysis from each program
If the basics and concepts are the same in each one of them then why we get different results.

I hope any one can answer my question

[medo]

Please post more details about structure model and some details about the input and output from modal analysis.

[mecheil2000]

Please post more details about structure model and some details about the input and output from modal analysis.

thanks for your helping
But did you model any building by robot and Etabs and compare dynamic analysis result?
I will try to post the model

once again I have to thank you for your post and assistance

[troy_the.best]

My model etabs v9.7.1 and RSA2011 sp2
results are same. ıts perfect run.
no problem modal analysis. bye

falconado

[mecheil2000]

My model etabs v9.7.1 and RSA2011 sp2
results are same. ıts perfect run.
no problem modal analysis. bye

falconado

I found one thing
Sometimes when I use Riigid diaphragm With Salb (Flexible Rigid Diaphragm XY) I got this problem , I do not know why
I think rigid diaphragm some times creats a problem with dynamic analysis

[troy_the.best]

Yes you are right. when use rigid diaphram or semi rigid diaph. its given wrong results. İ hope from autodesk this bugs is fix on next Sp3 patch. Good works.

[quangntn1992743652]

I have trouble Robot and Etabs! You can help me? I have results period so different! Can you email your model Robot and Etabs in picture to me. My email :quangntn1992@gmail.com. Thanks you

- - - Updated - - -

My model etabs v9.7.1 and RSA2011 sp2
results are same. ıts perfect run.
no problem modal analysis. bye

falconado

[Ed Jobe]

I have trouble Robot and Etabs! You can help me? I have results period so different! Can you email your model Robot and Etabs in picture to me. My email :quangntn1992@gmail.com. Thanks you

- - - Updated - - -

If you want help, tell what your problem is.