To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
Subject: wall anchorage / ubc / simpson
From: David Adie <dadie(--nospam--at)bjginc.com>
Date: Wed, 13 Jun 2001 13:44:54 -0700
after designing wall anchorage with asd and a simpson pai purlin anchor, i
got a plan check comment stating that i need to increase my loads due to ubc
do i need to increase the loads 40% and possibly change the purlin anchor,
or is the 40% increase "built in" to the simpson allowable properties
somehow? if it is "built in" somewhere - can someone please specify where
that is documented?
this particular ubc criteria talks about "strength design forces" - aka
lrfd. does this mean i need to factor my loads by 1.4 to get from asd back
to strength level, then factor by 1.4 again to satisfy the wall anchorage
criteria? all this to get a lrfd level force. then get an ultimate load
from simpson and multiply with a resistance factor - right?
my 2001 simpson catalog, pg. 7, instructions to the designer, note j,
references AF&PA/ASCE 16-95 for a design procedure (which my firm does not
have in its library) - but they also tell the designer to call simpson for
"reference lateral resistances". unfortunately, after calling them, they
did not have that info. - all they could do was fax me a page from their
Canadian catalog which lists the ultimate loads for the purlin anchor.
any help would be appreciated.
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