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Forums >> Revit Structure >> Technical Support >> JOIST GIRDER INQUIRY!

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Tue, Oct 2, 2007 at 3:07:54 PM | JOIST GIRDER INQUIRY!

#1

DANDI


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Joined: Thu, Sep 6, 2007
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Hi All,I have been working in a Revit Structure Model where I suppose to replace a 28LH girder with a 36G4N joist girder on a 48'-9" span. Apparenty, it cannot be done because I get an error message that says it cannot create this type of girder. I want to mention that 36G4N8K type does not exist in the library. After few attempts to create one we failed. OK, I have tried to trick the model and to use a 36LH size but I get the same error,  probably because the depth is to high for this span. My engineers told me that a 36LH cannot span on a 48'-9" but a 36G4N8K should work just fine. So, I reached a stopping point and I desperately need help. Any suggestions would be greatly appreciated.Thanks a lot.Sincerely,Dan Ungureanu

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Tue, Oct 2, 2007 at 5:43:29 PM | JOIST GIRDER INQUIRY!

#2

justinblack


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Joined: Fri, Jun 22, 2007
62 Posts
5 Stars: 1 Votes


I've run into this issue before as well.  It seems like revit restricts the depth of a joist relative to the span length. 

Knowing this led me to investigate deeper into a formula with in the family. 

What I found that made the difference was the formula for "End Panel".  If you look into it, yours probably says 2.0*Length.  If you change this to be 1.5*Length it should give you the chance to make deeper joists for shorter spans. 

NOTE: This does change spacing of the end panels.  Not that anyone would ever notice it.

HTH

JB


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Mon, Jan 28, 2008 at 11:23:13 AM | JOIST GIRDER INQUIRY!

#3

kmh116loop


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Joined: Thu, Dec 6, 2007
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Please help! I also have girder problems only i need to make a lattice girder that can change its height and length without changing the unit angles in between. So if I want it to go longer it should have more units in and thay should grow proportionately bigger as the height increases. Is it possible to do this?

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