why don't post foundations tip over?

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Old 11-27-13, 11:12 PM
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why don't post foundations tip over?

My 900 sq ft cottage is resting on 12" diameter logs about 4 ft long.
Standing vertically and resting on flat rocks and not affixed to beams.
The beams are also about 12"diameter l
ogs. Some have sunk into the top soil so: m jacking and putting in concrete footings.



House is 70 yrs old.
 
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Old 11-27-13, 11:34 PM
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Log beams are probably pinned to the columns, with steel dowels. Horizontal forces exerted on tops of columns are less than the sum of vertical forces multiplied by coefficient of friction between beams and columns, and resisting shear forces in pins.
 
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Old 11-28-13, 06:37 AM
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As long as the pier has weight on it the top is stuck to your floor joist and the bottom is stuck to the ground. You are correct though. It has very little resistance to side-to-side motion and they can tip over. If you have solid perimeter foundation walls they generally keep the building from moving sideways so the piers in the center only have to support weight vertically.
 
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