1 / 38

# ASCE 7-10 Wind Speed Map - PowerPoint PPT Presentation

ASCE 7-10 Wind Speed Map. Peter J. Vickery Applied Research Associates, Inc. 8537 Six Forks Road, Suite 600 Raleigh, NC, 27615. Summary. New Hurricane Simulation Model Windfield Filling (weakening after landfall) Holland B (pressure-wind Relationship)

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'ASCE 7-10 Wind Speed Map' - kemp

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### ASCE 7-10 Wind Speed Map

Peter J. Vickery

Applied Research Associates, Inc.

8537 Six Forks Road, Suite 600

Raleigh, NC, 27615

• New Hurricane Simulation Model

• Windfield

• Filling (weakening after landfall)

• Holland B (pressure-wind Relationship)

• Tracks and pressures (Landfall location and intensity)

• Results in Lower Design Wind Speeds

• Moving to strength wind speed map (wind load factor = 1 for strength design, 0.63 for ASD)

• Strength map corresponds to 700 year RP

• ASCE 7-05 Equivalent Map = V700/√1.6

• Cat III and IV structures use 1700 year RP winds

• Cat I structures use 300 year RP winds

V700/√1.6

V700/√1.6

• ASCE 7-05

• ASCE 7-10 Equivalent

QUESTION:If the new model produces more intense hurricanes (defined by pressure) than the old model, why have the design wind speeds gone down?

ANSWER:Because of the New Model for the Holland B Parameter

• New model produces more landfall intense hurricanes by pressure than the model used to develop ASCE 7, yet results in lower wind speeds.

• Additional flight level data and improved statistical model for B resulted in lower ~10% estimates of the Holland B parameter.

• In some areas (e.g. Florida Panhandle) the new model produces fewer land falling strong hurricanes, and hence wind speeds are lower than associated with the reduction of B alone.

• Current Standard

• V > 120 or 110 within one mile of coast

• Exact Mapping (new 700 year map)

• 120√1.6=152~150

• 110 √1.6=139~140

• New WBDR is intended to mimic current standard, pending new research

• V > 140 or 130 within one mile of coast

• Results in less area within WBD Region that the existing standard