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Elie Saadeh

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About Elie Saadeh

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    2nd Lieutenant
  1. ETABS modifiers issue

    Hi, i am a fifth year student working on my final project, it is a 59 floors + basements tower. I am having a weird problem; after applying the stiffness or property modifiers (0.35 for beams and walls, 0.7 for columns and 0.25 for slabs), i got an instability warning during analysis. After several trials i found out that the problem is from the modifiers of the slabs, the other elements don't give me any warnings. So i tried to change the value of the 0.25 modifier and increased it to 0.35 (or higher) and after that i didnt get any warning messages. Is it normal or logical to get an instability warning below a certain value for a property modifier? or there is another problem related to something else and appears when i do this adjustment ?? i still cant use the 0.25 modifier for the slabs (for m11 m22 and m12). Any help is appreciated a lot. Thanks.
  2. Hi, i am a fifth year student working on my final project, it is a 59 floors +  basements tower.

    I am having a weird problem; after applying the stiffness or property modifiers (0.35 for beams and walls, 0.7 for columns and 0.25 for slabs), i got an instability warning during analysis. After several trials i found out that the problem is from the modifiers of the slabs, the other elements don't give me any warnings.
    So i tried to change the value of the 0.25 modifier and increased it to 0.35 (or higher) and after that i didnt get any warning messages.

    Is it normal or logical to get an instability warning below a certain value for a property modifier? or there is another problem related to something else and appears when i do this adjustment ??

    i still cant use the 0.25 modifier for the slabs (for m11 m22 and m12).
    Any help is appreciated a lot. Thanks.

    1. Rana

      Rana

      Pls post inside the forum.

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