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MecaWind v2318 Software Developer: Meca Enterprises Inc., www.meca.biz, Copyright © 2018 Calculations Prepared by: Date: Feb 10, 2021 Project #: Port Designer: Percy Malpartida Location: Port st luci FileLocation : Basic Wind Parameters Wind Load Standard = ASCE 710 Exposure Category = D Wind Design Speed = 175.0 mph Risk Category = III Structure Type = Building Building Type = Enclosed General Wind Settings = ASCE 710 Wind Parameters = Incl_LF = Include ASD Load Factor of 0.6 in Pressures = True DynType = Dynamic Type of Structure = Rigid NF = Natural Frequency of Structure (Mode 1) = 1.000 Hz NF = Natural Frequency of Structure = 1.000 Hz Zg = Altitude (Ground Elevation) above Sea Level = 0.000 ft Bdist = Base Elevation of Structure = 0.000 ft GenElev = Specify the Elevations For Wind Pressures = Mean Roof Ht SDB = Simple Diaphragm Building = False MWFRS = Analysis Procedure being used for MWFRS = Ch 27 Pt 1 C&C = Analysis Procedure being used for C&C = Ch 30 Pt 1 MWFRSType = MWFRS Method Selected = Ch 27 Pt 1 Topographic Factor per Fig 26.81 Topo = Topographic Feature = None Kzt = Topographic Factor = 1.000 Building Inputs RoofType: Building Roof Type = MultiGabled : MultiGabled = W : Width Perp to Ridge = 11.000 ft L : Length Along Ridge = 21.000 ft EHt : Eave Height = 12.000 ft RE : Roof Entry Method = Slope Slope : Slope of Roof = 3.0 :12 Parapet : Type of Parapet = None Theta : Roof Slope = 14.04 Deg Par : Is there a Parapet = False OH_ALL : None = 0.000 ft OH_ALL : None = 0.000 ft OH_ALL : None = 0.000 ft Exposure Constants per Table 26.91: Alpha: Const from Table 26.91= 11.500 Zg: Const from Table 26.91= 700.000 ft At: Const from Table 26.91= 0.087 Bt: Const from Table 26.91= 1.070 Am: Const from Table 26.91= 0.111 Bm: Const from Table 26.91= 0.800 C: Const from Table 26.91= 0.150 Eps: Const from Table 26.91= 0.125 Overhang Inputs: Std = Overhangs on all sides are the same = True OHType = Type of Roof Wall Intersections = None Main Wind Force Resisting System (MWFRS) Calculations per Ch 27 Part 1: EHt = Eave Height = 12.000 ft RHt = Ridge Height = 13.375 ft h = Mean Roof Height: 0.5*(EHt+RHt) = 12.688 ft Zh = Mean Roof Height for Kh: h + Base_Dist = 12.688 ft Kh = Since Zh<15 ft [4.572 m] > 2.01 * (15/zg)^(2/Alpha) = 1.030 Kzt = Topographic Factor is 1 since no Topographic feature specified = 1.000 Kd = Wind Directionality Factor per Table 26.61 = 0.85 GCPi = Ref Table 26.111 for Enclosed Building = +/0.18 RA = Roof Area = 238.11 sq ft LF = Load Factor based upon ASD Design = 0.60 qh = (0.00256 * Kh * Kzt * Kd * V^2) * LF = 41.19 psf qin = For Negative Internal Pressure of Enclosed Building use qh*LF = 41.19 psf qip = For Positive Internal Pressure of Enclosed Building use qh*LF = 41.19 psf Gust Factor Calculation: Gust Factor Category I Rigid Structures Simplified Method G1 = For Rigid Structures (Nat. Freq.>1 Hz) use 0.85 = 0.85 Gust Factor Category II Rigid Structures Complete Analysis Zm = 0.6 * Ht = 7.613 ft Izm = Cc * (33 / Zm) ^ 0.167 = 0.192 Lzm = L * (Zm / 33) ^ Epsilon = 541.116 Q = (1 / (1 + 0.63 * ((B + Ht) / Lzm)^0.63))^0.5 = 0.959 G2 = 0.925*((1+1.7*lzm*3.4*Q)/(1+1.7*3.4*lzm)) = 0.905 Gust Factor Used in Analysis G = Lessor Of G1 Or G2 = 0.850 MWFRS Wind Normal to Ridge (Ref Fig 27.41} h = Mean Roof Height Of Building = 12.688 ft RHt = Ridge Height Of Roof = 13.375 ft B = Horizontal Dimension Of Building Normal To Wind Direction = 21.000 ft L = Horizontal Dimension Of building Parallel To Wind Direction = 11.000 ft L/B = Ratio Of L/B used For Cp determination = 0.524 h/L = Ratio Of h/L used For Cp determination = 1.153 Slope = Slope of Roof = 14.04 Deg Roof_LW = Roof Coefficient (Leeward) = 0.62, 0.62 Roof_WW = Roof Coefficient (Windward) = 0.18, 1.06 Cp_WW = Windward Wall Coefficient (All L/B Values) = 0.80 Cp_LW = Leward Wall Coefficient Using L/B = 0.50 Cp_SW = Side Wall Coefficient (All L/B values) = 0.70 GCpn_WW = Parapet Combined Net Pressure Coefficient (Windward Parapet) = 1.50 GCpn_LW = Parapet Combined Net Pressure Coefficient (Leeward Parapet) = 1.00 Wall Wind Pressures based On Positive Internal Pressure (+GCPi) Normal to Ridge All wind pressures include a load factor of 0.6 Elev Kz Kzt qz GCPi Windward Leeward Side Total Minimum Press Press Press Press Pressure* ft psf psf psf psf psf psf psf 12.00 1.030 1.000 41.19 0.18 20.60 24.92 31.92 45.52 9.60 Wall Wind Pressures based on Negative Internal Pressure (GCPi) Normal to Ridge All wind pressures include a load factor of 0.6 Elev Kz Kzt qz GCPi Windward Leeward Side Total Minimum Press Press Press Press Pressure* ft psf psf psf psf psf psf psf 12.00 1.030 1.000 41.19 0.18 35.43 10.09 17.09 45.52 9.60 Notes Wall Pressures: Kz = Velocity Press Exp Coeff Kzt = Topographical Factor qz = 0.00256*Kz*Kzt*Kd*V^2 GCPi = Internal Press Coefficient Side = qh * G * Cp_SW qip * +GCPi Windward = qz * G * Cp_WW qip * +GCPi Leeward = qh * G * Cp_LW qip * +GCPi Total = Windward Press Leeward Press * Minimum Pressure: Para 27.4.7 no less than 9.60 psf (Incl LF) applied to Walls + Pressures Acting TOWARD Surface Pressures Acting AWAY from Surface Roof Wind Pressures for Positive & Negative Internal Pressure (+/ GCPi) Normal to Ridge All wind pressures include a load factor of 0.6 Roof Var Start End Cp_min Cp_max GCPi Pressure Pressure Pressure Pressure Dist Dist Pn_min* Pp_min* Pn_max Pp_max ft ft psf psf psf psf Roof_LW