Correspondence 05/09/95 09:21 $503 288 0194 NORTHERN STEEL fl 002/005
' iiRY -05 -1995 10:12 CUBIC,DESIGNS 414 789 1970 P.01
be, -00
y`7 $'5 Gt/a o
DATE OF FAX : Hay 5, 1995
NUMBER FAXED TO:
THIS MESSAGE IS FROM:
Cubic Designs, inc.
13555 Bishop's Court
Brookfield, WI 53005
414-789 -1970 - Fax
TO: Steve Stone
COMPANY: Northern Steel
FROM: Mike Giffhorn
including cover sheet 1
3 page s a g ,`
COMMENTS:
Steve,
Regarding the Special Inspection issue for the Radio Shack
store in Tigard, we only specified the A325 Bolts because it
is a stock item for us- The loads on this mezzanine are so
low that an A307 bolt will work fine.
The following is a revised calculation sheet to substantiate
this change. This should alleviate the requirement for
special inspections.
Call me with any questions.
Mike
05/09/95 09:22 $503 288 0194 NORTHERN STEEL a004/005
INKY -05 -1995 10:12 CUB IC DESIGNS 414 789 1970 P.03
Pp
CHECK COLUMN TOP CONNECTION: A 3 01 P
LIVE LOAD = 125 PSF 0.750 IN. DIAMETER A32 BOLTS
DEAD LOAD = 8 PSF Sh = 3.00 IN
kw = 6 Sv = 7.00 IN - FRAMING DEPTH LESS 4"
I =(4) (Sh/2) ^2 +(4) (Sv /2)•2 = 58 IN ^4
GRAVITY LOADS: NS GRAVITY LOAD EACH END = Vns = 7200 #
EW GRAVITY LOAD EACH END = Vey = 1800 #
FROM COLUMN ANALYSIS: NS SEISMIC MOMENT = MEns = 53223 IN
EW SEISMIC MOMENT = MEew = 53223 IN
MOMENT AT (4) BOLTS: t = 2 IF BOLTS OCCUR TWICE PER DIRECTION AND
t = 1 IF BOLTS OCCUR ONCE PER DIRECTION
Pins = KEns x (3Rw /8) / t = 119752 IN (t = 1)
Mew = MEew x (3Rw /8) / t = 59876 IN (t = 2)
CHECK NS CONN:
BOLT SHEAR Vv = (Mns)(Sh /2) /I + (Vns) /4 = 4897 #
vh = (fins) (Sv /2) /I = 7226 #
Vr = ((Vv) ^2 +(Vh) = 8729 #
BOLT CAPACITY FROM (2) PLANES OF SHEAR =
(2)(9244)(1.7) _ -1544 # OK ✓ 08
1 142o /S 018 BEARING CAPACITY OF A 1/4 IN COLUMN TOP PLATE _
(0.250) (0.750) (0.9) (50000) (1.7) = 14344 # OK
BEARING CAPACITY OF 12 GA FRAMING =
(0.1046) (0.750) (2) (0.9) (50000) (1.7) = 12003 # OK
CHECK EW CONN:
BOLT SHEAR Vv = (Mew)(Sh /2) /I + (vev) /4 = 1999 #
Vh = (Mev) (Sv /2) /I = 3613 #
Vr = ((Vv) ^2 +(Vh) ^2)'0.5 = 4129 #
BOLT CAPACITY FROM (1) PLANE OF SHEAR =
( (��) ( = 7 # OK ✓ der'^' n
SEARING CAPACITY OF A 1/4 IN COLUMN TOP PLATE =
(0.250) (0.750) (0.9) (50000) (1.7) = 14344 # OK
BEARING CAPACITY OF 12 GA FRAMING =
(0_1046) (0.750) (1) (0.9) (50000) (1.7) = 6001 # OK
• TOTAL P.03
05/09/95 09:22 $503 288 0194 NORTHERN STEEL 1005/005
• ! Y-05 -1995 10:12 CUBIC DESIGNS 414 789 1970 P.02
DESIGN NOTES AND ASSUMPTIONS •
All Cubic Designs, Inc. systems are supported by columns anchored to
the floor slab with expansion anchors. Systems are designed such
that the columns provide lateral stability without bracing. The columns
are analyzed assuming a fixed top and a partially fixed base. Fixity at
the top is achieved via a bolted (A307) connection to the framing
ends. The columns and framing ends are designed for the appropriate
seismic zones. jYti, o
The framing system consists of cold formed channels using high
strength steel with a minimum yield of 50 KSI. The channels are
designed per the AISI steel code. Framing channels are positioned
with their open sides alternated wherever possible and braced along
the flanges (by the deck on top and by bridging on the bottom) to
prevent torsional deflection.
Framing members transfer loads (joist into a stringer or stringer into a
column top) via welded connections (hanger welded to a stringer) or
direct compression reaction (stringer end directly atop a column).
The deck system is either bar grating or roof deck. In the case of roof
deck, it is covered with either plywood or steel plate - neither cover is
counted on for strength purposes. The grating or roof deck is
designed for appropriate uniform and/or concentrated loads indicated.
•
j`'.., •
�.' ,ram
�T``l y of
Don 9 .. e;_P ,
9 7 f5 /1/a/ , 57 ie ,(itdoc 0- az) o
•
•
/
CITY OF TIGARD
OREGON
, -
Mr. Steven Stone
Northern Steel, Inc.
6633 N.E. 59th Place
Portland, OR 97218
RE: Radio Shack Mezzanine Addition
Plan Check #3-73C
Dear Mr. Stone:
The plans for the above project were reviewed for conformity with
applicable codes. Please complete the following item to complete
the plan review process:
A I' Have the owner complete and return the attached Special
Inspection form.
Please note that the owner, not the contractor, must employ the
Special Insp ctor.
Sincerely,
■/ /1
David Scott, .E.
Building Official
DS:wh
PRMSYS\DOCUMENT\BUP95_01.09\PC#373C.DOC
13125 SW Hall Blvd., Tigard, OR 97223 (503) 639-4171 TDD (503) 684-2772