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Connecting Wooden Rafters to Steel Tube Ridge Beam

Connecting Wooden Rafters to Steel Tube Ridge Beam

(OP)
I'm designing a portico - see attachment - the roof framing will be timber. However, the ridge beam will be a steel HSS 10 x 4 x 5/16; spanning about 28 feet. The architect doesn't want any interior posts supporting it.

To connect the rafters to the ridge beam can I use a timber rafter hanger, such as a Simpson LRU, and design screws to attach it? Or is there some other product available for this application. Google isn't much help today.

Thanks

RE: Connecting Wooden Rafters to Steel Tube Ridge Beam

Simpson used to have weldable hangers, but you ciuld also use a top plate of wood or side hung wood plates using Nelson sill plate anchors.

Mike McCann, PE, SE (WA)


RE: Connecting Wooden Rafters to Steel Tube Ridge Beam

(OP)
Thanks Mike; I knew I could rely on you! I was also thinking welding a pair of plates and thru-bolting the rafters.

RE: Connecting Wooden Rafters to Steel Tube Ridge Beam

Shoot standard Simpson rafter hangers into the side of the HSS using PAF's.

RE: Connecting Wooden Rafters to Steel Tube Ridge Beam

(OP)
Thanks Ron; another guy who can always be counted on.

RE: Connecting Wooden Rafters to Steel Tube Ridge Beam

There's also the hollo-bolt style anchors for fastening stuff to steel. Specifically HSS. Search for lindapter. I would use them or something equivalent to that to fasten a wood nailer/ledger and then use standard wood hangers.

RE: Connecting Wooden Rafters to Steel Tube Ridge Beam

(OP)
Good idea, I didn't think about blind bolts.

RE: Connecting Wooden Rafters to Steel Tube Ridge Beam

But if you are going to bolt on a ledger, why not just use through bolts?

RE: Connecting Wooden Rafters to Steel Tube Ridge Beam

(OP)
Actually, it's a moot point now. At the last minute the powers that be decided the rafters would look nicer sitting on the top of the ridge beam.

RE: Connecting Wooden Rafters to Steel Tube Ridge Beam

Still will need a wood nailer on top.

Mike McCann, PE, SE (WA)


RE: Connecting Wooden Rafters to Steel Tube Ridge Beam

Do others use through bolts on HSS? I was under the impression you would need to provide a nut/washer inside the tube. We typically use threaded welded studs in these situations.

RE: Connecting Wooden Rafters to Steel Tube Ridge Beam

(OP)
Mike - the powers that be want a pair of keeper angles screwed to the tube and thru-bolts to hold the rafters.

RE: Connecting Wooden Rafters to Steel Tube Ridge Beam

More complicated, but that will work too.

Mike McCann, PE, SE (WA)


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