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14370 SW MISTLETOE AVE
RNB LEE Document No. JEREMY 14370
Jun-16
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CITY OF TIGARD
REVIEWER FOR CODE COMPLIANCE
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TITLE: Structural Calculations BY: RRL PROJECT No.:
DATE: `6/10/2016
PROJECT: OWNER: PAGE:
Jeremy Patio cover Jeremy Cover
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Portland OR 97225 rnbengineeringusa@gmail.com
Date:01/01/2015 foikkkAteoe,y
WASHINGTON COUNTY-ENGINEERING STRUCTURAL DESIGN CRITERIA
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The current state building code governing commercial and engineered residential construction is the
2014 Oregon Structural Specialty Code(OSSC).
Seismic:
• Site specific seismic design parameters may be determined based upon using the following
USGS link: http://earthquake.usgs.gov/designmaps/us/application.php and selecting 2012
International Building Code as the design code reference document per 2014 OSSC 1613.3.1.
• Site Class D shall be used unless the Building Official or geotechnical report determines Site Class
E or F soils are present at the site.
Wind:
Design wind pressures are to be determined using the 3-second gust wind speed and the procedures of
the 2010 edition of Minimum Design Loads for Buildings and Other Structures(ASCE 7-10)or in
accordance with the alternate method contained in the OSSC.The design wind speeds(3-second gust)
for WA County are: Risk Category Vult(mph) Vasd (mph)
115 89
I{ 120 93
in, IV 130 101
Wind exposure category must be determined by the Engineer of Record based upon site conditions.
Snow:
• Per 2014 OSSC,Ground snow load is based on Snow Load Analysis for Oregon as published by
the Structural Engineer Association of Oregon. Ground snow loads at a specific site can be
determined at the following link: http://snowload.seao.org/lookup.html
Soils:
Foundation and retaining wall design parameters may be based upon the presumptive load-bearing
values per 2014 OSSC Table 1806.2,or as justified by submission of a Geotechnical Report.
• Default allowable foundation bearing capacity within WA County is 1,500 psf.
• Default lateral soil loads shall be 40 psf/ft for laterally unrestrained retaining walls and 55 psf/ft
for laterally restrained retaining walls(basement walls). Lateral pressures for walls supporting
sloping backfill or surcharge loads must be determined by a Geotechnical Report.
• Minimum frost depth is 12-inches for elevations less than 500-ft. Minimum frost depth is 18-
inches for elevations greater than or equal to 500-ft unless the Building Official determines that
a deeper frost depth is required for the site.
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