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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
4 Terrain Amplification of Wind Loads in Northern Guam
Terrain Can Affect Wind Speed
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
7 Terrain Amplification of Wind Loads in Northern Guam
Finegayan Cliff-line
12/14/2010
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
10 Terrain Amplification of Wind Loads in Northern Guam
Way Ahead• Are products commercially available
that meet terrain amplified wind loads requirements?
• What are the BEST commercially available products?
• Are customized products cost effective?
• What are the risks?