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Thread: Revit Analytical Model vs 3rd Party Software

  1. #1
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    Revit Analytical Model vs 3rd Party Software

    Hi.

    I'm hoping to get some feedback from engineers that use Revit and other software to design structures.

    If I look at a braced bay in a steel framed building:


    • the analytical line for a column is centered on column geometry
    • the analytical line for a vertical brace is centered on brace geometry
    • the analytical line for floor/roof framing is located at the top of the member.


    Does anyone know why this is and is there a way to change it to be centered on member geometry?

    I ask this is because engineers like when all the nodes connect to a common point as much as possible.

    My other question is, if you look at the image below, does it really make a substantial difference if the framing analytical lines are NOT at the center of the beam (if they are left at top of the beam and braces are left at the center)? As soon as I have two different beam depths along the same beam line the analytical lines will not be continuous if they are to be located at the center of the beam geometry so to me it makes sense that the analytical lines are located at the top of the beam.

    To me, it makes sense how Revit is locating the analytical nodes/lines but I want to understand from an engineer's perspective if having the brace nodes offset from framing nodes affects the design results considerably?


    Attached Thumbnails Attached Thumbnails Revit Analytical Model vs 3rd Party Software-capture.png  

  2. #2
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    1. When you create a beam, you can set its z/y Justification and z/y Offset Value. these parameters set the position of the beam geometry relative to the beam Location Line.
    By default, the Analytical Line (AL) coincides with the Location Line.

    2. You can override AL location later:
    Select desired AL;
    Go to Properties - Analytical Alignment group;

    Change Start /End Alignment Method to "Projection";
    Play with Start/End y/z Projection parameter values.

    You can also move AL ends manually via Analytical Adjust command.

    3. In general, it would be better to create something like an agreement on analytic modeling with your engineers, taking into account the analysis software used. At least some basic rules, for example: girders should have top z justifications; ends of analytical lines of the braces should be moved to the intersection of the girders, if the distance is less than 200mm. Some structural analysis programs can automatically adjust Revit AL during import, so the rules may vary.
    Attached Thumbnails Attached Thumbnails Revit Analytical Model vs 3rd Party Software-analytical-alignment-group.png  
    Last edited by Nurlan; March 1st, 2019 at 04:50 AM.

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