HomeMy WebLinkAboutPermit Field Test & Inspection Report 2007-2-15
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ENGINEERING
February 15, 2007
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Mr. Tim Hovet
Sycan Development Corporation
840 Beltline Road, Suite 202
Springfield, OR 97477
Ref.: Alternate Mechanical Unit Support
Gateway 3346
AAI Project No, A06011
Dear Mr, Hovet:
Kaz Kawamoto ofMegaPacific Company has }'~v}'osed an alternate design for the support of the
rooftop mechanical units at the Gateway 3346 Retail Center. The pwposed support detail is
attached.
The flat C5x6,7 channel support is adequate for the design loads .dVJ..Ll the unit and roof snow
provided the mechanical umts have their long sides centered between the joists, The mechanical
units must be centered between the joists and the units must be spaced to provide one unloaded
joist bay between them, The W' diameter bolts at each end of each channel are adequate for the
wllld and seismic anchorage of the unit. As shown, the W' diameter bolts run between the top
chord angles of the supporting joists, A W' x 2" x 2" plate washer should be supplied below the
angle legs for bearing ofthe hex nut and washer connection. '
In order to minimize additional details, the mechanical units can be placed within 1'-0" either
side of the Joist girder centerline to allow for the same flat channel detail and connection to the
joists. See the attached sketch for pwpOsed mechanical unit placement.
The connection of the mechanical unit to the flat channel shall be a mimmum of (4) #10 screws
equally spaced along each long side,
This alternate design can replace the connections detailed previously for the mechanical units in
both building provided the above criteria are met. The previous design was provided to support
the mechanical units based on the mechanical engineers layout. If the placement of the units can
be adjusted to meet the above criteria, then the alternate design is acceptable.
If there are any questions or CvlillUents, please do not hesitate to call,
Sincerely,
)
Steve Y ung, PE SE
Project Manager
4875 SW Griffith Drive I Suite 300 I Beaverton. OR 197005
503.620.3030 I tel
503,620.55391 fax
www.aaleng.com
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