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HomeMy WebLinkAboutWind Load Calculation Y 3.1 r-5 < M - rn n ® rn N n n o U Iv rn Broward County Fenestration Voluntary Wind Load Chart* < 3 Per ASCE 7-16 Part 1 and FBC(2020)for Retrofitting in Accordance with Formal Interpretation#24 for Detached One-and Two family dwellings and Multiple Single-Family Dwellings(Townhouses)with Mean Roof Height<_30 feet Wind 170 mph(3-second gust)/Exposure C**/Kd=0.85/Kzt=1.0/Pressures are in PSF/Not for use in Coastal(Exposure'D'areas) *Using Allowable Stress Design methodology(P=0.6w)/**Exposure C or D shall be determined according to ASCE 7-16 Section 26.7(Exposure Categories) Roof aind Wal,l:Zone Chart'Diagrams Wall Pressure Chart Flat Roof Uplift Chart Gable Roof Uplift Chart Hip Roof Uplift Chart am°1--:- �.a.{.�^ a 1 1 r I , 1 t 0 O 'IOi© 81 OI i Q b Qi O 10 bi 0` p O.bh 0.611i 7. ELEVATION 3 _ -t PLAN .PLAN - _3 a ...PI-AN .. Instructions on how to use these Charts: Determine Mean Roof Height,h,which is top of roof for flat roofs or the mean roof height for pitched roofs.Find your least horizontal dimension for your building,not including a overhang if it occurs. Calculate the value of,a,=101/o of least horizontal dimension or 0.4*h,whichever is smaller,but not less than either 4%of least horizontal dimension or 3 feet.If your roof height is less than 30 feet,but not exactly 15,20,or 25 feet,you will need to go to the next higher roof height.If your Mean Foof Height is higher than 30 feet,these charts do not apply. Review the diagram which illustrate the wall and roof zones and determine the wind zone in which the component is located.Determine the tributary area of the component.If the tributary area falls in between values,use the value of the smaller tributary area. Select the positive and negative wind pressures corresponding to the wall or roof zone where your component is located. Door pressures shown are for the most common door sizes and are worst case for heights<=30 Feet. WaII Prllssure For;All Roof Types Gara( e/Door,.Presstares Mean Roof Height 15 Ft 20 Ft <=30 Ft Tributary Area 10 20 35 50 100 500 10 20 35 50 100 500 Effective Wind Area Wall Positive Pressure 38.0 36.2 34.9 34.0 32.3 28.3 40.3 38.5 37.0 36.1 34.3 30.1 Width Height Positive Negative Zone 4 Negative Pressure -41.2 -39.5 -38.1 -37.2 -35.5 -31.5 -43.7 -41.9 -40.5 -39.5 -37.7 -33.5 8 8 38.6 -48.2 Zone 5 Negative Pressure -50. -47.4 -44.6 -42.9 -39.5 -31.5 -54.0 -50.4 -47.4 -45.6 -41.9 -33.5 10 10 37.4 -45.7 Mean Roof Height t 25 Ft 30 Ft 14 14 35.4 -41.8 Tributary Area 20 1 35 50 1 100 T 500 10 20 35 1 50 100 500 9 7 1 38.7 -48.3 Wall Positive Pressure 42. 40.4 1 38.8 37.8 35.9 31.5 43.9 41.9 40.3 39.3 37.3 32.8 16 7 37.0 -45.0 Zone 4 Negative Pressure 25. -143.9 -42.4 41.4 -39.5 -35.1 -47.6 -45.7 -44.1 -43.1 -41.1 -36.5 3 7 41.8 -54.6 Zone 5 Negative Pressure -56. 52.8 -49.7 -47.8 -43.9 -35.1 -58.8 -54.7 -51.7 -49.6 -45.7 -36.5 6 7 39.8 TV. Page 2 of 3