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SHEET: 6 OF 7 <br />DATE: <br />DE JOB NO.: <br />CHECK SCREW ATTACHMENTS FOR WIND UPLIFT <br />Pwuplift =182.4 lb 5/16" Lag with min 1.5" penetration for each attachment <br />Table 12.2A - NDS - Lag Screw Withdrawal Values <br />For 5/16" Lag into .5G wood 266 lb <br />Allowable wind load = 1.6*1.5*266 638.4 lb > 182.4 lb OK <br />CHECK SCREW ATTACHMENTS FOR SHEAR DUE TO SEISMIC Fp <br />Fp = 46.15 lb <br />Roof slope/module tilt 22 deg <br />Shear = Fp*cos( 22 ) = 42.8 lb Fp sin(ang) <br />Tension = Fp*sin( 22 ) = 17.3 lb <br />Fp cos(ang) <br />Table 11K - NDS Z = 190 lb <br />CD = 1.6 ` <br />Z' = Z*CD =304 lb > 42.8 lb OK Withdrawal capacity W' = 638.4 lb <br />Interaction Equation ft/Ft+fv/Fv 0.313 + 0.141 = 0.454 < 1 OK <br />RAIL SPAN CHECK <br />Unirac NXT Rail check Invisimount Rail Properties <br />Tributary width = half a panel Moment of Inertia I = 0.2 in^4 <br />wtrib =3.083 ft Section Modules S = 0.168 in^3 <br />Uniform Load = wind load * trib Yield Strength y =35000 psi <br />wSWH =34 plf Tensile Strength u =38000 psi <br />Span = distance between attachment points = L Masd allow = 0.6*y*S 294 lb-ft <br />L = 6 ft <br />MSWH = Wswh*L /8 154 lb-ft < 294 lb-ft OK <br />8/23/2024 <br />GUC-2909 <br />PROJECT: <br />CLIENT: <br />BY: <br />PV Panels for Rodolfo Moreno <br />Guyou Construction, Inc. <br />Doug Engineering <br />1017 N Wright St <br />11/4/2024