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LAG SCREW ANALYSIS <br />Loads <br />Wind Pressures qz =-65.94 psf <br />Solar Panel Load QD =3 psf <br />Panel Length l =5.650 ft <br />Panel Width b 3.7167 ft <br />Attachment Spacing s =6 ft <br />Portrait <br />Tributary Area At =16.95 ft2 <br />Wind Load PW = qz * At =-1118 lbs <br />Dead Load PD = QD * At =50.85 lbs <br />Uplift Pa = 0.6 PD + 0.6 Pw =-640 lbs <br />Landscape <br />Tributary Area At = b * s =11.15 ft2 <br />Wind Load PW = qz * At =-735 lbs <br />Dead Load PD = QD * At =33.45 lbs <br />Uplift Pa = 0.6 PD + 0.6 Pw =-421 lbs <br />Lag Screw <br />Specific Gravity of Lumber SG =0.50 (Douglas Fir-Larch) <br />Diameter of Lag Screw D =5/16 in <br />Withdraw Design /in 1800*SG3/2*D3/4 =266 lbs/in <br />Depth of Embedment lp =2.50 in <br />Total Nominal Withdrawal Value W = W * l p =665 lbs <br />Load Duration Factor CD =1.6 <br />Withdrawal Design Value W' = W * C D =1064 lbs <br />Demand Capacity Ratio DCR = Pa / W'=0.60 < 1 OK <br />2306 N Spinnaker St - <br />2018163712/18/2023