Are you really seeing mostly doug fir? In Pugetopolis it seems I mostly see "HemFir". I haven't seen market numbers. Hemfir as I understand it is Western Hemlock and several of the true fir species.
Yours, Bruce Verhei -------------- Original message ---------------------- From: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> > Bob, > > Your conclusion is correct, however I would double check the designation > of the SG for Douglas Fir. > My reference book on this is "Modern Timber Engineering", and Table L in > that document shows the > SG for Doug Fir as 0.51, which would mean your multiplier would be 1.25, > resulting in a maximum > load of 250 pounds (200 x 1.25) in the configuration you described . > > It's sort of interesting, in looking at the table I noted, there are > only two types of wood with an SG > less than 0.35, and all of the others are larger, suggesting the values > in the tables are most likely to > be increased when applying this modifier. The lower SG types are > Northern White Cedar (0.32), > Western Red Cedar (0.34). > > PARSLEY CONSULTING > Ken Wagoner, SET > 760.745.6181 voice > 760.745.0537 fax > [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> e-mail > www.ParsleyConsulting.com <http://www.ParsleyConsulting.com> website > > > > Bob Knight wrote: > > Good morning, > > I was asked a question a couple of days ago about the specific gravity of > > wood in relation to FIGURE 9.3.5.9.1. I think I understand what is being > > shown, but I would like verification. The tables within this figure showing > > through-bolts and lag screws in wood has a footnote that states the specific > > gravity of 0.35 was used in the table. It then states that a multiplier > > can be used for other types of wood. So, here in the west Douglas fir is > > the wood of choice. It has a specific gravity of 0.45. If I grasp this > > correctly, this allows me to use a multiplier of 1.17 to adjust the > > allowable loads found in the figure. For example a 1/2" through bolt in > > wood with a length of 1-1/2" is allowed 200 lbs when using angle C. > > Applying the multiplier increases that allowable load to 234 lbs. Do I > > understand this correctly? Thanks for your help. > > > > Bob Knight, CET > > (208) 495-2057 > > [EMAIL PROTECTED] > > www.firebyknight.com > > > > > > No virus found in this outgoing message. > > Checked by AVG Free Edition. > > Version: 7.5.516 / Virus Database: 269.20.8/1287 - Release Date: 2/19/2008 > > 10:55 AM > > > > > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > > > To Unsubscribe, send an email to:[EMAIL PROTECTED] > > (Put the word unsubscribe in the subject field) > > > > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
