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Wyssling Consulting <br />76 N. Meadowbrook Drive <br />Alpine, UT 84004 <br />(201) 874-3483 <br />swyssling@wysslingconsulting.com <br />V = 95 Basic Wind Speed <br />Exposure C ASCE 7-16, Section 26.7 <br />Kz = 0.85 Velocity Pressure Coefficient, ASCE 7-16, Figure 26.10-1 <br />Kzt = 1 Topographic Factor, ASCE 7-16, Section 26.8.2 <br />Kd = 0.85 Directionality Factor, ASCE 7-16, Section 26.6 <br />Ke = 1 Ground Elevation Factor, ASCE 7-16, Section 26.9 <br />qh = 16.7 psf ASCE 7-16 Eq. 26.10-1 <br />Roof Q = 18 deg <br />sanchor = 48 in Horizontal spacing of roof anchors <br />Atrib = 6.81 sf Panel Area tributary to each roof anchor <br />GCp External Pressure Coefficient, ASCE 7-16, Figure 30.3-2 <br />Roof Zone Zone 1 2e 2n 2r 3e 3r <br />-2.00 -2.00 -3.00 -3.00 -3.00 -3.60 <br />ga = 0.80 Pressure Equalization Factor, ASCE 29.4.4 <br />gE = 1.50 Edge Array Factor, ASCE 29.4.4 Assumes worst case loading <br />pnet = qhGCpgEga =Design Wind Uplift Pressure, ASCE 7-16, Equation 30.4-1 <br />Roof Zone 1 2e 2n 2r 3e 3r <br />-40 psf -40 psf -60 psf -60 psf -60 psf -72 psf <br />pnet = -16 psf Minimum Design Wind Pressure, ASCE 7-16, Section 30.2.2 <br />Use 40 psf Use 40 psf Use 60 psf Use 60 psf Use 60 psf Use 72 psf ULTIMATE LOAD <br />24 psf 24 psf 36 psf 36 psf 36 psf 43 psf *0.6 ALLOWABLE LOAD <br />Connection to Existing Roof Framing <br />F.S. = 1 Additional Factor of Safety applied to withdrawl force, if desired <br />Atrib = 6.8 ft2 <br />DLpanel = 2.49 psf <br />Roof Zone 1 2e 2n 2r 3e 3r <br />Wuplift = 40 psf 40 psf 60 psf 60 psf 60 psf 72 psf <br />Plag = F.S. x Atrib x (0.6D - 0.6W) =Withdrawl force for each roof anchor <br />Roof Zone 1 2e 2n 2r 3e 3r <br />-153.5 lbs -153.5 lbs -235.4 lbs -235.4 lbs -235.4 lbs -284.5 lbs <br />Connection Capacity <br />db = 5/16 in Lag Screw diameter <br />Dpen = 2 1/2 in Lag Screw penetration into existing framing member <br />No. of Screws 1 Screws per Connection <br />Species of wood framing <br />C D = 1.6 Load Duration Factor for Wind Loading, NDS Table 2.3.2 <br />Ct = 0.7 Temperature Factor, NDS Table 10.3.4 <br />W = 266 lb/in Withdrawl Capacity, NDS Equation 11.2-1 <br />W' = C D x Ct x W = 298 lb/in Adjusted withdrawl value <br />Pallow = Dpen x W' = 745 lbs <br />Roof Zone 1 2e 2n 2r 3e 3r <br />DEMAND = 154 lbs 154 lbs 235 lbs 235 lbs 235 lbs 285 lbs <br />CAPACITY = 745 lbs 745 lbs 745 lbs 745 lbs 745 lbs 745 lbs Max Load=0.382 OK <br />Douglas Fir-Larch <br />Wind Uplift <br />Simplified Procedure for Componenets and Cladding <br />ASCE 7-16, Section 29.4 <br />2202 N Freeman St <br />02/08/22