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vertical log home shear design problem

thread488-260493

vertical log home shear design problem

vertical log home shear design problem

(OP)
I am looking for ideas on how to creat shear walls in a building built in 1950 out of eight inch logs oriented in a vertical fashion.  There are no interior walls to use.  The 8 foot walls sits on a concrete foundation and 2x8 sub floor with rim joists, the roof is a site built truss.  The fix has to remain "consistent with the historic" look of the structure, so no replacing sections with BWP's. I was considering creating a BWP out of the corner's with rod's or cables.  Any idea's on making that work?
 

RE: vertical log home shear design problem

Cables should work just fine.  With a turnbuckle, they are adjustable to the tension you need to limit movement.

RE: vertical log home shear design problem

Any idea if these logs are spiked together?  If so, size and spacing?  If there is enough, you may not need cables.

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: vertical log home shear design problem

(OP)
They don't appear to be spiked.  It looks as if there is a spline and chinking between each vertical log.  There is a top and bottom plate 2x10 that the logs are "possibly" nailed to with either toe nailed or end nailed 16d framing nails.   

RE: vertical log home shear design problem

Ouch.  Sounds like cables then...

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: vertical log home shear design problem

Not sure how much you can do & still preserve the historic nature..Use a 2x12 (or so) at the top and bottom of the logs, like crown moulding, and fasten each log with two (min) fasteners at each end to the 2x12's...esentially creating a little moment connection at each joint, like a portal frame with a lot of verticals close together. Not sure how much value you'll get out of that, but it's an idea.

RE: vertical log home shear design problem

Considering the dead load of the structure, no where near enough.

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: vertical log home shear design problem

I am repairing concrete pedestals that sit on existing footings for spalling.  The spalling is so bad the existing rebars are showing.  The existing rebars have corroded.  I submitted an initial design to completely replace the pedestals with new pedestals, but the cost was too great.  Now they want me to take a look at spalling repair.  The pedestals are only 8" square.  Any help especially pointing out a good ACI reference would be appreciated.

RE: vertical log home shear design problem

I don't have any expertise in this area, I'm just shocked that a building that is younger than I am is considered historic.

Michael.
Timing has a lot to do with the outcome of a rain dance.

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