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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)

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Asce 7 10 wind speed map

ASCE 7-10 Wind Speed Map

Peter J. Vickery

Applied Research Associates, Inc.

8537 Six Forks Road, Suite 600

Raleigh, NC, 27615


Summary
Summary

  • 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


V 700 1 6
V700/√1.6


V 700 1 61
V700/√1.6

  • ASCE 7-05

  • ASCE 7-10 Equivalent




















Asce 7 10 wind speed map

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













Summary1
Summary

  • 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.


Windborne debris region
Windborne Debris Region

  • 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