Wood Screened Porch - 3 Season Room Lateral System 1

[RFreund]

Do we have any good solutions for a screened porch or 3-season room lateral system? Either free standing or attached to a wall of a home (assuming the roof is no tied into the house roof, but rather frames into a gable end).
Possible Ideas:
[ol 1]
[li]Wood “moment frame” – notch and/or bolt the roof beams into the columns. We would need deeper roof beams.[/li]
[li]Gussets or kickers at post to beam connections.[/li]
[li]Embed the posts in the foundation so that they cantilever up to the roof[/li]
[li]Use a short wall at the corners[/li]
[li]Tie into the existing.[/li]
[/ol]

I'm get push back with all of these. Usually the floor of these is elevated (think walk-out basement) as well, so #3 really isn't an option.

EIT

http://www.HowToEngineer.com

 

[jayrod12]

With an elevated floor I've done a cantilever column idea just by extending the column past the floor plate a bit and then designed the connection at the base of the column and the floor plate for the lateral reactions.

 

[msquared48]

I use 2 to 3 foot high plywood shear walls between the wood columns to develop a moment connection for the columns. Rest above is screened.

Mike McCann, PE, SE (WA)

 

[JAE]

We've used a detail where we embed a large steel angle in a concrete pier or pedestal - fixed to the concrete with adequate headed studs and wrapped in a steel rebar cage.
The angle extends vertically out of the concrete for a distance (perhaps 3 ft) and is bolted to vertical wood columns. This forms a rigid base in which a cantilever column system can be developed.

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[RFreund]

Thanks guys. Those are all pretty good. Let's see how it goes...

EIT

http://www.HowToEngineer.com

 

[KootK]

Either free standing or attached to a wall of a home (assuming the roof is no tied into the house roof, but rather frames into a gable end)

Is your porch tied into a gable end of the main building? If so, that strikes me as the most logical load path.

While I don't think that you'll find the answer to your specific question there, this is a good and relevant discussion on one of XR250's threads: Link

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.