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  1. #1
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    Default Verification of modal analysis Results

    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

  2. #2
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    Default Re: Verification of modal analysis Results

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

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    Default Re: Verification of modal analysis Results

    Quote Originally Posted by medo View Post
    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

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    Default Re: Verification of modal analysis Results

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

    falconado
    Attached Images Attached Images

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    Default Re: Verification of modal analysis Results

    Quote Originally Posted by troy_the.best View Post
    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

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    Default Re: Verification of modal analysis Results

    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.

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    Default Re: Verification of modal analysis Results

    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 - - -

    Quote Originally Posted by troy_the.best View Post
    My model etabs v9.7.1 and RSA2011 sp2
    results are same. ıts perfect run.
    no problem modal analysis. bye

    falconado
    Last edited by Ed Jobe; 2017-02-15 at 03:08 PM.

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    Default Re: Verification of modal analysis Results

    Quote Originally Posted by quangntn1992743652 View Post
    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.
    C:> ED WORKING....

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