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HomeMy WebLinkAboutWind Load CalculationDocuSign Envelope ID: 98043D48-BO2A-4A74-BB55-ADOFIAADBDIC FL Design Build Inspect CRC1331263 I AA26003142 I H110776 Architecture + Construction + Home Inspection 772.321.4500 1 frank.liebler@gmail.com 4/20/20 To: Doug Harvey, St Lucie County Building Department Re: permit # 2002-0374, 2002-0377, 2002-0379, 2002-0396 See revised plans dated 4/20/20 as per your comments via phone. Also see attached, MWFRS wind calcs used for structural wind loads. Thank you, Docu3igneE i,y: E rz ULt � Eg35FAF3,,,24,,-. 4/20/2020 Frank Liebler Owner / Architect / Contractor FL Design Build Inspect Construction + Architecture + Home Inspection CRC1331263 I AA26003142 I H110776 frank.I iebler@gmail.com c 772.321.4500 REVIEWED FOR CODE COMPLIANCE ST. LUCIE COUNTY BOCC FILE COPS' BLDG DEPT CORRESPONDENCE 11 of 1 1, DocuSign Envelope ID: 98043D48-BO2A-4A74-BB55-ADOFIAADBDIC BREEZEWAY WIND (MWFRS - Open Building) Wind Analysis Method Basic Wind Speed (ultimate) Topography Factor Directionality Factor Gust Effect Factor Roof Pitch Roof Eve Height Peak Roof Height Mean Roof Height Terrain Exp. Category Velocity Pressures Height (ft) h = 9.50 L= 11.5 B= 18 Design Pressures Transverse Direction: Analytic Directional Procedure 145.00 MPH K:t= 1.00 Kd = 0.85 G = 0.85 Kz qh FT 0.849 38.84 LIB = 0.64 h)L = 0.83 2.00 :12 9.500 FT 10.500 FT 9.500 FT C psf Job#: ASCE 7-10 Fig. 27.4-5.27.4-7 ASCE 7-10 Fig. 26.8-1 ASCE 7-10 Fig. 26.6-1 ASCE 7-10 Sec. 26.9.1 9.46 DEG a = 9.5 zg = 900 qz=.00256KzKztKd V2 L= Span of Pitched Rod B = Length of Building p=qn GCN Note: Pressures are bred slate design pressures for strength design.. Multiple by as for Aso. (WBN dimWon peryendicular to doge.) Design Pressure lost) h (ft) qh (psf) CNw CNL ghGCNvy ghGCNL Load Case A Clear Wnd Flow 9.50 38.84 1.100 -0.326 36.31 -10.77 Load Case B: Clear Wnd Flow 9.50 38.84 0.174 -1.174 5.74 -38.75 Load Case A: Obstructed Wnd Flow 9.50 38.84 -1.495 -1.000 -49.36 -33.01 Load Case B: Obstructed Wnd Flow 9.50 38.84 -0.822 -1.674 -27.12 55.26' Longitudinal Direction: Note: Pressures ere lthut state design pressures for strength design. Multiple by0.6for ASe- (Wrol direction parallel to ridge.) Design Pressure (psf) Distance (R) qh (psf) Cry ghGCN Load Case A Clear Wnd Flow (0.to h12) . 