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Seismic Retrofit of Log Structure

Seismic Retrofit of Log Structure

Seismic Retrofit of Log Structure

(OP)
Hi Everyone,

I am working on 6 year old log structure that requires a seismic upgrade due to occupancy change.

Sofar I have come up with a vertical angle both faces of the wall with a lag screws in long-slotted vertical holes to allow for drying shrinkage of the logs.  At the top, rods are welded via coupling nuts to each angle which in turn are connected to compression springs. A steel tube cantilevering over the logs supports the compression springs each face of the wall.

It seems there must be a more economic way to seismically reinforce a log structure as an after thought.

Any ideas or experiences?

Eric McDonald, PE
McDonald Structural Engineering, PLLC

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