Wood Truss Gable End Bracing (piggy back condition)
Wood Truss Gable End Bracing (piggy back condition)
(OP)
I have a project where the roof trusses need to be constructed with piggy backs due to their height. The roof is also configured so that this piggy back condition occurs at the gable end of the building. Typically, I show the standard MiTek gable end bracing details. However, because the overall height of the truss (17' from bearing to peak) and that truss is in two pieces, I'm unsure as to how to brace the gable end. If I use the standard bracing detail, the diagonal brace could be up to 22' long.
Any assistance or input would be greatly appreciated. Oh, the project is located in central Florida.
Thank you!
Any assistance or input would be greatly appreciated. Oh, the project is located in central Florida.
Thank you!





RE: Wood Truss Gable End Bracing (piggy back condition)
Garth Dreger PE
AZ Phoenix area
RE: Wood Truss Gable End Bracing (piggy back condition)
Thank you. I think that I'll lean towards that way. I may actually detail an "I-brace" detail rather than just a T or L-brace.
Thanks,
RE: Wood Truss Gable End Bracing (piggy back condition)
RE: Wood Truss Gable End Bracing (piggy back condition)
RE: Wood Truss Gable End Bracing (piggy back condition)
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Wood Truss Gable End Bracing (piggy back condition)
The problem with simply running kickers up to the roof is that it has a vertical component also. Thus the trusses need to be designed for an extra gravity and uplift wind loads. Good luck getting the trusses designed for that as most manufacturers rubber stamp everything. Plus you'll have to connect the trusses for the greater uplift load as well.
If you use X bracing then the trusses become chords for a cantelever beam that spans from the diaphragm downward. The bracing acts as the web members.
John Southard, M.S., P.E.
http://www.pdhlibrary.com