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Stone Shifting 3
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Steve Gray
Steve Gray
931 posts

Re: Pre-shaped logs
Sep 02, 2003, 22:33
I had imagined that the overlap points of the logs would all be beneath the stone. That way there is no bending load on any of the logs and we rely entirely on the compressive strength of the timber, which is considerable and gives us a good safety margin. If we don't do this I would find it hard to provide convincing stress calculations unless we used stress graded timber (for which bending moments are known) and violate our historical integrity.

If the laps are all beneath the stone, I don't think we need proper joints. The logs cannot carry such a load on round surfaces without deforming into flattened contact areas, but if you really feel it is necessary, you could cut notches that have a 4" square bearing surface and a sloping shoulder on all 4 sides of the square. The slopes on the top of the log would go upwards whereas the slopes on the sides of the log would go down. As long as the angle is the same, all timbers will fit together perfectly regardless of the size of the log.
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Re: Pre-shaped logs (GordonP)
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