38.84 -0.80 -26.41 (h to 2hb 38.84 -0.60 -19.81 (>2h) _ 38.84 -0.30 -9.90 Load Case S: Clear Wind Flow (0, to h/2) 38.84 0.80 26.41 (h to 2h) 38.84 0.50 16.51 -(>2h) 38.84 0.30 9.90 Load Case A: Obstructed Wnd Flow (0 to h)2) 38.84 -1.20 -39.61 (h to 2h) 38.84 -0.90 -29.71 (>2h) 38.84 -0.60 -19.81 Load Case B: Obstructed Wnd Flow (0 to h/2) 38.84 0.50 16.51 (h to 2h) 38.84 0.50 16.51 (>2h) 38.84 0.30 9.90 MWFRS Calculator- Open Bwldrg Rev.1.00 - 3ffi2016 Copyright ® 2016-Medeek Engineering Inc. DocuSign Envelope ID: 98043D48-BO2A-4A74-BB55-ADOFIAADBDIC GAZEBO WIND (MWFRS - Open Building) Wind Analysis Method Basic Wind Speed (ultimate) Topography Factor Directionality Factor Gust Effect Factor Roof Pitch Roof Eve Height Peak Roof Height Mean Roof Height Terrain Exp. Category Velocity Pressures Height (ft) h = 8.75 L = 20 B= 14 Design Pressures Transverse Direction: Analytic Directional Procedure 145.00 MPH Kzt= 1.00 Kd = 0.85 G = 0.85 Kz qh FT 0.849 3B.84 L/B= 1.43 h/L = 0.44 3.00 :12 8.000 FT 9.500 FT 8.750 FT C psf Job#: ASCE 7-10 Fig. 27.4-5, 27.4-7 ASCE 7-10 Fig. 26.8-1 ASCE 7-10 Fig, 26.6-1 ASCE 7-10 Said, 25.9.1 14.04 DEG a = 9.5 zg = 900 qz=.00256K2KztKd V2 L = Span of Pitched Roof S = Length of Building p = q h GC Note: Pressures are limit state design pressures for strength design. Multiple by 0.6 for ASD. (W1nd direction perpendicular W road) Design Pressure (psf) h (ft) qh (PSI) CNW CNL ghGCNW ghGCNL Load Case A: Clear Wind Flow 8.75 38.84 1.100 -0.387 36.31 -12.78 Load Case B: Clear Wind Flow 8.75 38.84 0.113 -1.113 3.73 _-36.74j Load Case A: Obstructed Wnd Flow 8.75 38.84 -1.251 -1.000 -41.31 -33.01 Load Case B: Obstructed Wind Flow 8.75 38.84 -0.639 -1.613 -21.08 -53.24 Longitudinal Direction: Note: Pressures are limit state design pressures for strength design Mulfiplebyttalc ASD. (Wnd olfaction parallel to ridge.) Design Pressure (psf) Distance (ft) qh (psf) Cry ghGCN Load Case A: Clear Wind Flow (0 to h/2) 38.84 -0.80 -26.41 (h to 2h) 38.84 -0.60 -19.81 (>2h) 38.84 -0.30 -9.9D Load Case B: Clear Wind Flow (0 to h/2) 38.84 0.80 26.41 (h to 2h) 38.84 0.60 16.51 (>2h) 38.84 0.30 9.90 Load Case A: Obstructed Wind Flow (0 t0 h/2) 38.84 -1.20 -39.61 (h to 2h) 38.84 -0.90 -29.71 (>21h) 38.84 -0.60 -19.81 Lead Case B: Obstructed lNnd Flow (0 to hi 38.84 0.50 16.51 (h to 2h) 38.84 0.50 16.51 (>21r) 38.84 0.30 9.90 MWFRS Calculator - Open Building Rev. 1AD-W82016 copyright 0 2018 - Medeek Engineering Inc. r. to DocuSign Envelope ID: 98043D48-BO2A-4A74-BB55-ADOFIAADBDIC PORCH @ POLE BARN WIND (MWFRS - Open Building) Wnd Analysis Method Basic Wind Speed (ultimate) Topography Factor Directionality Factor Gust Effect Factor Roof Pitch Roof Eve Height Peak Roof Height Mean Roof Height Terrain Exp. Category Velocity Pressures Height (ft) h = 8.00 L = 10.5 B = 36 Design Pressures Transverse Direction: Analytic Directional Procedure 145.00 MPH K2t= 1.00 Kd = 0.85 G = 