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Forums >> Revit Structure >> Technical Support >> Pre-Engineered Metal Building
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Joined: Fri, Aug 20, 2010
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Hello! I am a current student that is new to Revit Structural and curious as to the best method to create a Pre-Engineered Metal Building. It has tapered columns and and tapered rafters that vary along 8 grid lines. I've attached an image of the basic outline of it to give you a better idea of what I am working with. The rafters are not tapered in this picture, but vary in the next few pages, along with the columns. I am curious to know if it would be easier to edit a family type of columns, then rafters and attach them on the floor plan? Or would it be simpler to create one large Pre-Engineered Metal Building unit for each grid line? Any help would be greatly appreciated, thanks!
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Joined: Tue, May 16, 2006
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You can do all of this in Revit - see attached. The frames I used here were adapted from the frame family that is in the download area. Please look there. There are several pre-engineered families there.
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I'm getting a decent start basing off some of the library edits, but for some reason it will not let me edit my members in elevation view. It is stating that it can only edit off something parallel to the member and refers me to the floor/ceiling plan. I've attached the file for reference
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It all depends on where / how the shap is created. Follow what Revit tells you and change views.
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Joined: Fri, Sep 22, 2006
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You can make this ridgid frame from an elevation view and make it exactly like the original and then copy it. I would use the model in place as you are not likely to be reusing this frame. Just create three or four extrusions and you will be done.
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Last problem I seem to be having is forming the tapered rafter. The rafter ends up tapered on other grid lines. I'm just curious as to the best method of shaping this; should I use a swept blend? Which view is easiest to shape it? I greatly appreciate all the help you guys are giving by the way. I'm slowly learning how this is all thrown together. Edited on: Thu, Aug 26, 2010 at 11:34:20 PM
Edited on: Thu, Aug 26, 2010 at 11:34:37 PM
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Swept blend would work but most of these are built up just like the actual frame. Flanges can be sweeps along a path and the web is an extrusion from the elevation view.
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Joined: Mon, Aug 10, 2009
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Does anyone know if there is a pre-fab steel building manufacturer that produces a curved roof? I'm looknig for a basic Butler building, but with a curved roof, not a low slope gable roof. Is there anyone that manufactures structures like these? In real life, not Revit, well okay, Revit too. Thanks in advance.
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I suggest you google this. There are quonset hut metal buildings that are full curved roof. Butler and other MBMFG's will also do arched roofs.
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The Pre Eng Model you create WWHub is really great. I am curious how you did that as I am having a hard enought ime jus tinstering girts. Does anyone know of some step by step directions on creating pre eng models?
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Joined: Mon, Feb 23, 2009
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I have a few families like this made already and so far they have been just been for shape and size representation of existing conditions. One of the things that the engineers would like to see is analytics for these families. I am curious if your frames are analytical. If so, was there a great deal of effort put into accurately depicting design criteria?
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My frames were NOT analytical and I don't see any reson for them to be. The pre-engineered manufacturer has specialty programs just not analyse these special shapes.
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In new construction yes I do not see a point but being able to reanalyze when working with existing buildings that use pre-engineered frames would be very nice. Especially when the the frame engineers are not involved with the rebuild and the client has a tendancy to use them to support additional loads (Which should not be done without reanalyzing since they are usually designed to the bare minimum).
Right now our engineers have to maually build each frame line by line for each frame in our analysis program on top of the designer time modeling the revit frames. I was just curious if there was some way that I could help improve the exports or cut down the time spent with existing frames in general
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Kelsey85: I have found that puting a referance plane at the top of steel (of your frame) for each direction of slope works great for adding purlins to your roof. If you give the Plane a name then you can switch over to your roof framing plan and set that as your active plane using the work plane toolbar on your home tab. Now simply pick which member you want to use for a purlin and model it in as you would any other beam. I like to cut a section and verify that beams are rotated properly and I will also use the section to check and adjust spacings. Girts are much simpler. Just place the first girt line in plan and copy them up as need
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Hi all, longtime autocad user but new to Revit and first time post. I am tasked with trying to bring our metal building company into a BIM / 3D modelling environment from what is a typical 2D Autocad drafting office. My main goal is to generate 3D drawings with the ability to generate roof details, plans, etc. and have Revit generate metal cladding panel takeoffs with lengths, insulation quantities, thermal clip quantities, fatener quantities, roof panel lengths, gutters, etc. Basically try to automate much of what is being done now so that it is less tedious and can automate the fabrication issue of the various materials. We tend to be a bit of a custom manufacturer with different wall & roof configurations from just metal cladding to standing seam roofs at various slopes. My question for the forum is have I bitten off more than I can chew in embarking on this? Is anyone currently doing what I am tasked with and have you had success? I fully expect challenges along the way, require patience and know it will be quite a learning curve but I am hoping to not involve countless hours if in anyones past experiences or efforts state that it is not possible. I have to believe it is given the complexity of many models that have been done. I should note that I do not need to detail the structural elements to issue to fabrication with Revit as that is done by a 3rd party outside our office. I thought I would start by generating common shapes / parts / components that we typically use into a revit format. Any advice, criticisms, cautions, etc. is greatly appreciated and thank you in advance for any responses. Cheers all.
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