Historical Timber Values?
Historical Timber Values?
(OP)
I'm looking at a document I pulled off of Slide_Rule_Era's website, "Pole Building Design". In an example on pg. 13 it lists the design value of wood poles using Douglas fir or Southern Pine as "8,000 psi, USA rating." The document was first published in 1957 and revised several times, the last being 1969.
So, my question is, were design values that high really used then? Or is the "USA rating" some specific criteria of which I'm unaware? Or am I missing something?
So, my question is, were design values that high really used then? Or is the "USA rating" some specific criteria of which I'm unaware? Or am I missing something?






RE: Historical Timber Values?
RE: Historical Timber Values?
I wonder if that 8000 psi value was an ultimate value, with no safety factor for actual design. Seems awfully high to me.
Mike McCann
MMC Engineering
RE: Historical Timber Values?
That is certainly plausible.
RE: Historical Timber Values?
BA
RE: Historical Timber Values?
And good call on the short duration as well. At the end of that page and on the beginning of the next one the author discusses load duration. An excerpt: "Wind load, on the other hand, is a transient, fluctuating load. Wen its maximum occurs, it is an extreme that lasts for only a breif period. These extremes seldom occur in conjunction with maximum live loads."
Y'all are good!
RE: Historical Timber Values?