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Best Practice for trimming concrete beam ends?

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    Best Practice for trimming concrete beam ends?

    I am working on a very complex building where there are no 90 degree angles. Radius slab edges and all kinds of kinked beams. What is the best practice for trimming the ends of the beam or at beam intersections? My coworker has been using the join/switch join order command. A lot of times we need to create an extrusion for the item that we want to "trim" and she is joining it to that extrusion. The extrusion workset is one that we do not publish. What is the difference between cutting the beam or joining the beam (with the extrusion). I cannot find any differences. Beam length and volume remain the same. I am not interested in any "analytical data". So with that said, what would be the best recommended practice? Cut or Join, or does it not matter? I have attached a PDF for an example. Thanks in advance for your help.
    Attached Files

    #2
    opening by face is probably your best bet, and this will let you trace your form as you go.

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      #3
      Concrete beams should cleanly join together regardless of the angle (see attached). Are the beams you're using custom families? Do both of them have the same associated work plane? Are they the same materials?

      Attached Files
      Tony Perez @Twitter
      Senior Structural Designer
      Tesla Gigafactory - Austin

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        #4
        Hi Tony! Thanks for the feedback. Yes I agree they do automatically join, except that the beams that I show in my example are two different depths, thus you get that corner that needs to be trimmed. I have some other examples of where the beams need to be trimmed as well. Please see attached. These are along the perimeter of a radius slab edge.
        Attached Files

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          #5
          Thank you Karalon10. I'll give that suggestion a try.

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            #6
            Best practice would be to join however if the beams have a definite break that you want people to see (due to different depths or widths) the cut will leave a line on your plan view. Obviously if the beams are the same depth (and width [for the elevation view]) you would prefer not to have the cut line thus using the join function

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              #7
              There is the cut profile command in Revit which should get you what you want. It should be essentially what you are doing, a void extrusion without the steps of creating a whole new element, then trimming it and making sure the extrusions are on the correct workset.
              Last edited by hjnb90; September 13, 2017, 04:31 PM.

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                #8
                Originally posted by NathanMorgan View Post
                Obviously if the beams are the same depth (and width [for the elevation view]) you would prefer not to have the cut line thus using the join function
                Presuming it's an in-situ-poured beam (you'd not want to see the "line") - but what if they were precast? Or not site-cut metal members? (one imagines/hopes you would want to see the "line").

                I'd personally work up the .rfa content to include cutting voids (to be electively assigned on an instance-by-instance basis) over relying on Revit's cutting/joining/merging tools*




                *that might get drawings done, but really don't offer much downstream.
                Last edited by snowyweston; September 13, 2017, 05:46 PM.

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                  #9
                  Understandably each site has a different situation. In South Africa, most of our stuff is in-situ. If you have precast items then I would suggest maybe creating a family for that pre-cast item as it wouldn't make sense to design a mould for the precast item and only use it once. So presuming the engineer thought it through you'd have a few of the same beams if they were pre-cast.

                  Would creating hundreds of different families for beams not also cause an issue?
                  snowyweston
                  maybe you'd be able to help with this?

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