Florida Coastal Monitoring Program Hurricane Wind Data Collection

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Florida Coastal Monitoring ProgramHurricane Wind
Data Collection

• Kurt Gurley University of Florida
• Forrest Masters Florida International
  University
• Tim Reinhold Institute for Business and Home
  Safety
• David Prevatt Clemson University

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Florida Coastal Monitoring Program

• Measure in-field hurricane ground level wind
  velocities and relay data in real-time to
  emergency managers, forecasters and researchers
• Measure the hurricane wind pressures on
  residential structures
• Test capacity of building components
• Statistical Assessment of structural damage
  post-event
• Model structural vulnerability, and investigate
  mitigation measures

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Motivation for Research

• Knowledge of ground-level winds used by
• Atmospheric scientists
• Boundary layer transition during hurricane
  landfall
• Peak and mean speeds for model calibration
• Validation of remote sensing technology
• Emergency managers
• Estimate
• Physical damage (buildings and lifelines)
• social and economic impacts
• Assignment of limited resources

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Motivation for Research

• Knowledge of ground-level winds used by
• Wind and civil engineers
• Modeling the Damage Chain
• Wind speeds at higher elevations
• Wind speeds near ground level
• Wind pressure on structures
• Wind damage prevention measures
• Outcomes
• Wind tunnel modeling
• Building codes and standards with accurate load
  information

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Portable Weather Stations

• Stiff 10-m Steel Lattice Tower
• Remain stable in 200 mph winds
• Self-powered
• Instruments collect wind speed and environmental
  data
• Quick setup to hasten retreat from approaching
  storm

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Tower in Atlantic Beach, NCIsabel, 2003
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Navarre Causeway Dennis 2005
Peak 3-sec gust of 120 mph at 5 meters
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Tower Data

• Time histories of wind speed over the duration of
  the hurricane
• Statistical analysis reveals information needed
  for engineering design to resist the wind

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Real-time Data Transmission
GOES SATELLITE
MIRRORWEB SERVERS
NOAADCS
FIELD
NOAA
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NOAA Hurricane Research DivisionMaximum
Sustained Wind Swath
Tower data is one of the sources of ground data
input to HWIND contour model of wind speeds
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Fleet of 5 towers (6 for 2006 season)
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Program Website www.ce.ufl.edu/fcmp
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FCMP Instrumented Homes Measure Hurricane Wind
Pressure

• 32 homes along Florida coast
• Owners receive free retrofits
• storm shutters, new roof, gable bracing, braced
  garage door, etc.
• Sensors record uplift roof pressure

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Hurricane FrancesWinds on House Jensen Beach
Study to Compare full-scale to Wind tunnel
model to ASCE 7 loads
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Hurricane FrancesWinds on House Jensen Beach
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Frances Peak 3-sec Gusts
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Hurricane Frances Eye Wall
Eyewall Peak 3-second gust 82 m.p.h.
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Ivan Category 3 ? Not Based on Measurements
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Jeanne Peak 3-sec Gusts
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Wilma Measured Peak Winds
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Structural Resistance

• Using real houses being demolished
• In-field testing to quantify actual loads to
  failure
• Relate back to wind speed
• Test as-built and retrofitted

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Failure Capacity Testing

• DCA project to determine ultimate loads to
  failure for as-built and retrofitted structures

• As-built roof to wall toe-nail connections

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Failure Capacity Testing

• Retrofit with modern roof to wall connections
• Uplift capacity increased by factor of 5 with
  simple retrofit
• Loads to be converted to wind speed

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Post EventDamage Documentation
Jeanne, 2004
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Post Event Damage Documentation
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Window PerformanceCharley 2004 -Charlotte
County
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Computational Modeling of Structural Vulnerability

• Model the capacity of building components
• Apply wind loads
• Calculate probability of damage to building

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Mitigation Studies

• How would these curves (risks) change if we added
  strength?
• Hurricane shutters
• More nails
• Easily incorporated into the structural model
• Leads to comparative cost effectiveness ()
• May be applied to other types of structures

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Thank you. Any questions?

• Project website
• www.ce.ufl.edu/fcmp