1907 Lumber Values.
1907 Lumber Values.
(OP)
The Carnegie Pocket Companion-1923 which SlideRuleEra has talked about before, gives design values for wood.
Those design values are quiet high, so I am unsure of how to apply them for use in evaluating wood from a building built in early 1900. Does anyone have any suggestions?
I am trying to get an estimate of what design values may have been use in order to determine the orginal loads that a building was designed for.
Those design values are quiet high, so I am unsure of how to apply them for use in evaluating wood from a building built in early 1900. Does anyone have any suggestions?
I am trying to get an estimate of what design values may have been use in order to determine the orginal loads that a building was designed for.






RE: 1907 Lumber Values.
RE: 1907 Lumber Values.
I agree that this would make the allowable working stresses quite high by today's standards. Engineer's in the early 20th century do not appear to have had knowledge of "load duration". I have never seen that issue even discussed in publications from that time. Also they were willing to accept a much smaller safety factor then (typically 6 to 1, and if the 50% increase is taken into account it becomes only 4 to 1). This probably had to do with the fact that almost all timber used at that time was high quality, not the wider variability seen today.
In summary, IMHO, for a building that meets the above requirement, I would apply the 50% increase. This would be to determine what the ORIGINAL design loads were. But... I certainly would not say that the structure is safe (by today's standards) at those loads.
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