N/A N/A 0.620 0.620 0.180 14.29 29.12 14.29 29.12 Roof_WW N/A N/A 0.180 1.060 0.180 1.11 13.72 29.70 44.53 Notes Roof Pressures: Start Dist = Start Dist from Windward Edge End Dist = End Dist from Windward Edge Cp_Max = Largest Coefficient Magnitude Cp_Min = Smallest Coefficient Magnitude Pp_max = qh*G*Cp_max qip*(+GCPi) Pn_max = qh*G*Cp_max qin*(GCpi) Pp_min* = qh*G*Cp_min qip*(+GCPi) Pn_min* = qh*G*Cp_min qin*(GCPi) OH = Overhang X = Dir along Ridge Y = Dir Perpendcular to Ridge Z = Vertical * The smaller uplift pressures due to Cp_Min can become critical when wind is combined with roof live load or snow load; load combinations are given in ASCE 7 + Pressures Acting TOWARD Surface Pressures Acting AWAY from Surface MWFRS Wind Parallel to Ridge (Ref Fig 27.41} h = Mean Roof Height Of Building = 12.688 ft RHt = Ridge Height Of Roof = 13.375 ft B = Horizontal Dimension Of Building Normal To Wind Direction = 11.000 ft L = Horizontal Dimension Of building Parallel To Wind Direction = 21.000 ft L/B = Ratio Of L/B used For Cp determination = 1.909 h/L = Ratio Of h/L used For Cp determination = 0.604 Slope = Slope of Roof = 14.04 Deg Roof = **Roof Coeff (0 to h/2) (0.000 ft to 6.344 ft) = 0.18, 0.958 Roof_1 = Roof Coeff (h/2 to h) (6.344 ft to 12.688 ft) = 0.18, 0.858 Roof_2 = Roof Coeff (h to 2h) (12.688 ft to 25.375 ft) = 0.18, 0.542 **Includes Reduction Factor 0.91 For roof area, applied To Cp=1.3 For h/L>=1 & (0 To h/2) Cp_WW = Windward Wall Coefficient (All L/B Values) = 0.80 Cp_LW = Leward Wall Coefficient Using L/B = 0.32 Cp_SW = Side Wall Coefficient (All L/B values) = 0.70 GCpn_WW = Parapet Combined Net Pressure Coefficient (Windward Parapet) = 1.50 GCpn_LW = Parapet Combined Net Pressure Coefficient (Leeward Parapet) = 1.00 Wall Wind Pressures based On Positive Internal Pressure (+GCPi) Parallel to Ridge All wind pressures include a load factor of 0.6 Elev Kz Kzt qz GCPi Windward Leeward Side Total Minimum Press Press Press Press Pressure* ft psf psf psf psf psf psf psf 13.38 1.030 1.000 41.19 0.18 20.60 18.56 31.92 39.15 9.60 12.69 1.030 1.000 41.19 0.18 20.60 18.56 31.92 39.15 9.60 12.00 1.030 1.000 41.19 0.18 20.60 18.56 31.92 39.15 9.60 Wall Wind Pressures based on Negative Internal Pressure (GCPi) Parallel to Ridge All wind pressures include a load factor of 0.6 Elev Kz Kzt qz GCPi Windward Leeward Side Total Minimum Press Press Press Press Pressure* ft psf psf psf psf psf psf psf 13.38 1.030 1.000 41.19 0.18 35.43 3.73 17.09 39.15 9.60 12.69 1.030 1.000 41.19 0.18 35.43 3.73 17.09 39.15 9.60 12.00 1.030 1.000 41.19 0.18 35.43 3.73 17.09 39.15 9.60 Notes Wall Pressures: Kz = Velocity Press Exp Coeff Kzt = Topographical Factor qz = 0.00256*Kz*Kzt*Kd*V^2 GCPi = Internal Press Coefficient Side = qh * G * Cp_SW qip * +GCPi Windward = qz * G * Cp_WW qip * +GCPi Leeward = qh * G * Cp_LW qip * +GCPi Total = Windward Press Leeward Press * Minimum Pressure: Para 27.4.7 no less than 9.60 psf (Incl LF) applied to Walls + Pressures Acting TOWARD Surface Pressures Acting AWAY from Surface Roof Wind Pressures for Positive & Negative Internal Pressure (+/ GCPi) Parallel to Ridge All wind pressures include a load factor of 0.6 Roof Var Start End Cp_min Cp_max GCPi Pressure Pressure Pressure Pressure Dist Dist Pn_min* Pp_min* Pn_max Pp_max ft ft psf psf psf psf Roof (+Y) 0.000 6.344 0.180 0.958 0.180 1.11 13.72 26.14 40.97 Roof_1 (+Y) 6.344 12.688 0.180 0.858 0.180 1.11 13.72 22.64 37.47 Roof_2 (+Y) 12.688 25.375 0.180 0.542 0.180 1.11 13.72 11.55 26.38 Notes Roof Pressures: Start Dist = Start Dist from Windward Edge End Dist = End Dist from Windward Edge Cp_Max = Largest Coefficient Magnitude Cp_Min = Smallest Coefficient Magnitude Pp_max = qh*G*Cp_max qip*(+GCPi) Pn_max = qh*G*Cp_max qin*(GCpi) Pp_min* = qh*G*Cp_min qip*(+GCPi) Pn_min* = qh*G*Cp_min qin*(GCPi) OH = Overhang X = Dir along Ridge Y = Dir Perpendcular to Ridge Z = Vertical * The smaller uplift pressures due to Cp_Min can become critical when wind is combined with roof live load or snow load; load combinations are given in ASCE 7 + Pressures Acting TOWARD Surface Pressures Acting AWAY from Surface Components And Cladding (C&C) Calculations per Ch 30 Part 1: EHt = Eave Height = 12.000 ft RHt = Ridge Height = 13.375 ft h = Mean Roof Height: 0.5*(EHt+RHt) = 12.688 ft Zh = Mean Roof Height for Kh: h + Base_Dist = 12.688 ft Kh = Since Zh<15 ft [4.572 m] > 2.01 * ( [15 ft or 4.572 m] / zg)^(2/Alpha)= 1.030 Kzt = Topographic Factor is 1 since no Topographic feature specified = 1.000 Kd = Wind Directionality Factor per Table 26.61 = 0.85 GCPi = Ref Table 26.111 for Enclosed Building = +/0.18 LF = Load Factor based upon ASD Design = 0.60 qh = (0.00256 * Kh * Kzt * Kd * V^2) * LF = 41.19 psf LHD = Least Horizontal Dimension: Min(B, L) = 11.000 ft a1 = Min(0.1 * LHD, 0.4 * h = 1.100 ft a = Max(a1, 0.04 * LHD, 3 ft [0.9 m]) = 3.000 ft Wind Pressures for C&C Ch 30 Pt 1 All wind pressures include a load factor of 0.6 Description Zone Width Span Area 1/3 Ref GCp GCp p p Rule Fig Max Min Max Min ft ft ft sq ft psf psf D1 4 3.000 6.800 20.40 No 30.41 0.945 1.045 46.36 50.47 D2 4 3.000 6.800 20.40 No 30.41 0.945 1.045 46.36 50.47 Area = Span Length x Effective Width 1/3 Rule = Effective width need not be less than 1/3 of the span length GCp = External Pressure Coefficients taken from Figures 30.41 through 30.47 p = Wind Pressure: qh*(GCp GCpi) [Eqn 30.41]* *Per Para 30.2.2 the Minimum Pressure for