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RE: What a Structural Engineer Should Memorize
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: What a Structural Engineer Should Memorize
- From: "Haan, Scott M POA" <Scott.M.Haan(--nospam--at)poa02.usace.army.mil>
- Date: Wed, 24 Aug 2005 10:16:12 -0700
Hem-fir no. 2 2x joists
40 psf live
1.5*nominal depth=span [ft] 16"
1.33*nominal depth=span [ft] 24"
From: Dave Adams
Sent: Wed 8/24/2005 8:11
Subject: What a Structural Engineer
compiling a list of facts & tidbits that I believe structural engineers
should commit to memory in an effort to bolster an ability to think on their
feet when confronted in the field or receiving that emergency phonecall.
Things that give a good "global" picture of what solutions might be practical
for a given situation before actually running numbers. These bits of
information are never intended as the means & ends, but basically a starting
point for discussing possible solutions to a problem.
Some of the things
that I've got on my list include:
1. The basic
allowable shear value of ONE 16d common nail in Doug Fir is about 140
2. The basic
allowable withdrawal value of ONE 16d common nail in Doug Fir is about 40
lbs/inch of penetration.
3. The basic
allowable single-shear value for ONE 5/8" diameter A307 machine bolt for a
steel-to-steel connection is about 3 kips.
4. The total
wind pressure for a single-story building design in 70 mph/Exp. C is about 20
5. The total
seismic design load in UBC Zone 3 for a wood-framed building will be about
are other considerations, such as the fact that toe-nails and end nails must
have their allowable values reduced, but the purpose of the list is just to give
us a BASIC starting point for thinking through s solution to a field
issue. The final numbers are rounded off and I felt that the lateral
loading figures should be bumped up a little when thinking a solution
through. There are certainly many more bits of info that are helpful to
commit to "quick-recall" memory and I'd like to hear if anyone else would like
to contribute to the list.
Dave K. Adams, S.E.