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Thread: Help w/ Structural Framing

  1. #1
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    Help w/ Structural Framing

    I brought in an OOTB piece of c-channel. The insertion point is such that when the c-channel is laying on-end, the top end of the c-channel is lined up to the bottom of the floor. I need just the opposite; the bottom end of the channel laying on top of the floor.

    I know very little about family modification so I would appreciate any advice on how to accomplish this. On opening the family there are several work planes associated to different things. Once I break the constraints and move the channel to the proper plane, I can't put humpty dumpty back together again.

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    Forum Addict elton williams's Avatar
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    Quote Originally Posted by mdomer View Post
    I brought in an OOTB piece of c-channel. The insertion point is such that when the c-channel is laying on-end, the top end of the c-channel is lined up to the bottom of the floor. I need just the opposite; the bottom end of the channel laying on top of the floor.

    I know very little about family modification so I would appreciate any advice on how to accomplish this. On opening the family there are several work planes associated to different things. Once I break the constraints and move the channel to the proper plane, I can't put humpty dumpty back together again.
    Structural families are a breed of their own and if you start shifting things around inside the family without knowing what you're doing things can get messy really quickly, as you have discovered.
    In the project, select the structural member and start to get familiar with the instance parameters. Here you will find rotation parameters and justification parameters.

  3. #3
    Member Darius's Avatar
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    in structural families there is a paramerter section called geometric position try adjusting those parameters to see if that helps before you modify the families.


    also the parameter called cross section rotation will spin the beam on its horizontal access
    Last edited by Darius; April 4th, 2016 at 07:25 PM.

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    Member byk3bep's Avatar
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    This is what you are after i guess

    Help w/ Structural Framing-ss1.jpg

  5. #5
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    Quote Originally Posted by byk3bep View Post
    This is what you are after i guess

    Click image for larger version. 

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    That's it!

    Thank you! So simple

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    with structural framing a few important things to help you out.
    In general when troubleshooting -
    Most problems (99.99% of them you can possibly encounter) with framing is going to be manageable in the element properties box.
    If it is not in the properties box, the final solution/problem will be in the family itself.

    You can place sloped reference planes to place things like rafters, and purlins easily.
    Simply name your reference plane (logically) for example "roof grid a to grid c" and then you can define this reference plane as a work plane before placing your framing. (don't forget to redefine it to a level once you are done placing on that slope)

    You have a few options in the properties box that are really useful
    X, Y and Z offsets.
    "Z Justification" (place on centreline, top of beam, or bottom of beam") This is the one you needed to adjust for your current problem - however you could have also managed this by altering your Z offset. I prefer to set the justification correctly as it is easier to manage, rather than a Z offset.
    Also for example with the "Z justification" I would set my rafter to place on that sloped reference plane at "top of beam" and my purlin I would place using the very same reference plane and set it to justify at the "bottom of beam" plus perhaps an offset of 10mm if I really want to model exactly with my purlin cleats etc included.

    Also there is a "rotation" option available

    Note that things such as rotation, and Z offset, will be affected directly by the justification.
    For example the pivot point for the rotation of an object, rotates around the Z justification as the centre-point of the rotation.
    Last edited by Karalon10; May 13th, 2016 at 12:13 PM.

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