C&C is 9.60 psf [0.460 kPa] {Includes LF} MecaWind v2318 Software Developer: Meca Enterprises Inc., www.meca.biz, Copyright © 2018 Calculations Prepared by: Date: Feb 10, 2021 Project #: Port Designer: Percy Malpartida Location: Port st luci FileLocation : Basic Wind Parameters Wind Load Standard = ASCE 710 Exposure Category = D Wind Design Speed = 175.0 mph Risk Category = III Structure Type = Building Building Type = Enclosed General Wind Settings = ASCE 710 Wind Parameters = Incl_LF = Include ASD Load Factor of 0.6 in Pressures = True DynType = Dynamic Type of Structure = Rigid NF = Natural Frequency of Structure (Mode 1) = 1.000 Hz NF = Natural Frequency of Structure = 1.000 Hz Zg = Altitude (Ground Elevation) above Sea Level = 0.000 ft Bdist = Base Elevation of Structure = 0.000 ft GenElev = Specify the Elevations For Wind Pressures = Mean Roof Ht SDB = Simple Diaphragm Building = False MWFRS = Analysis Procedure being used for MWFRS = Ch 27 Pt 1 C&C = Analysis Procedure being used for C&C = Ch 30 Pt 1 MWFRSType = MWFRS Method Selected = Ch 27 Pt 1 Topographic Factor per Fig 26.81 Topo = Topographic Feature = None Kzt = Topographic Factor = 1.000 Building Inputs RoofType: Building Roof Type = MultiGabled : MultiGabled = W : Width Perp to Ridge = 11.000 ft L : Length Along Ridge = 21.000 ft EHt : Eave Height = 12.000 ft RE : Roof Entry Method = Slope Slope : Slope of Roof = 3.0 :12 Parapet : Type of Parapet = None Theta : Roof Slope = 14.04 Deg Par : Is there a Parapet = False OH_ALL : None = 0.000 ft OH_ALL : None = 0.000 ft OH_ALL : None = 0.000 ft Exposure Constants per Table 26.91: Alpha: Const from Table 26.91= 11.500 Zg: Const from Table 26.91= 700.000 ft At: Const from Table 26.91= 0.087 Bt: Const from Table 26.91= 1.070 Am: Const from Table 26.91= 0.111 Bm: Const from Table 26.91= 0.800 C: Const from Table 26.91= 0.150 Eps: Const from Table 26.91= 0.125 Overhang Inputs: Std = Overhangs on all sides are the same = True OHType = Type of Roof Wall Intersections = None Main Wind Force Resisting System (MWFRS) Calculations per Ch 27 Part 1: EHt = Eave Height = 12.000 ft RHt = Ridge Height = 13.375 ft h = Mean Roof Height: 0.5*(EHt+RHt) = 12.688 ft Zh = Mean Roof Height for Kh: h + Base_Dist = 12.688 ft Kh = Since Zh<15 ft [4.572 m] > 2.01 * (15/zg)^(2/Alpha) = 1.030 Kzt = Topographic Factor is 1 since no Topographic feature specified = 1.000 Kd = Wind Directionality Factor per Table 26.61 = 0.85 GCPi = Ref Table 26.111 for Enclosed Building = +/0.18 RA = Roof Area = 238.11 sq ft LF = Load Factor based upon ASD Design = 0.60 qh = (0.00256 * Kh * Kzt * Kd * V^2) * LF = 41.19 psf qin = For Negative Internal Pressure of Enclosed Building use qh*LF = 41.19 psf qip = For Positive Internal Pressure of Enclosed Building use qh*LF = 41.19 psf Gust Factor Calculation: Gust Factor Category I Rigid Structures Simplified Method G1 = For Rigid Structures (Nat. Freq.>1 Hz) use 0.85 = 0.85 Gust Factor Category II Rigid Structures Complete Analysis Zm = 0.6 * Ht = 7.613 ft Izm = Cc * (33 / Zm) ^ 0.167 = 0.192 Lzm = L * (Zm / 33) ^ Epsilon = 541.116 Q = (1 / (1 + 0.63 * ((B + Ht) / Lzm)^0.63))^0.5 = 0.959 G2 = 0.925*((1+1.7*lzm*3.4*Q)/(1+1.7*3.4*lzm)) = 0.905 Gust Factor Used in Analysis G = Lessor Of G1 Or G2 = 0.850 MWFRS Wind Normal to Ridge (Ref Fig 27.41} h = Mean Roof Height Of Building = 12.688 ft RHt = Ridge Height Of Roof = 13.375 ft B = Horizontal Dimension Of Building Normal To Wind Direction = 21.000 ft L = Horizontal Dimension Of building Parallel To Wind Direction = 11.000 ft L/B = Ratio Of L/B used For Cp determination = 0.524 h/L = Ratio Of h/L used For Cp determination = 1.153 Slope = Slope of Roof = 14.04 Deg Roof_LW = Roof Coefficient (Leeward) = 0.62, 0.62 Roof_WW = Roof Coefficient (Windward) = 0.18, 1.06 Cp_WW = Windward Wall Coefficient (All L/B Values) = 0.80 Cp_LW = Leward Wall Coefficient Using L/B = 0.50 Cp_SW = Side Wall Coefficient (All L/B values) = 0.70 GCpn_WW = Parapet Combined Net Pressure Coefficient (Windward Parapet) = 1.50 GCpn_LW = Parapet Combined Net Pressure Coefficient (Leeward Parapet) = 1.00 Wall Wind Pressures based On Positive Internal Pressure (+GCPi) Normal to Ridge All wind pressures include a load factor of 0.6 Elev Kz Kzt qz GCPi Windward Leeward Side Total Minimum Press Press Press Press Pressure* ft psf psf psf psf psf psf psf 12.00 1.030 1.000 41.19 0.18 20.60 24.92 31.92 45.52 9.60 Wall Wind Pressures based on Negative Internal Pressure (GCPi) Normal to Ridge All wind pressures include a load factor of 0.6 Elev Kz Kzt qz GCPi Windward Leeward Side Total Minimum Press Press Press Press Pressure* ft psf psf psf psf psf psf psf 12.00 1.030 1.000 41.19 0.18 35.43 10.09 17.09 45.52 9.60 Notes Wall Pressures: Kz = Velocity Press Exp Coeff Kzt = Topographical Factor qz = 0.00256*Kz*Kzt*Kd*V^2 GCPi = Internal Press Coefficient Side = qh * G * Cp_SW qip * +GCPi Windward = qz * G * Cp_WW qip * +GCPi Leeward = qh * G * Cp_LW qip * +GCPi Total = Windward Press Leeward Press * Minimum Pressure: Para 27.4.7 no less than 9.60 psf (Incl LF) applied to Walls + Pressures Acting TOWARD Surface Pressures Acting AWAY from Surface Roof Wind Pressures for Positive & Negative Internal Pressure (+/ GCPi) Normal to Ridge All wind pressures include a load factor of 0.6 Roof Var Start End Cp_min Cp_max GCPi Pressure Pressure Pressure Pressure Dist Dist Pn_min* Pp_min* Pn_max Pp_max ft ft psf psf psf psf Roof_LW N/A N/A 0.620 