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How do Revit trusses really work?

18 ANTWORTEN 18
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Nachricht 1 von 19
Base12
1464 Aufrufe, 18 Antworten

How do Revit trusses really work?

I'm trying to make simplest truss you can imagine and it's giving me nothing but problems.  A: Is there a way to just designate a slope (pitch) to the trusses instead of a height?  That would solve my problem.  B: For reasons that I don't understand the truss won't (errors) attach to the underside of the simple roof I've created.  C: When I enter the height of the truss, which is the bearing plate to the underside of the roof deck... the top of the truss is correct, but the top chord comes just slightly up through the roof deck at the base (see attached image and properties).  If I raise the roof deck, then I have to raise the truss height value and the problem perpetuates.  The only way I could get it to work was by dragging with width of the truss to the inside of the walls, which obviously isn't correct.  How the heck do you work this thing?2023-12-15 14_08_49-Autodesk Revit 2023.1 - [78.1653 ARCH - TR GOLF PUMP HOUSE.rvt - Sheet_ A220 - B.jpg2023-12-15 14_14_47-New Message - Autodesk Community — Mozilla Firefox.jpg

18 ANTWORTEN 18
Nachricht 2 von 19
barthbradley
als Antwort auf: Base12

Understand Screenshot? 

 

slope truss.png

Nachricht 3 von 19
Base12
als Antwort auf: Base12

If I understand, to set the slope by pitch/angle then you have to do it in the family, not the project file, yes?

Nachricht 4 von 19
ToanDN
als Antwort auf: Base12

You might not need to concern about the pitch of the height at all if you attach the truss to a roof.

 

ToanDN_1-1702685099340.png

 

 

 

ToanDN_0-1702685059860.png

 

Nachricht 5 von 19
Base12
als Antwort auf: Base12

I tried this, a lot and it would never work for me.  It kept returning an error that said something like "creates an invalid profile" or something.  Item B in the OP

Nachricht 6 von 19
ToanDN
als Antwort auf: Base12


@Base12 wrote:

I tried this, a lot and it would never work for me.  It kept returning an error that said something like "creates an invalid profile" or something.  Item B in the OP


Share your file here if you want to know why it doesn't attach.  With that said, you can change the pitch in the project if it is an instance parameter, not just an angular dimension in the family.

Nachricht 7 von 19
barthbradley
als Antwort auf: Base12


@Base12 wrote:

If I understand, to set the slope by pitch/angle then you have to do it in the family, not the project file, yes?


 

No, you add those instance parameters/formulas I showed, and then you can set the Truss Instances "Slope" Parameter it in the Project to whatever suits your fancy. Basically, no different than setting the "Truss Height".  

 

Still, I agree with @ToanDN on this one.  By the time you get to Trusses, you will have your roof already. Just place a single Truss, Attach it to the Roof and then array the Truss. 

 

 

Nachricht 8 von 19
barthbradley
als Antwort auf: Base12

Try attaching a Flat Truss to your Sloped Roof.  Does it still not work? 

Nachricht 9 von 19
Base12
als Antwort auf: Base12

I did try a flat truss, and it didn't work either.  Here's the file.  To note, this not how I would typically model this building, but the client wanted to see all the members of the built-up roof modeled with the outriggers and various overhang layers, etc.  The trusses here are "eyeballed" so while they look good, they aren't actually attached or tied to anything.  Directly above the trusses is the "3/4" PLY ONLY" roof element that I'm trying to attach the truss to.  All of the other roof stuff above that element are irrelevant to this task. 

Nachricht 10 von 19
barthbradley
als Antwort auf: Base12

It's not you, it's the Truss.  Try another.  Try Fink.   

 

Truss Error.png

 

"...Not all truss families properly attach to a roof..." 

 

https://help.autodesk.com/view/RVT/2023/ENU/?guid=GUID-A77B218C-3EC7-4D60-AA69-B23CA115F5C4

 

Help | Edit a Truss Profile | Autodesk

 

BTW, Flat attaches fine in your Project in my testing.   

 

Truss Error2.png

Nachricht 11 von 19
Base12
als Antwort auf: Base12

I'll give it a shot.  Thanks for taking the time to look into it for me!

Nachricht 12 von 19
jay_colcombe
als Antwort auf: Base12

There is a Structural Framing > Truss Member which is a very simple Truss Family which i have seen used more in Architectural applications rather than Structural.  It is more driven from the Properties Palette than the Structural Truss Families - it may be a simpler solution? 

 

jay_colcombe_0-1702893400895.png

 

Jay Colcombe

Autodesk Certified Instructor
Revit Architecture & Structure Certified Professional
AutoCAD Certified Professional
B.Sc. Hons Civil & Structural Engineering

If you find my post interesting, feel free to give a Kudo.
If it solves your problem, please click Accept to enhance the Forum.
Nachricht 13 von 19
Base12
als Antwort auf: jay_colcombe

@jay_colcombewhere did you find that family?  I don't have a "Truss Members" category by default, only "Structural Trusses" and there's not a generic one in there by that name?  Is it maybe from a version of Revit that is not 2023?

Nachricht 14 von 19
jay_colcombe
als Antwort auf: Base12

Structure Tab > Beam > Insert Family > Structure Framing > Truss

 

You can also use the Insert Family from library option on the Insert Tab and search for Truss

Jay Colcombe

Autodesk Certified Instructor
Revit Architecture & Structure Certified Professional
AutoCAD Certified Professional
B.Sc. Hons Civil & Structural Engineering

If you find my post interesting, feel free to give a Kudo.
If it solves your problem, please click Accept to enhance the Forum.
Nachricht 15 von 19
Base12
als Antwort auf: jay_colcombe

I know how to load families, I'm saying that family doesn't exist in my installation.  Not even the folder.  Would you mind just sharing the family here?

Nachricht 16 von 19
jay_colcombe
als Antwort auf: Base12

Sorry I’m not at me laptop but will try and get this over to you!

Can you use the other Method as this is all the regions Revit Content online

Jay Colcombe

Autodesk Certified Instructor
Revit Architecture & Structure Certified Professional
AutoCAD Certified Professional
B.Sc. Hons Civil & Structural Engineering

If you find my post interesting, feel free to give a Kudo.
If it solves your problem, please click Accept to enhance the Forum.
Nachricht 17 von 19
jay_colcombe
als Antwort auf: Base12

Here it is not sure why you cannot find it?

 

jay_colcombe_1-1703016825364.png

 

 

 

Jay Colcombe

Autodesk Certified Instructor
Revit Architecture & Structure Certified Professional
AutoCAD Certified Professional
B.Sc. Hons Civil & Structural Engineering

If you find my post interesting, feel free to give a Kudo.
If it solves your problem, please click Accept to enhance the Forum.
Nachricht 18 von 19
Base12
als Antwort auf: Base12

I have plenty of other structural trusses - but not that one, and as I mentioned that folder does not exist for me.  Thanks for uploading the file however!2023-12-19 14_34_41-Load Autodesk Family.jpg

Nachricht 19 von 19
Base12
als Antwort auf: Base12

While some of the other options in this thread 'may' have worked, the family uploaded by @jay_colcombe was the best solution for me as that family had the parameters already in it that I would have had to create otherwise.  Thank again Jay!

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