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To: 1_Rain_Drop

Never underestimate wind turbulence and uplift, which causes building failure. Board up those broken windows. If there are a lot of trees in close proximity to your home, board up your intact windows too.


162 posted on 10/28/2012 8:53:21 AM PDT by NautiNurse (Barack Obama--you are the weakest link. Goodbye!)
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To: NautiNurse

Direct wind pressure (even exclusive of turbulence, lift, and torsional effects) gets formidible for higher category hurricanes as you well know. But at 75 MPH the pressure is still under 20 lbs/sq ft. Gusts can take the wind speed 50% above that, where the pressure will DOUBLE. For those areas that get say only 60 MPH gusts from this there will be only minor wind damage to structures (but possibility of many power lines down).

Figure 8
Velocity pressure as a function of wind speed
(From ASCE, 1990)

Wind Speed 75 95 110 130 155 180 200
(mph)

Velocity 19.0 30.6 41.0 57.2 81.3 109.7 135.0
Pressure
(psf)


169 posted on 10/28/2012 9:10:35 AM PDT by steve86 (Acerbic by nature not nurture TM)
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