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Slab edge....can somebody help a brother out?

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    Slab edge....can somebody help a brother out?

    Two questions really........

    1)
    I've read a few threads on slab edges, but can't figure out how to make a custom one.
    I have a composite slab, 3" concrete on 2" metal deck - 5" total thickness.

    At the edge of slab, the metal deck should stop - let's say....8" from the edge. That final 8" is poured solid with an additional 4" below (9" total thickness)
    How do I create a slab edge sweep to accomodate this?
    So - when I cut a section, I'll see the deck stopping and the solid "zone" out to the slab edge?

    2)
    A metal roof deck - no concrete above.
    The edge of deck has an edge angle all around the perimeter.
    How do I add the edge angle such that it's hosted by the deck so if the edge of deck changes, the angle moves with it?
    Is there a way to do this by just selecting the edge of the roof deck?

    Step by step instructions for either (or preferably both) questions would be greatly appreciated.

    --------------------------------------------------------------------------------------------------------------------
    I'm a bit amazed - I asked these same two questions during a BIM web meeting earlier today (about 15 Revit users involved)
    Total silence - no one could offer any guidance. The scenarios above must be something that's done all the time.
    Last edited by Defiant1; February 9, 2012, 09:58 PM.
    "Two possibilities exist. Either we are alone in the universe, or we are not.
    Both are equally terrifying."
    - Arthur C Clarke

    #2
    1. I would stop the sketch line for the slab 8" from the edge of the building. Then create a slab edge profile to take care of the other 8". The insertion point can be the top or bottom of the slab. I'd do it on the top, 8" wide, 9" down. Just a rectangle if I'm understanding your post correctly. Create a slab edge with that profile. Add it to the slab and you're done. You may have to join it afterwards.

    2. Fascia tool. Same principle as the slab edge, just create your profile. Be aware of the insertion point. Create a fascia with that profile. Pick the roof edge, done.

    Just saw the step by step request, which I didn't really do. If you need a better explanation, let me know. I'll walk ya through it.

    :banghead: Just realized this is the RST section. I do that a lot. I'm not sure if these tools even exist in RST. :laugh: I'm guessing the fascia tool doesn't.
    Last edited by dzatto; February 9, 2012, 10:00 PM.
    Dan

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      #3
      Fascia doesn't, but slab edge does. If you already have a profile, but when you go to make your slab edge in your project and it doesn't show up, it's because you forgot to change a setting. See attached.

      Click image for larger version

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      Adam Hutchinson
      Engineer in Training
      Integrus Architecture, P.S.

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        #4
        Yep, the damn Profile Usage setting. I always muff that one up. And, if you leave it as None ( I think it is), then the profile shows up for everything and your profile lists are huge!
        Dan

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          #5
          1.) does it ~need~ to be modeled? I think I'd handle a lot of this in detailing.
          if it needs to be modeled, I might try two slabs. One interior that's the 3" conc on 2" mtl deck. Then a perimeter, 9" thick slab. (Though I'm scratching my head on how this gets constructed. Where are the support(s) for the 9" thick slab? What supports the 2" mtl. deck?)

          2.) I created a rough family, complete with Bent Pl, studs and reinforcing, to handle a EOS for a supported slab; as it's just detail components inserted into an EOS profile, it didn't always mask my metal deck as I had hoped and it will not give correct quantities if you need QTO amounts. It might be able to be edited to attach to the edge of a metal deck. (see this post for my progress.)
          I started with the OOTB concrete (foundation) slab edge profile. This needs to be a closed sketch; draw the outline of the edge angle. Then insert an edge angle detail component into the profile. You might need to play with the reference planes for insertion. You'll place in in plan just as you would the concrete (foundation) edge of slab, so it will flex (and break) when you adjust the sketch of your metal deck.
          Last edited by LeanneZ; February 10, 2012, 01:42 PM.
          Leanne Zaras, CDT, LEED AP
          AutoCAD 2010 Certified Professional / Revit Architecture 2012 Certified Professional / Revit Structure 2015 Certified Professional
          ACAD2021, RST2014-2021 / Windows 10, 64-bit

          Comment


            #6
            Originally posted by Defiant1 View Post
            Two questions really........

            1)
            I've read a few threads on slab edges, but can't figure out how to make a custom one.
            I have a composite slab, 3" concrete on 2" metal deck - 5" total thickness.

            At the edge of slab, the metal deck should stop - let's say....8" from the edge. That final 8" is poured solid with an additional 4" below (9" total thickness)
            How do I create a slab edge sweep to accomodate this?
            So - when I cut a section, I'll see the deck stopping and the solid "zone" out to the slab edge?
            I would add the slab edge as others have explained. The slab edge profile should be for the total thickness of the slab with the downturn, and applied to the top edge of the slab (the default in plan view)
            However, the Slab (including the metal deck) will cut the slab edge. So it will look like the deck is cutting right through. You can get around this by using the "Concrete Cantilever" and "Steel Cantilever" properties of the slab sketch. "Concrete Cantilever" will add additional width to the slab without the deck profile being expanded. The "Steel Cantilever", to be visible, has to be less than or equal to the Concrete Cantilever. However, you can set the Steel Cantilever to be negative- that is, "inboard" of the slab sketch line, and in sections the concrete will display as full depth for that distance.

            Remember, the positive/negative convention is in relation to the sketch line direction- so for slabs drawn with the rectangle tool, the opposite sides of the rectangle will need opposite signs- might take some trial and error.

            Joe

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