0.620 0.180 14.29 29.12 14.29 29.12 Roof_WW N/A N/A 0.180 1.060 0.180 1.11 13.72 29.70 44.53 Notes Roof Pressures: Start Dist = Start Dist from Windward Edge End Dist = End Dist from Windward Edge Cp_Max = Largest Coefficient Magnitude Cp_Min = Smallest Coefficient Magnitude Pp_max = qh*G*Cp_max qip*(+GCPi) Pn_max = qh*G*Cp_max qin*(GCpi) Pp_min* = qh*G*Cp_min qip*(+GCPi) Pn_min* = qh*G*Cp_min qin*(GCPi) OH = Overhang X = Dir along Ridge Y = Dir Perpendcular to Ridge Z = Vertical * The smaller uplift pressures due to Cp_Min can become critical when wind is combined with roof live load or snow load; load combinations are given in ASCE 7 + Pressures Acting TOWARD Surface Pressures Acting AWAY from Surface MWFRS Wind Parallel to Ridge (Ref Fig 27.41} h = Mean Roof Height Of Building = 12.688 ft RHt = Ridge Height Of Roof = 13.375 ft B = Horizontal Dimension Of Building Normal To Wind Direction = 11.000 ft L = Horizontal Dimension Of building Parallel To Wind Direction = 21.000 ft L/B = Ratio Of L/B used For Cp determination = 1.909 h/L = Ratio Of h/L used For Cp determination = 0.604 Slope = Slope of Roof = 14.04 Deg Roof = **Roof Coeff (0 to h/2) (0.000 ft to 6.344 ft) = 0.18, 0.958 Roof_1 = Roof Coeff (h/2 to h) (6.344 ft to 12.688 ft) = 0.18, 0.858 Roof_2 = Roof Coeff (h to 2h) (12.688 ft to 25.375 ft) = 0.18, 0.542 **Includes Reduction Factor 0.91 For roof area, applied To Cp=1.3 For h/L>=1 & (0 To h/2) Cp_WW = Windward Wall Coefficient (All L/B Values) = 0.80 Cp_LW = Leward Wall Coefficient Using L/B = 0.32 Cp_SW = Side Wall Coefficient (All L/B values) = 0.70 GCpn_WW = Parapet Combined Net Pressure Coefficient (Windward Parapet) = 1.50 GCpn_LW = Parapet Combined Net Pressure Coefficient (Leeward Parapet) = 1.00 Wall Wind Pressures based On Positive Internal Pressure (+GCPi) Parallel to Ridge All wind pressures include a load factor of 0.6 Elev Kz Kzt qz GCPi Windward Leeward Side Total Minimum Press Press Press Press Pressure* ft psf psf psf psf psf psf psf 13.38 1.030 1.000 41.19 0.18 20.60 18.56 31.92 39.15 9.60 12.69 1.030 1.000 41.19 0.18 20.60 18.56 31.92 39.15 9.60 12.00 1.030 1.000 41.19 0.18 20.60 18.56 31.92 39.15 9.60 Wall Wind Pressures based on Negative Internal Pressure (GCPi) Parallel to Ridge All wind pressures include a load factor of 0.6 Elev Kz Kzt qz GCPi Windward Leeward Side Total Minimum Press Press Press Press Pressure* ft psf psf psf psf psf psf psf 13.38 1.030 1.000 41.19 0.18 35.43 3.73 17.09 39.15 9.60 12.69 1.030 1.000 41.19 0.18 35.43 3.73 17.09 39.15 9.60 12.00 1.030 1.000 41.19 0.18 35.43 3.73 17.09 39.15 9.60 Notes Wall Pressures: Kz = Velocity Press Exp Coeff Kzt = Topographical Factor qz = 0.00256*Kz*Kzt*Kd*V^2 GCPi = Internal Press Coefficient Side = qh * G * Cp_SW qip * +GCPi Windward = qz * G * Cp_WW qip * +GCPi Leeward = qh * G * Cp_LW qip * +GCPi Total = Windward Press Leeward Press * Minimum Pressure: Para 27.4.7 no less than 9.60 psf (Incl LF) applied to Walls + Pressures Acting TOWARD Surface Pressures Acting AWAY from Surface Roof Wind Pressures for Positive & Negative Internal Pressure (+/ GCPi) Parallel to Ridge All wind pressures include a load factor of 0.6 Roof Var Start End Cp_min Cp_max GCPi Pressure Pressure Pressure Pressure Dist Dist Pn_min* Pp_min* Pn_max Pp_max ft ft psf psf psf psf Roof (+Y) 0.000 6.344 0.180 0.958 0.180 1.11 13.72 26.14 40.97 Roof_1 (+Y) 6.344 12.688 0.180 0.858 0.180 1.11 13.72 22.64 37.47 Roof_2 (+Y) 12.688 25.375 0.180 0.542 0.180 1.11 13.72 11.55 26.38 Notes Roof Pressures: Start Dist = Start Dist from Windward Edge End Dist = End Dist from Windward Edge Cp_Max = Largest Coefficient Magnitude Cp_Min = Smallest Coefficient Magnitude Pp_max = qh*G*Cp_max qip*(+GCPi) Pn_max = qh*G*Cp_max qin*(GCpi) Pp_min* = qh*G*Cp_min qip*(+GCPi) Pn_min* = qh*G*Cp_min qin*(GCPi) OH = Overhang X = Dir along Ridge Y = Dir Perpendcular to Ridge Z = Vertical * The smaller uplift pressures due to Cp_Min can become critical when wind is combined with roof live load or snow load; load combinations are given in ASCE 7 + Pressures Acting TOWARD Surface Pressures Acting AWAY from Surface Components And Cladding (C&C) Calculations per Ch 30 Part 1: EHt = Eave Height = 12.000 ft RHt = Ridge Height = 13.375 ft h = Mean Roof Height: 0.5*(EHt+RHt) = 12.688 ft Zh = Mean Roof Height for Kh: h + Base_Dist = 12.688 ft Kh = Since Zh<15 ft [4.572 m] > 2.01 * ( [15 ft or 4.572 m] / zg)^(2/Alpha)= 1.030 Kzt = Topographic Factor is 1 since no Topographic feature specified = 1.000 Kd = Wind Directionality Factor per Table 26.61 = 0.85 GCPi = Ref Table 26.111 for Enclosed Building = +/0.18 LF = Load Factor based upon ASD Design = 0.60 qh = (0.00256 * Kh * Kzt * Kd * V^2) * LF = 41.19 psf LHD = Least Horizontal Dimension: Min(B, L) = 11.000 ft a1 = Min(0.1 * LHD, 0.4 * h = 1.100 ft a = Max(a1, 0.04 * LHD, 3 ft [0.9 m]) = 3.000 ft Wind Pressures for C&C Ch 30 Pt 1 All wind pressures include a load factor of 0.6 Description Zone Width Span Area 1/3 Ref GCp GCp p p Rule Fig Max Min Max Min ft ft ft sq ft psf psf D1 4 3.000 6.800 20.40 No 30.41 0.945 1.045 46.36 50.47 D2 4 3.000 6.800 20.40 No 30.41 0.945 1.045 46.36 50.47 Area = Span Length x Effective Width 1/3 Rule = Effective width need not be less than 1/3 of the span length GCp = External Pressure Coefficients taken from Figures 30.41 through 30.47 p = Wind Pressure: qh*(GCp GCpi) [Eqn 30.41]* *Per Para 30.2.2 the Minimum Pressure for C&C is 9.60 psf [0.460 kPa] {Includes LF} MecaWind v2318 Software Developer: Meca Enterprises Inc., www.meca.biz, Copyright © 2018 Calculations Prepared by: Date: Feb 10, 2021 Project #: Port Designer: Percy Malpartida Location: Port st luci FileLocation : Basic Wind Parameters Wind Load Standard = ASCE 710 Exposure Category = D Wind Design Speed = 175.0 mph Risk Category = III Structure Type = Building Building Type = Enclosed General Wind Settings = ASCE 710 Wind Parameters = Incl_LF = Include ASD Load Factor of 0.6 in Pressures = True DynType = Dynamic Type of Structure = Rigid NF = Natural Frequency of Structure (Mode 1) = 1.000 Hz NF = Natural Frequency of Structure = 1.000 Hz Zg = Altitude (Ground Elevation) above Sea Level = 0.000 ft Bdist = Base Elevation of Structure = 0.000 ft GenElev = Specify the Elevations For Wind Pressures = Mean Roof Ht SDB = Simple Diaphragm Building = False MWFRS = Analysis Procedure being used for MWFRS = Ch 27 Pt 1 C&C = Analysis Procedure being used for C&C = Ch 30 Pt 1 MWFRSType = MWFRS Method Selected = Ch 27 Pt 1 Topographic Factor per Fig 26.81 Topo = Topographic Feature = None Kzt = Topographic Factor = 1.000 Building Inputs RoofType: Building Roof Type = MultiGabled : MultiGabled = W : Width Perp to Ridge = 11.000 ft L : Length Along Ridge = 21.000 ft EHt : Eave Height = 12.000 ft RE : Roof Entry Method = Slope Slope : Slope of Roof = 3.0 :12 Parapet : Type of Parapet = None Theta : Roof Slope = 14.04 Deg Par : Is there a Parapet = False OH_ALL : None = 0.000 ft OH_ALL : None = 0.000 ft OH_ALL : None = 0.000 ft Exposure Constants per Table 26.91: Alpha: Const from Table 26.91= 11.500 Zg: Const from Table 26.91= 700.000 ft At: Const from Table 26.91= 0.087 Bt: Const from Table 26.91= 1.070 Am: Const from Table 26.91= 0.111 Bm: Const from Table 26.91= 0.800 C: Const from Table 26.91= 0.150 Eps: Const from Table 26.91= 0.125 Overhang Inputs: Std = Overhangs on all sides are the same = True OHType = Type of Roof Wall Intersections = None Main Wind Force Resisting System (MWFRS) Calculations per Ch 27 Part 1: EHt = Eave Height = 12.000 ft RHt = Ridge Height = 13.375 ft h = Mean Roof Height: 0.5*(EHt+RHt) = 12.688 ft Zh = Mean Roof Height for Kh: h + Base_Dist = 12.688 ft Kh = Since Zh<15 ft [4.572 m] > 2.01 * (15/zg)^(2/Alpha) = 1.030 Kzt = Topographic Factor is 1 since no Topographic feature specified = 1.000 Kd = Wind Directionality Factor per Table 26.61 = 0.85 GCPi = Ref Table 26.111 for Enclosed Building = +/0.18 RA = Roof Area = 238.11 sq ft LF = Load Factor based upon ASD Design = 0.60 qh = (0.00256 * Kh * Kzt * Kd * V^2) * LF = 41.19 psf qin = For Negative Internal Pressure of Enclosed Building use qh*LF = 41.19 psf qip = For Positive Internal Pressure of Enclosed Building use qh*LF = 41.19 psf Gust Factor Calculation: Gust Factor Category I Rigid Structures Simplified Method G1 = For Rigid Structures (Nat. Freq.>1 Hz) use 0.85 = 0.85 Gust Factor Category II Rigid Structures Complete Analysis Zm = 0.6 * Ht = 7.613 ft Izm = Cc * (33 / Zm) ^ 0.167 = 0.192 Lzm = L * (Zm / 33) ^ Epsilon = 541.116 Q = (1 / (1 + 0.63 * ((B + Ht) / Lzm)^0.63))^0.5 = 0.959 G2 = 0.925*((1+1.7*lzm*3.4*Q)/(1+1.7*3.4*lzm)) = 0.905 Gust Factor Used in Analysis G = Lessor Of G1 Or G2 = 0.850 MWFRS Wind Normal to Ridge (Ref Fig 27.41} h = Mean Roof Height Of Building = 12.688 ft RHt = Ridge Height Of Roof = 13.375 ft B = Horizontal Dimension Of Building Normal To Wind Direction = 21.000 ft L = Horizontal Dimension Of building Parallel To Wind Direction = 11.000 ft L/B = Ratio Of L/B used For Cp determination = 0.524 h/L = Ratio Of h/L used For Cp determination = 1.153 Slope = Slope of Roof = 14.04 Deg Roof_LW = Roof Coefficient (Leeward) = 0.62, 0.62 Roof_WW = Roof Coefficient (Windward) = 0.18, 1.06 Cp_WW = Windward Wall Coefficient (All L/B Values) = 0.80 Cp_LW = Leward Wall Coefficient Using L/B = 0.50 Cp_SW = Side Wall Coefficient (All L/B values) = 0.70 GCpn_WW = Parapet Combined Net Pressure Coefficient (Windward Parapet) = 1.50 GCpn_LW = Parapet Combined Net Pressure Coefficient (Leeward Parapet) = 1.00 Wall Wind Pressures based On Positive Internal Pressure (+GCPi) Normal to Ridge All wind pressures include a load factor of 0.6 Elev Kz Kzt qz GCPi Windward Leeward Side Total Minimum Press Press Press Press Pressure* ft psf psf psf psf psf psf psf 12.00 1.030 1.000 41.19 0.18 20.60 24.92 31.92 45.52 9.60 Wall Wind Pressures based on Negative Internal Pressure (GCPi) Normal to Ridge All wind pressures include a load factor of 0.6 Elev Kz Kzt qz GCPi Windward Leeward Side Total Minimum Press Press Press Press Pressure* ft psf psf psf psf psf psf psf 12.00 1.030 1.000 41.19 0.18 35.43 10.09 17.09 45.52 9.60 Notes Wall Pressures: Kz = Velocity Press Exp Coeff Kzt = Topographical Factor qz = 0.00256*Kz*Kzt*Kd*V^2 GCPi = Internal Press Coefficient Side = qh * G * Cp_SW qip * +GCPi Windward = qz * G * Cp_WW qip * +GCPi Leeward = qh * G * Cp_LW qip * +GCPi Total = Windward Press Leeward Press * Minimum Pressure: Para 27.4.7 no less than 9.60 psf (Incl LF) applied to Walls + Pressures Acting TOWARD Surface Pressures Acting AWAY from Surface Roof Wind Pressures for Positive & Negative Internal Pressure (+/ GCPi) Normal to Ridge All wind pressures include a load factor of 0.6 Roof Var Start End Cp_min Cp_max GCPi Pressure Pressure Pressure Pressure Dist Dist Pn_min* Pp_min* Pn_max Pp_max ft ft psf psf psf psf Roof_LW N/A N/A 0.620 0.620 0.180 