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HomeMy WebLinkAboutWind Load Calculation% DocuSign Envelope ID: 98043D48-BO2A-4A74-BB55-ADOFIAADBDI C FL Design Build Inspect CRC1331263 I AA260031421 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, Er, ocuSiOned by: aIn �C�tt, ct r 35FAF3GE92488... 4/20/2020 Frank Liebler Owner / Architect / Contractor FL Design Build Inspect Construction + Architecture + Home Inspection CRC1331263 I AA26003142 I H110776 frank.liebler@gmail.com c 772.321.4500 REVIEWED FOR CODE COMPLIANCE ST. LUCIE COUNTY BOCC BLDG DEPT CORRESPONDENCE 11 of 1 DocuSign Envelope ID: 98043048-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 Kzt= 1.00 Kd = 0.85 G = 0.85 Kz qh FT 0.849 38.84 UB = 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 r ASCE 7-10 Fig. 26.8-1 ASCE 7-10 Fig. 26.6-1 ASCE 7-10 Sec. 26.9.1 9.46 DEG ❑= 9.5 2g = 900 q z=.00256KzKztKdV 2 L = Span of Pitched Rod B = Length of Building P=ghGCN Note: Pressures are limit state design pressures for strength design. Multiple by 0.6 for ASD. (Wnd direction perpendicular to doge.) Design Pressure (psf) h (ft). qh (pso CNW CNL ghGCNW ghGCNL Load Case Ai Clear Wind Flow 9.50 38.84 1.100 -0.326 36.31 -10.77 Load Case B: Clear Wind Flow 9.50 38.84 0.174 -1.174 5.74 -38.75 Load Case A: Obstructed Wind Flow 9.50 38.84 -1.495 -1.000 -49.36 33.01 Load Case B: Obstructed Wind Flow 9.50 38.84 -0.822 -1,674 -27 12 -' _ 55.261 Longitudinal Direction:- „Note: Pressures are limit state design pressures for strength design.. Multiple by 06 for ASD. (Wind direction parallel to doll Design Pressure (psf) Distance (ft) qh (psf) 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 (>2h) 38.84 -0.30 -9.90 Load Case B: 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 Wind 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 Wind 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 M WFRS Calculator- Open Building Rev. 1.0.0 - 8r8/2016 Copyright 02016 - Medeek Engineering Inc. 'is; DocuSign Envelope ID: 98043D48-802A4A74-BB55-ADOFIAADBDIC 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 Esp. Category Velocity Pressures Height (ft) h = 8.75 L= 20 B= 14 Design Pressures Transverse Direction: Analytic Directional Procedure 145.00 MPH K;d 1.00 Kid = 0.85 G = 0.85 Kz qh FT 0.849 38.84 UB= 1.43 h/L = 0.44 3.00 :12 8.000 FT 9.500 FT 8.750 FT C Pat Job#: ASCE 7-10 Fig. 27.4-5. 27.4-7 ASCE 7-10 Fig. 26.6-1 ASCE 7-10 Fig. 26.6.1 ASCE 7-10 Sec. 26.9.1 14.04 DEG a = 9.5 zg = 900 qz=.00256KzKztKdV2 L = span of Pitched Roof B = Length of Building P = qh GCN Note: Pressures are limit state design pressures for strength design Multiple by 0.6 for Aso. (Wnd direction perpendicular to ridge.) Design Pressure (psf) h (ft) qh (PSO 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 Wind 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 stri design. Multiple by 0.6 for ASD. lived direction parallel to ridge.) ' Design Pressure (psf) Distance (it) qh (psf) CN ghGCN Load Case A: Clear Wind Flow (0 to h/2) 38.84 -0.80 -26.41 (h to 2h) 38.84 -0.50 -19.81 (>2h) 38.84 -0.30 -9.90 Load Case B: 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 Wind 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 MVVFRS Calculator- Open Building Rev. 1.0.0 -WWO16 Copynght 0 2016 - Medeek Engineering Inc DocuSign Envelope ID: 98043D48-BO2A4A74-BB55-ADOFIAADBDIC PORCH @ POLE BARN WIND (MWFRS - Open Building) Wind Analysis Method Basic Wind Speed (ultimate) Topography Factor Directionality Factor Gust Effect Factor Roof Pilch 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 Kzt= 1.00 Kd = 0.85 G = 0.85 Kz qh FT 0.849 38.84 LIB = 0.29 h/L = 0.76 2.00 :12 8.000 FT 9.000 FT 8.000 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 Sea 26.9.1 9.46 DEG a= 9.5 2g = 900 qz=.00256Kz KztKd V2 L= Span of Pitched Roof B = Length W Building p=qh GCN Note: Pressures are limit state design