vertical log home shear design problem

Question

vertical log home shear design problem

firemedic (Structural)

(OP)

5 Dec 09 13:53

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 (Structural) · Answer 1 · 2009-12-05 16:01:11

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

msquared48 (Structural) · Answer 2 · 2009-12-06 01:30:17

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 (Structural) · Answer 3 · 2009-12-06 11:54:48

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.

http://www.eng-tips.com/viewthread.cfm?qid=260493&page=1

msquared48 (Structural) · Answer 4 · 2009-12-06 16:57:21

Ouch. Sounds like cables then...

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

jenDL (Civil/Environmental) · Answer 5 · 2009-12-10 20:12:12

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 (Structural) · Answer 6 · 2009-12-10 20:14:17

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

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

wailuku (Structural) · Answer 7 · 2010-02-11 04:45:19

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 (Structural) · Answer 8 · 2010-02-11 11:50:13

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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vertical log home shear design problem