14.29 29.12 14.29 29.12 Roof_WW N/A N/A 0.180 1.060 0.180 1.11 13.72 29.70 44.53 Notes Roof Pressures: Start Dist = Start Dist from Windward Edge End Dist = End Dist from Windward Edge Cp_Max = Largest Coefficient Magnitude Cp_Min = Smallest Coefficient Magnitude Pp_max = qh*G*Cp_max qip*(+GCPi) Pn_max = qh*G*Cp_max qin*(GCpi) Pp_min* = qh*G*Cp_min qip*(+GCPi) Pn_min* = qh*G*Cp_min qin*(GCPi) OH = Overhang X = Dir along Ridge Y = Dir Perpendcular to Ridge Z = Vertical * The smaller uplift pressures due to Cp_Min can become critical when wind is combined with roof live load or snow load; load combinations are given in ASCE 7 + Pressures Acting TOWARD Surface Pressures Acting AWAY from Surface MWFRS Wind Parallel to Ridge (Ref Fig 27.41} h = Mean Roof Height Of Building = 12.688 ft RHt = Ridge Height Of Roof = 13.375 ft B = Horizontal Dimension Of Building Normal To Wind Direction = 11.000 ft L = Horizontal Dimension Of building Parallel To Wind Direction = 21.000 ft L/B = Ratio Of L/B used For Cp determination = 1.909 h/L = Ratio Of h/L used For Cp determination = 0.604 Slope = Slope of Roof = 14.04 Deg Roof = **Roof Coeff (0 to h/2) (0.000 ft to 6.344 ft) = 0.18, 0.958 Roof_1 = Roof Coeff (h/2 to h) (6.344 ft to 12.688 ft) = 0.18, 0.858 Roof_2 = Roof Coeff (h to 2h) (12.688 ft to 25.375 ft) = 0.18, 0.542 **Includes Reduction Factor 0.91 For roof area, applied To Cp=1.3 For h/L>=1 & (0 To h/2) Cp_WW = Windward Wall Coefficient (All L/B Values) = 0.80 Cp_LW = Leward Wall Coefficient Using L/B = 0.32 Cp_SW = Side Wall Coefficient (All L/B values) = 0.70 GCpn_WW = Parapet Combined Net Pressure Coefficient (Windward Parapet) = 1.50 GCpn_LW = Parapet Combined Net Pressure Coefficient (Leeward Parapet) = 1.00 Wall Wind Pressures based On Positive Internal Pressure (+GCPi) Parallel to Ridge All wind pressures include a load factor of 0.6 Elev Kz Kzt qz GCPi Windward Leeward Side Total Minimum Press Press Press Press Pressure* ft psf psf psf psf psf psf psf 13.38 1.030 1.000 41.19 0.18 20.60 18.56 31.92 39.15 9.60 12.69 1.030 1.000 41.19 0.18 20.60 18.56 31.92 39.15 9.60 12.00 1.030 1.000 41.19 0.18 20.60 18.56 31.92 39.15 9.60 Wall Wind Pressures based on Negative Internal Pressure (GCPi) Parallel to Ridge All wind pressures include a load factor of 0.6 Elev Kz Kzt qz GCPi Windward Leeward Side Total Minimum Press Press Press Press Pressure* ft psf psf psf psf psf psf psf 13.38 1.030 1.000 41.19 0.18 35.43 3.73 17.09 39.15 9.60 12.69 1.030 1.000 41.19 0.18 35.43 3.73 17.09 39.15 9.60 12.00 1.030 1.000 41.19 0.18 35.43 3.73 17.09 39.15 9.60 Notes Wall Pressures: Kz = Velocity Press Exp Coeff Kzt = Topographical Factor qz = 0.00256*Kz*Kzt*Kd*V^2 GCPi = Internal Press Coefficient Side = qh * G * Cp_SW qip * +GCPi Windward = qz * G * Cp_WW qip * +GCPi Leeward = qh * G * Cp_LW qip * +GCPi Total = Windward Press Leeward Press * Minimum Pressure: Para 27.4.7 no less than 9.60 psf (Incl LF) applied to Walls + Pressures Acting TOWARD Surface Pressures Acting AWAY from Surface Roof Wind Pressures for Positive & Negative Internal Pressure (+/ GCPi) Parallel to Ridge All wind pressures include a load factor of 0.6 Roof Var Start End Cp_min Cp_max GCPi Pressure Pressure Pressure Pressure Dist Dist Pn_min* Pp_min* Pn_max Pp_max ft ft psf psf psf psf Roof (+Y) 0.000 6.344 0.180 0.958 0.180 1.11 13.72 26.14 40.97 Roof_1 (+Y) 6.344 12.688 0.180 0.858 0.180 1.11 13.72 22.64 37.47 Roof_2 (+Y) 12.688 25.375 0.180 0.542 0.180 1.11 13.72 11.55 26.38 Notes Roof Pressures: Start Dist = Start Dist from Windward Edge End Dist = End Dist from Windward Edge Cp_Max = Largest Coefficient Magnitude Cp_Min = Smallest Coefficient Magnitude Pp_max = qh*G*Cp_max qip*(+GCPi) Pn_max = qh*G*Cp_max qin*(GCpi) Pp_min* = qh*G*Cp_min qip*(+GCPi) Pn_min* = qh*G*Cp_min qin*(GCPi) OH = Overhang X = Dir along Ridge Y = Dir Perpendcular to Ridge Z = Vertical * The smaller uplift pressures due to Cp_Min can become critical when wind is combined with roof live load or snow load; load combinations are given in ASCE 7 + Pressures Acting TOWARD Surface Pressures Acting AWAY from Surface Components And Cladding (C&C) Calculations per Ch 30 Part 1: EHt = Eave Height = 12.000 ft RHt = Ridge Height = 13.375 ft h = Mean Roof Height: 0.5*(EHt+RHt) = 12.688 ft Zh = Mean Roof Height for Kh: h + Base_Dist = 12.688 ft Kh = Since Zh<15 ft [4.572 m] > 2.01 * ( [15 ft or 4.572 m] / zg)^(2/Alpha)= 1.030 Kzt = Topographic Factor is 1 since no Topographic feature specified = 1.000 Kd = Wind Directionality Factor per Table 26.61 = 0.85 GCPi = Ref Table 26.111 for Enclosed Building = +/0.18 LF = Load Factor based upon ASD Design = 0.60 qh = (0.00256 * Kh * Kzt * Kd * V^2) * LF = 41.19 psf LHD = Least Horizontal Dimension: Min(B, L) = 11.000 ft a1 = Min(0.1 * LHD, 0.4 * h = 1.100 ft a = Max(a1, 0.04 * LHD, 3 ft [0.9 m]) = 3.000 ft Wind Pressures for C&C Ch 30 Pt 1 All wind pressures include a load factor of 0.6 Description Zone Width Span Area 1/3 Ref GCp GCp p p Rule Fig Max Min Max Min ft ft ft sq ft psf psf D1 4 3.000 6.800 20.40 No 30.41 0.945 1.045 46.36 50.47 D2 4 3.000 6.800 20.40 No 30.41 0.945 1.045 46.36 50.47 Area = Span Length x Effective Width 1/3 Rule = Effective width need not be less than 1/3 of the span length GCp = External Pressure Coefficients taken from Figures 30.41 through 30.47 p = Wind Pressure: qh*(GCp GCpi) [Eqn 30.41]* *Per Para 30.2.2 the Minimum Pressure for C&C is 9.60 psf [0.460 