terrain amplification of wind loads in northern guam · 2010 navfac pacific/hawaii designer &...
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1 Terrain Amplification of Wind Loads in Northern Guam
Terrain Amplification of Wind Loads in Northern Guam
2010 NAVFAC Pacific/HawaiiDesigner & Builder Symposium
Wednesday, 1 December, 2010Hilton Hawaiian Village-Coral Ballroom
2 Terrain Amplification of Wind Loads in Northern Guam
Structural Criteria Update•UFC 1-200-01 General Building Requirements
–16 Aug ‘10–Adopts IBC 2009 and ASCE 7-05
•UFC 3-301-01 Structural Engineering–27 Jan ‘10, with Change 1 – 20 Jul ’10–Based on IBC 2006 and ASCE 7-05
•UFC 3-310-04 Seismic Design for Buildings–22 Jun ‘07, with Change 1 – 27 Jan ’10–Based on IBC 2003 and ASCE 7-02
3 Terrain Amplification of Wind Loads in Northern Guam
Wind Design Criteria•170 mph Basic Wind Speed
•Exposure C (per IBC 2009, ASCE 7-05)
•Occupancy Categories & Importance Factors per UFC 3-301-01 Structural Engineering
So What’s Unique about Northern Guam?
TERRAIN AMPLIFICATIONof WIND LOADS
5 Terrain Amplification of Wind Loads in Northern Guam
Crest of Cliff-line 300 ft high (west)to almost 600 ft high (east)
Finegayan
North Ramp
Andersen South
½ mile to 1 mile zoneWind loads up-to-doublebaseline Guam conditions
Northern Guam Wind Terrain Amplification
6 Terrain Amplification of Wind Loads in Northern Guam
FinegayanTerrain Effects
12/14/2010
Crest of cliff-line
Shoreline
Route 3
8 Terrain Amplification of Wind Loads in Northern Guam
Terrain-amplified Wind Impacts
•Relatively small impact to Building “Shell.”
–Reinforced Concrete Systems usually governed by seismic.
–Some impact to precast/prestressed roof systems.
–Some impact to exterior walls that span high floor-to-floor heights.
•Potential Impact to Components and Cladding (i.e. window, roofing materials, etc.)
9 Terrain Amplification of Wind Loads in Northern Guam
Components & Cladding Wind Loads
Wind Pressures (psf) for various building surfaces
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