Clipped hip dormer roof 1

[COEngineeer]

So I have this project with a lot of dormers. The dormers ridge beams are clipped at the front so I must use bent ridge steel beam. Do I have any other option? Do you think I can do wood moment connection? What shall I use? Let me try to draw it with the keyboad of the section of the roof.


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[structuralaggie]

The collar tie would require you to have some portion of a flat ceiling - if this is the case, in place of the bent steel beam put a site built wood truss, bolt and/or nailed together. If the dormer is small enough (it looks like it is in the picture), a double rafter and collar tie will do it. It will be tail bearing, so bending in the top chord and horizontal deflection will control the design.

NKT - I know it will work that way if constructed correctly, I just haven't had much luck getting contactors to do things they are not use to. The steel is easy to inspect. It is either there or its not. Maybe I am just set in my ways.

 

[COEngineeer]

How about somthing like this?

 

[structuralaggie]

I am not sure what that is. How are you posting the picture?

 

[COEngineeer]

thats the top view. Just go to

http://www.photobucket.com

then click on process TGML in this posting window to learn how to link a picture.

 

[structuralaggie]

oh, plan view, got it now. How big is this thing? It doesn't look like it is too much to get excited about. With diaphram and tension in the top plates, it will probably work without doing anything.

If they get big, there is no ceiling, and your nervous, I say use steel like I suggested earlier.

 

[COEngineeer]

Well.. the snow load is 60 psf so.... Maybe I should try analyzing it like a diaphragm for the small rafters then.

 

[structuralaggie]

You're the engineer. I would really be careful about counting on the diaphram when loads are significant. It will look fine for a while, then in a year or so cracks will appear in the sheetrock.