kPa] {Includes LF} MecaWind v2318 Software Developer: Meca Enterprises Inc., www.meca.biz, Copyright © 2018 Calculations Prepared by: Date: Feb 10, 2021 Project #: Port Designer: Percy Malpartida Location: Port st luci FileLocation : Basic Wind Parameters Wind Load Standard = ASCE 710 Exposure Category = D Wind Design Speed = 175.0 mph Risk Category = III Structure Type = Building Building Type = Enclosed General Wind Settings = ASCE 710 Wind Parameters = Incl_LF = Include ASD Load Factor of 0.6 in Pressures = True DynType = Dynamic Type of Structure = Rigid NF = Natural Frequency of Structure (Mode 1) = 1.000 Hz NF = Natural Frequency of Structure = 1.000 Hz Zg = Altitude (Ground Elevation) above Sea Level = 0.000 ft Bdist = Base Elevation of Structure = 0.000 ft GenElev = Specify the Elevations For Wind Pressures = Mean Roof Ht SDB = Simple Diaphragm Building = False MWFRS = Analysis Procedure being used for MWFRS = Ch 27 Pt 1 C&C = Analysis Procedure being used for C&C = Ch 30 Pt 1 MWFRSType = MWFRS Method Selected = Ch 27 Pt 1 Topographic Factor per Fig 26.81 Topo = Topographic Feature = None Kzt = Topographic Factor = 1.000 Building Inputs RoofType: Building Roof Type = MultiGabled : MultiGabled = W : Width Perp to Ridge = 11.000 ft L : Length Along Ridge = 21.000 ft EHt : Eave Height = 12.000 ft RE : Roof Entry Method = Slope Slope : Slope of Roof = 3.0 :12 Parapet : Type of Parapet = None Theta : Roof Slope = 14.04 Deg Par : Is there a Parapet = False OH_ALL : None = 0.000 ft OH_ALL : None = 0.000 ft OH_ALL : None = 0.000 ft Exposure Constants per Table 26.91: Alpha: Const from Table 26.91= 11.500 Zg: Const from Table 26.91= 700.000 ft At: Const from Table 26.91= 0.087 Bt: Const from Table 26.91= 1.070 Am: Const from Table 26.91= 0.111 Bm: Const from Table 26.91= 0.800 C: Const from Table 26.91= 0.150 Eps: Const from Table 26.91= 0.125 Overhang Inputs: Std = Overhangs on all sides are the same = True OHType = Type of Roof Wall Intersections = None Main Wind Force Resisting System (MWFRS) Calculations per Ch 27 Part 1: EHt = Eave Height = 12.000 ft RHt = Ridge Height = 13.375 ft h = Mean Roof Height: 0.5*(EHt+RHt) = 12.688 ft Zh = Mean Roof Height for Kh: h + Base_Dist = 12.688 ft Kh = Since Zh<15 ft [4.572 m] > 2.01 * (15/zg)^(2/Alpha) = 1.030 Kzt = Topographic Factor is 1 since no Topographic feature specified = 1.000 Kd = Wind Directionality Factor per Table 26.61 = 0.85 GCPi = Ref Table 26.111 for Enclosed Building = +/0.18 RA = Roof Area = 238.11 sq ft LF = Load Factor based upon ASD Design = 0.60 qh = (0.00256 * Kh * Kzt * Kd * V^2) * LF = 41.19 psf qin = For Negative Internal Pressure of Enclosed Building use qh*LF = 41.19 psf qip = For Positive Internal Pressure of Enclosed Building use qh*LF = 41.19 psf Gust Factor Calculation: Gust Factor Category I Rigid Structures Simplified Method G1 = For Rigid Structures (Nat. Freq.>1 Hz) use 0.85 = 0.85 Gust Factor Category II Rigid Structures Complete Analysis Zm = 0.6 * Ht = 7.613 ft Izm = Cc * (33 / Zm) ^ 0.167 = 0.192 Lzm = L * (Zm / 33) ^ Epsilon = 541.116 Q = (1 / (1 + 0.63 * ((B + Ht) / Lzm)^0.63))^0.5 = 0.959 G2 = 0.925*((1+1.7*lzm*3.4*Q)/(1+1.7*3.4*lzm)) = 0.905 Gust Factor Used in Analysis G = Lessor Of G1 Or G2 = 0.850 MWFRS Wind Normal to Ridge (Ref Fig 27.41} h = Mean Roof Height Of Building = 12.688 ft RHt = Ridge Height Of Roof = 13.375 ft B = Horizontal Dimension Of Building Normal To Wind Direction = 21.000 ft L = Horizontal Dimension Of building Parallel To Wind Direction = 11.000 ft L/B = Ratio Of L/B used For Cp determination = 0.524 h/L = Ratio Of h/L used For Cp determination = 1.153 Slope = Slope of Roof = 14.04 Deg Roof_LW = Roof Coefficient (Leeward) = 0.62, 0.62 Roof_WW = Roof Coefficient (Windward) = 0.18, 1.06 Cp_WW = Windward Wall Coefficient (All L/B Values) = 0.80 Cp_LW = Leward Wall Coefficient Using L/B = 0.50 Cp_SW = Side Wall Coefficient (All L/B values) = 0.70 GCpn_WW = Parapet Combined Net Pressure Coefficient (Windward Parapet) = 1.50 GCpn_LW = Parapet Combined Net Pressure Coefficient (Leeward Parapet) = 1.00 Wall Wind Pressures based On Positive Internal Pressure (+GCPi) Normal to Ridge All wind pressures include a load factor of 0.6 Elev Kz Kzt qz GCPi Windward Leeward Side Total Minimum Press Press Press Press Pressure* ft psf psf psf psf psf psf psf 12.00 1.030 1.000 41.19 0.18 20.60 24.92 31.92 45.52 9.60 Wall Wind Pressures based on Negative Internal Pressure (GCPi) Normal to Ridge All wind pressures include a load factor of 0.6 Elev Kz Kzt qz GCPi Windward Leeward Side Total Minimum Press Press Press Press Pressure* ft psf psf psf psf psf psf psf 12.00 1.030 1.000 41.19 0.18 35.43 10.09 17.09 45.52 9.60 Notes Wall Pressures: Kz = Velocity Press Exp Coeff Kzt = Topographical Factor qz = 0.00256*Kz*Kzt*Kd*V^2 GCPi = Internal Press Coefficient Side = qh * G * Cp_SW qip * +GCPi Windward = qz * G * Cp_WW qip * +GCPi Leeward = qh * G * Cp_LW qip * +GCPi Total = Windward Press Leeward Press * Minimum Pressure: Para 27.4.7 no less than 9.60 psf (Incl LF) applied to Walls + Pressures Acting TOWARD Surface Pressures Acting AWAY from Surface Roof Wind Pressures for Positive & Negative Internal Pressure (+/ GCPi) Normal to Ridge All wind pressures include a load factor of 0.6 Roof Var Start End Cp_min Cp_max GCPi Pressure Pressure Pressure Pressure Dist Dist Pn_min* Pp_min* Pn_max Pp_max ft ft psf psf psf psf Roof_LW N/A N/A 0.620 0.620 0.180 14.29 29.12 