0.85 Kz qh FT 0.849 38.84 L/B = 0.29 h/L = 0.76 2.00 :12 8.000 FT 9.000 FT 8.000 FT C psf Job#: ASCE7-10 Fig. 27.4-5, 27.4-7 ASCE 7-10 Fig. 26.8-1 ASCE 7-10 Fig. 26.6-1 ASCE 7-10 Sec. 26.9.1 9.46 DEG a= 9.5 zg = 900 qz=.00256KzKzrKd V2 L = Span of Pitched Roof B = Length of Building p=qh GCN Note: Pressures am limit stale design pressures for strength design. Multiple by a6 for ASO. (Wnd direction pemendicular to ridge.) Design Pressure (psf) h (ft) qh (PSO CNW CNL ghGDNW ghGCNL Load Case A: Clear Wind Flow 8.00 38.84 1.100 -0.326 36.31 -10.77 Load Case B: Clear Wind Flow 8.00 38.84 0.174 -1.174 5.74 -38.75 Load Case A: Obstructed Wnd Flow 8.00 38.84 -1.495 -1.000 -49.36_ -33.01t Load Case B: Obstructed Wnd Flow 8.00 38.84 -0.822 -1.674 -27.12 -55.261. Lon.gitudlnal Direction: Note: Pressures ere limit state design pressures for strength design. Multiple by 0.6 far ASO, (Wnd direction parallel to ridge.) Design Pressure (psf) Distance (ft) qh (pst) CN ghGCN Load Case A: Clear Wind Flow (0 to h/2) 38.84 -0.80 -26.41 (h to 2h) 38.84 -0.60 -19.81 (>21h) 38.84 -0.30 -9.90 Load Case B: Clear Wnd Flow (0 to h/2) 38.84 0.80 26.41 (h to 2h) 38.94 0.50 16.51 (>2h) 38.84 0.30 9.90 Load Case A: Obstructed Wnd Flow (0 to h/2) 38.84 -1.20 -39.61 (h to 2h) 38.84 -0.90 -29.71 (>2h) 38.84 -0.60 -19.81 Load Case B: Obstructed Wnd Flow (0 to h/2) 38.84 0.50 16.51 (h to 2h) 38.84 0.50 16.51 (>21h) 38.84 0.30 9.90 MWFRS Calculator- Open Building Rev. 1.0.0-3 1316 Copyright 0 2016 - Medeek Engineering Inc. , DocuSign Envelope ID: 98043D48-BO2A-4A74-BB55-ADOFIAADBDIC MINIMUM DESIGN LOADS Main Wind Force Resisting System- Part 1 0.255 lt/L!5 1.0 Figure 27.44 Net Pressure CoefFcient, CN MOnoslope Free Roofs Open Buildings 0 5 450, y = 00, 1800 L IIL�' �0.5 L� , � CNL' OI Wind CNL Direction h 0 Wind Direction Y= 180° Roof Angle 0 Load Case Wind Direction, y= On Wind Direction, 7 =180e Clear Wind Flow Obstructed Wind Flow Clear Wind Flow Obstructed Wind Flow CNW CNL CNw CNL CNW CNL CNW CNL 00 A 1.2 0.3 -0.5 -1.2 1.2 0.3 -0.5 -1.2 B -1.1 -0.1 -1.1 -0.6 -1.1 -0.1 -1.1 -0.6 7.50 A -0.6 -1 -1 -1.5 0.9 1.5 -0.2 -1.2 B -1.4 0 -1.7 -0.8 1.6 0.3 0.8 -0.3 150 A -0:9 -1.3 -1.1 -1.5 1.3 1.6 0.4 -1.1 B -1.9 0 -2.1 -0.6 1.8 0.6 1.2 -0.3 22.50 A -1.5 -1.6 -1.5 -1.7 1.7 1.8 0.5 -1 B -2.4 -0.3 -2.3 -0.9 2.2 0.7 1.3 0 300 A -1.8 -1.8 -1.5 -1.8 2.1 2.1 0.6 -1 B -2.5 -0.5 -2.3 -1.1 2.6 1 1.6 0.1 37.5e A -1.8 -1.8 -1.5 -1.8 2.1 2.2 0.7 -0.9 B -2.4 -0.6 72 -1.1 2.7 1.1 1.9 0.3 45e A -1.6 -1.8 -1.3 -1.8 2.2 1 2.5 0.8 -0.9 B -2.3 -0.7 -1.9 -1.2 2.6 1 1.4 1 2.1 0.4 Notes: 1. Cnw and Cm denote net pressures (contributions from top and bottom surfaces) for windward and leeward half of mof surfaces, respectively. 