pressures for strength design. Multiple by 0.6 for Aso. (Wind direction perpendicular to ridge.) Design Pressure (psf) h (ft) qh (PSO CNW CNL ghGCNw 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 Wind Flow 8.00 38.84 -1.495 -1.000 -49.36 33.01) Load Case 8: Obstructed Wind Flow 8.00 38.84 -0.822 -1.674 -27.12 -55.26 Longitudinal Direction: Note: Pressures are limit stare design pressures for strength design. Multiple by 0.6 for ASO, (Wind direction parallel to ridge.) Design Pressure (psf) Distance (ft) qh (psf) 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 (>2h) 38.84 -0.30 -9.90 Load Case 6: Clear Wind Flow (0 to h/2) 38.84 0.80 26.41 (h to 2h) 38.84 0.50 16.51 (>21h) 38.84 0.30 9.90 Load Case A: Obstructed Wind Flow (0 to h/2) 38.84 -1.20 -39.61 (h to 2h) 38.84 -0.90 -29.71 (>21h) 38.84 -0.60 -19.81 Load Case B: Obstructed Wind Flow (0 to h/2) 38.84 0.50 16.51 (h to 2h) 38.94 0.50 16.51 (>21h) 38.84 0.30 9.90 MWFRS Calculator- Open Building Rev. 1.0.0 - Wa2016 Copyright ® 2016 - Medeek Engineering Inc. DocuSign Envelope ID: 98043D48-BO2A-4A74-BB55-ADOFIAADBDIC Main Wind Force Resisting System -Part 1 Figure 27.4-4 1 Net Pressure Coefficien Open Buildings L 0.5 L + 0.5 L Cm Wind CNL Direction �Ij' 0 h 0 r= o° I55t@II5111S8N2.9cc] JIMIA y 0.255 LH.51.0 Monoslope Free Roofs 05 450. Y = 00.1800 Wind Direction y = 180° Roof Angle 0 Load Case Wind Direction, y= 0° Wind Direction, y= 180° Clear Wind Flow Obstructed Wind Flow Clear Wind Flow Obstructed Wind Flow CNw CNL CNw CNL CNw CNL CNW CNL p° 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 49 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 -1.3 -1.8 2.2 2.5 0.8 -0.9 B -2.3 -0.7 -1.9 -1.2 2.6 1.4 2.1 0.4 Notes: 1. Cn and Cs' denote net pressures (contributions from top and bottom surfaces) for windward and leeward half of mof surfaces, respectively. 2. Clear wind now denotes relatively unobstructed wind flow with blockage less than or equal to 50%. Obstructed wind now denotes objects below mof inhibiting wind now (>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 faro°. 4. Plus and minus signs signify pressures acting towards and away from the top mof surface, respectively. 5. All load cases shown for each mof angle shall be investigated. 6. Notation: L : horizontal dimension of roof, measured in the along wind direction, ft (m) h : me. mof height, R (m) 7 : direction of wind, degrees 0 : angle of plane of roof from horizontal, degrees 267 DocuSign Envelope ID: 98043048-BO2A-4A74-BB55-ADOFIAADBDIC MINIMUM DESIGN LOADS Main Wind Force Resisting System - Part 1 1 0.25 5 l✓L 5 1.0 Figure 27.44 1 Net Pressure Coefficient, CN Monoslope Free Roofs Open Buildings 0 5 45°, ^(_ 00, 1800 L L 0.f , L ► 0i 5L ►. , g1 CNW 4� CNL Wind Direction rh7=00 [: CNL Wind Direction y =180' Roof Angle 0 Load Case Wind Direction, y= On Wind Direction, 7 = 1800 Clear Wind Flow Obstructed Wind Flow Clear Wind Flow Obstructed Wind Flow CNW CM, CNW CM, CNw CNL CNW CM, 0. 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 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 -1.3 -1.8 2.2 2.5 0.8 -0.9 B -2.3 1 -0.7 1 -1.9 -1.2 2.6 1 1. 1 2.1 0.4 Notes: L C� and Cm, denote net pressures (contributions from top and bottom surfaces) for windward and leeward half of mofsurfaces, respectively. 2. Clear wind flow denotes relatively unobstructed wind flow with blockage less than or equal to 50%. Obstructed wind flow denotes objects below roof 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 7Y, use load coefficients for 0°. 4. Plus and minus signs signify pressures acting towards and away from the top roufsurface, respectively. S. All load cases shown for each roof angle shall be investigated. 6. Notation: L : horizontal dimension ofroof, measured in We along wind direction, R (m) h :mean maf height, f . (m) 7 : direction of wind, degrees 0 : angle ofpl me ofmof from horizontal, degrees 267