Correspondence (14) 001° 26(-)y -OOo77
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November 15, 2010'
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James G. Pierson, Inc. If
Mark Van Domelen'''
Building Official s u
City of Tigard Fti GI"E e),
13125 SW Hall Blvd.
Tigard, Oregon 97223
Elevator Anchor Bolt
7105 SW Gonzaga
Application # BUP2009 -00077
Mr. Van Domelen,
As requested by the building contractor, I am investigating the holdown anchor bolt at the
elevator door that is part of the shear wall construction. My understanding is that cast -
in -place anchor was cut flush with the concrete during construction to allow for the
installation of the elevator cart and was replaced with a 7/8" epoxy anchor bolt. I also
understand that there is no record of the installation (or special inspection records) and
that the anchor has now been covered up with gypsum board. This anchor is about the
last item to resolve before the building can get final occupancy.
As we discussed, I can't tell you if the anchor was installed correctly as I was not aware
of the installation. One method to resolve this anchor issue could be a pull test to show
that it works for the loads although with the finishes all in place, this is a costly and
messy process. As we also discussed, I can provide the installation criteria that should of
been followed and understand that if the contractor will state that he met this criteria, it
will be an acceptable method to close out the issue.
The shear wall was designed with seismic loads controlling the anchor bolt design.
There is about 5,550 lbs of tension required on the holdown next to the elevator door.
For this load, we would of required a 5/8" or 7/8" drilled and epoxied anchor bolt with at
least 10" of embedment (using Simpson Set Epoxy or similar) into the 6" concrete stem
wall of the elevator pit. Per my understanding, they used a 7/8" bolt.
Please feel free to call and discuss the anchor further.
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Sincerely yours,
,`
'3
Peden G olberg, P.E., S.E.
CCU fien Principal ` � � � , O.
Cc: J. ourtes _..__.
Consulting Structural Engineers
610 S.W. Alder Street, Suite 918, Portland, Oregon 97205 Tel (503) 226 -1286 Pax: (503) 226 -3130