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Fw: structures & ethics[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "Seaint@Seaint. Org" <seaint(--nospam--at)seaint.org>
- Subject: Fw: structures & ethics
- From: "S. Gordin" <mailbox(--nospam--at)sgeconsulting.com>
- Date: Mon, 22 Nov 2004 12:39:29 -0800
According to Wood Handbook, USDA Forest Service, Table 4-3b, the as-tested complete failure stresses in Douglas-Fur Coast, @12% moisture: compression parallel to grain - 7,230 PSI, modulus of rupture - 12,400 PSI.
Compare it to the allowable values with all possible factors - and you will get a safety factor of 6 or more against the ultimate failure of an ideal specimen.
I would think that even with the obvious difference between the ideal and reality, the assumption of the safety factor of 4 appears valid.
At the same time, I most certainly agree that the engineered wood products have a much lower safety factor.
Steve Gordin, SE
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