14.29 29.12 Roof_WW N/A N/A 0.180 1.060 0.180 1.11 13.72 29.70 44.53 Notes Roof Pressures: Start Dist = Start Dist from Windward Edge End Dist = End Dist from Windward Edge Cp_Max = Largest Coefficient Magnitude Cp_Min = Smallest Coefficient Magnitude Pp_max = qh*G*Cp_max qip*(+GCPi) Pn_max = qh*G*Cp_max qin*(GCpi) Pp_min* = qh*G*Cp_min qip*(+GCPi) Pn_min* = qh*G*Cp_min qin*(GCPi) OH = Overhang X = Dir along Ridge Y = Dir Perpendcular to Ridge Z = Vertical * The smaller uplift pressures due to Cp_Min can become critical when wind is combined with roof live load or snow load; load combinations are given in ASCE 7 + Pressures Acting TOWARD Surface Pressures Acting AWAY from Surface MWFRS Wind Parallel to Ridge (Ref Fig 27.41} h = Mean Roof Height Of Building = 12.688 ft RHt = Ridge Height Of Roof = 13.375 ft B = Horizontal Dimension Of Building Normal To Wind Direction = 11.000 ft L = Horizontal Dimension Of building Parallel To Wind Direction = 21.000 ft L/B = Ratio Of L/B used For Cp determination = 1.909 h/L = Ratio Of h/L used For Cp determination = 0.604 Slope = Slope of Roof = 14.04 Deg Roof = **Roof Coeff (0 to h/2) (0.000 ft to 6.344 ft) = 0.18, 0.958 Roof_1 = Roof Coeff (h/2 to h) (6.344 ft to 12.688 ft) = 0.18, 0.858 Roof_2 = Roof Coeff (h to 2h) (12.688 ft to 25.375 ft) = 0.18, 0.542 **Includes Reduction Factor 0.91 For roof area, applied To Cp=1.3 For h/L>=1 & (0 To h/2) Cp_WW = Windward Wall Coefficient (All L/B Values) = 0.80 Cp_LW = Leward Wall Coefficient Using L/B = 0.32 Cp_SW = Side Wall Coefficient (All L/B values) = 0.70 GCpn_WW = Parapet Combined Net Pressure Coefficient (Windward Parapet) = 1.50 GCpn_LW = Parapet Combined Net Pressure Coefficient (Leeward Parapet) = 1.00 Wall Wind Pressures based On Positive Internal Pressure (+GCPi) Parallel to Ridge All wind pressures include a load factor of 0.6 Elev Kz Kzt qz GCPi Windward Leeward Side Total Minimum Press Press Press Press Pressure* ft psf psf psf psf psf psf psf 13.38 1.030 1.000 41.19 0.18 20.60 18.56 31.92 39.15 9.60 12.69 1.030 1.000 41.19 0.18 20.60 18.56 31.92 39.15 9.60 12.00 1.030 1.000 41.19 0.18 20.60 18.56 31.92 39.15 9.60 Wall Wind Pressures based on Negative Internal Pressure (GCPi) Parallel to Ridge All wind pressures include a load factor of 0.6 Elev Kz Kzt qz GCPi Windward Leeward Side Total Minimum Press Press Press Press Pressure* ft psf psf psf psf psf psf psf 13.38 1.030 1.000 41.19 0.18 35.43 3.73 17.09 39.15 9.60 12.69 1.030 1.000 41.19 0.18 35.43 3.73 17.09 39.15 9.60 12.00 1.030 1.000 41.19 0.18 35.43 3.73 17.09 39.15 9.60 Notes Wall Pressures: Kz = Velocity Press Exp Coeff Kzt = Topographical Factor qz = 0.00256*Kz*Kzt*Kd*V^2 GCPi = Internal Press Coefficient Side = qh * G * Cp_SW qip * +GCPi Windward = qz * G * Cp_WW qip * +GCPi Leeward = qh * G * Cp_LW qip * +GCPi Total = Windward Press Leeward Press * Minimum Pressure: Para 27.4.7 no less than 9.60 psf (Incl LF) applied to Walls + Pressures Acting TOWARD Surface Pressures Acting AWAY from Surface Roof Wind Pressures for Positive & Negative Internal Pressure (+/ GCPi) Parallel to Ridge All wind pressures include a load factor of 0.6 Roof Var Start End Cp_min Cp_max GCPi Pressure Pressure Pressure Pressure Dist Dist Pn_min* Pp_min* Pn_max Pp_max ft ft psf psf psf psf Roof (+Y) 0.000 6.344 0.180 0.958 0.180 1.11 13.72 26.14 40.97 Roof_1 (+Y) 6.344 12.688 0.180 0.858 0.180 1.11 13.72 22.64 37.47 Roof_2 (+Y) 12.688 25.375 0.180 0.542 0.180 1.11 13.72 11.55 26.38 Notes Roof Pressures: Start Dist = Start Dist from Windward Edge End Dist = End Dist from Windward Edge Cp_Max = Largest Coefficient Magnitude Cp_Min = Smallest Coefficient Magnitude Pp_max = qh*G*Cp_max qip*(+GCPi) Pn_max = qh*G*Cp_max qin*(GCpi) Pp_min* = qh*G*Cp_min qip*(+GCPi) Pn_min* = qh*G*Cp_min qin*(GCPi) OH = Overhang X = Dir along Ridge Y = Dir Perpendcular to Ridge Z = Vertical * The smaller uplift pressures due to Cp_Min can become critical when wind is combined with roof live load or snow load; load combinations are given in ASCE 7 + Pressures Acting TOWARD Surface Pressures Acting AWAY from Surface Components And Cladding (C&C) Calculations per Ch 30 Part 1: EHt = Eave Height = 12.000 ft RHt = Ridge Height = 13.375 ft h = Mean Roof Height: 0.5*(EHt+RHt) = 12.688 ft Zh = Mean Roof Height for Kh: h + Base_Dist = 12.688 ft Kh = Since Zh<15 ft [4.572 m] > 2.01 * ( [15 ft or 4.572 m] / zg)^(2/Alpha)= 1.030 Kzt = Topographic Factor is 1 since no Topographic feature specified = 1.000 Kd = Wind Directionality Factor per Table 26.61 = 0.85 GCPi = Ref Table 26.111 for Enclosed Building = +/0.18 LF = Load Factor based upon ASD Design = 0.60 qh = (0.00256 * Kh * Kzt * Kd * V^2) * LF = 41.19 psf LHD = Least Horizontal Dimension: Min(B, L) = 11.000 ft a1 = Min(0.1 * LHD, 0.4 * h = 1.100 ft a = Max(a1, 0.04 * LHD, 3 ft [0.9 m]) = 3.000 ft Wind Pressures for C&C Ch 30 Pt 1 All wind pressures include a load factor of 0.6 Description Zone Width Span Area 1/3 Ref GCp GCp p p Rule Fig Max Min Max Min ft ft ft sq ft psf psf D1 4 3.000 6.800 20.40 No 30.41 0.945 1.045 46.36 50.47 D2 4 3.000 6.800 20.40 No 30.41 0.945 1.045 46.36 50.47 Area = Span Length x Effective Width 1/3 Rule = Effective width need not be less than 1/3 of the span length GCp = External Pressure Coefficients taken from Figures 30.41 through 30.47 p = Wind Pressure: qh*(GCp GCpi) [Eqn 30.41]* *Per Para 30.2.2 the Minimum Pressure for C&C is 9.60 psf [0.460 kPa] {Includes LF}