vertical log home shear design problem

[firemedic]

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?

 

[Ron]

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

 

[msquared48]

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

 

[firemedic]

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.

 

[msquared48]

Ouch. Sounds like cables then...

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

 

[jenDL]

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.

 

[msquared48]

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

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

 

[wailuku]

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.

 

[paddingtongreen]

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.