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Home / Questions /Q 965
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engr khalil dawar
engr khalil dawar

engr khalil dawar

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engr khalil dawarBeginer
Asked: August 6, 20202020-08-06T21:24:22+06:00 2020-08-06T21:24:22+06:00In: Engineering Software

Rebars detail of column in etabs after detailing

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AoA SIr.

sir in etabs we often face a problem that in column steel required in uper stories is more then than in lower stories,
but in common practice the load t=on the column of lower stories is more than the upper stories, so please guide me that why etabs gives us such result

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    1. admin

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      admin Intermediate
      2020-08-08T23:13:32+06:00Added an answer on August 8, 2020 at 11:13 pm

      First we need to know about Unbalanced Moment.

      Unbalanced Moment:Ā Gravity loads on columns consist of an axial load and moments about both axes where the column design moments are caused by unbalanced loading. Such moments are created when there is an imbalance in the loads on one side of the column versus the loads on the other side. Each beam induces a moment equal to the reaction times the connection eccentricity. The unbalanced moment is the difference in the reactions on opposite sides of the column multiplied by the eccentricity.

      If in upper story the unbalanced moment is higher than the lower story then rebar requirement will be higher accordingly.

      For example, imagine one case that the unbalanced moment is distributed among three members(2side beams+one bottom column) in top story. In lower stories, four members(2side beams+Upper Column+Lower Column) share the unbalanced moment at the beam-column joint. So in top story required rebar will be more than lower story.

      Difference in unbalance moment for different floors can be caused by upper-lower floor framing difference,loading difference etc.

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      • engr khalil dawar

        engr khalil dawar

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        engr khalil dawar Beginer
        2020-08-09T02:48:38+06:00Replied to answer on August 9, 2020 at 2:48 am

        Thank you Sir for your kind responce

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    2. admin

      admin

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      admin Intermediate
      2020-08-09T02:15:37+06:00Added an answer on August 9, 2020 at 2:15 am

      You can check the full blog writing- https://decode-bd.com/why-does-required-column-reinforcement-in-the-upper-story-appear-higher-than-the-lower-story-and-what-are-the-solutions/

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    3. Luckysingh

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      Luckysingh Beginer
      2020-08-08T02:28:40+06:00Added an answer on August 8, 2020 at 2:28 am

      i am also facing same problem bro

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