Anchoring Wood Rafters to a Steel Beam (Uplift)
Anchoring Wood Rafters to a Steel Beam (Uplift)
(OP)
So instead of a solid sawn or glulam beam a client wants to use a steel beam and complicate matters. I have 4x10 rafters on 48" centers resting on this beam, the roof has a 2/12 pitch with a slight birdsmouth cut. Normally I would use a couple of Simpson H2.5 hurricane ties for uplift of the rafters however the steel beam potentially changes that. Are there any off the shelf products for joist-to-steel beam or rafter-to-steel beam ties for uplift in such a situation.
Another option I was considering was bolting a "sill plate" on top of the steel beam and then rest the rafters on top of this plate and attach the ties to this.
I rarely deal with steel in most of my residential designs (the factor being the cost) so wood/steel interfaces always seem to be my achilles heel. On that note does anyone have any suggestions or resources for standard steel-to-wood connections for residential and light commercial work?
Another option I was considering was bolting a "sill plate" on top of the steel beam and then rest the rafters on top of this plate and attach the ties to this.
I rarely deal with steel in most of my residential designs (the factor being the cost) so wood/steel interfaces always seem to be my achilles heel. On that note does anyone have any suggestions or resources for standard steel-to-wood connections for residential and light commercial work?
A confused student is a good student.
Nathaniel P. Wilkerson, PE
www.medeek.com






RE: Anchoring Wood Rafters to a Steel Beam (Uplift)
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Anchoring Wood Rafters to a Steel Beam (Uplift)
RE: Anchoring Wood Rafters to a Steel Beam (Uplift)
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Anchoring Wood Rafters to a Steel Beam (Uplift)
I'm currently using a weld option for top flange hangers to hang some LVL's to existing Steel wide flange shapes to hold new Rooftop units. I put on the drawings to have a CWI inspect the welds, might be overkill, but I don't want to expect the contractor to get it right the first try since it's likely something they haven't done before (not even being cynical about the contractor, just not something they likely do all the time). If you go with the welds, since it's residential, you might just want to say that you want to see the welds yourself before they cover them up if you choose that option. Or at least get them to do a mockup so you can see if it looks OK to you.
RE: Anchoring Wood Rafters to a Steel Beam (Uplift)
RE: Anchoring Wood Rafters to a Steel Beam (Uplift)
RE: Anchoring Wood Rafters to a Steel Beam (Uplift)
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Anchoring Wood Rafters to a Steel Beam (Uplift)
somewhat related article:
Link
RE: Anchoring Wood Rafters to a Steel Beam (Uplift)
What is the PAF acronym? With the rafters at 48" on center I should be able to arrange the bolts to miss the rafters but I can almost count on the contractor to screw this up.
A confused student is a good student.
Nathaniel P. Wilkerson, PE
www.medeek.com
RE: Anchoring Wood Rafters to a Steel Beam (Uplift)
RE: Anchoring Wood Rafters to a Steel Beam (Uplift)