2. Clear wind flow denotes relatively unobstructed wind flaw with blockage less than or equal to 50%. Obstructed wind flow denotes objects below mof inhibiting wind flow (>50%blockage). 3. For values of 0 between 7.5° and 45°, linear interpolation is perodued. For values of 0 less than 7.5°, use load coefficients for 0°. 4. Plus and minus signs signify pressures acting towards and away from the top roofsurface, respectively. 5. All lead cases shown for each roof angle shall be investigated. 6. Notation: L : herizantal dimension of roof, measured in the along wind direction, ft. (m) h : mean roofheight, ft. (m) y : direction of wind, degrees 0 : angle of plane ofroof from horizontal, degrees 267 DocuSign Envelope ID: 98043D48-BO2A-4A74-BB55-ADOFIAADBOl C Main Wind Force Resisting System -Part 1 Figure 27.4-4 1 Net Pressure Coefficien Open Buildings L 0.5 L 0 CNW1 Wind Cm. Direction h00 0 MINIMUM DESIGN LOADS Monoslope Free Roofs 0 S 45°, Y = 0°,1800 Wind Direction Y o0 Roof Angle 0 Load Case Wind Direction, Y= On Wind Direction, = 180e Clear Wind Flow Obstructed Wind Flow Clear Wind Flow Obstructed Wind Flow CNw CNL CNw CNL CNw CNL CNw CNL On A 1.2 0.3 -0.5 -1.2 1.2 0.3 -0.5 -1.2 B -1.1 -0.1 -1.1 -0.6 -1.1 -0.1 -1.1 -0.6 7.50 A -0.6 -1 -1 -1.5 0.9 1.5 -0.2 -1.2 B -1.4 0 -1.7 -0.8 1.6 0.3 0.8 -0.3 150 A -0.9 -1.3 -1.1 -1.5 1.3 1.6 0.4 -1.1 B -1.9 0 -2.1 -0.6 1.8 0.6 1.2 -0.3 22.50 A -1.5 -1.6 -1.5 -1.7 1.7 1.8 0.5 -1 B -2.4 -0.3 -2.3 -0.9 2.2 0.7 1.3 0 300 A -1.8 -1.8 -1.5 -1.8 2.1 2.1 0.6 -1 B -2.5 -0.5 -2.3 -1.1 2.6 1 1.6 0.1 37.50 A -1.8 -1.8 -1.5 -1.8 2.1 2.2 0.7 -0.9 B -2.4 -0.6 -2.2 -1.1 2.7 1.1 1.9 0.3 450 A . -1.6 -1.8 1 -1.3 -1.8 2.2 2.5 0.8 -0.9 B -2.3 1 -0.7 1 -1.9 -1.2 2.6 1.4 2.1 0.4 Notes: L CN and Cm, denote act pressures (contributions from top and bottom surfaces) for windward and leeward half of mofsurfaces, respectively. 2. Clear wind flow denotes relatively unobstructed wind now with blockage less than or equal to 50%. Obstructed wind flaw denotes objects below mof inhibiting wind flow (>50%blockage). 3. For values of 0 between 7.5° and 45°, linear interpolation is permitted. For values of 0 less than 7.5°, use load coefficients for 0°. 4. Plus and minus signs signify pressures acting towards and away from the top mof surface, respectively. 5. All load cues shown for each roofangle shall be investigated. 6. Notation: L : borizonml dimension ofroof, measured in the along wind direction, it (m) h : mean roof height, R (m) y direction of wind, degrees 0 : angle ofplme ofroof from horizontal, degrees MA