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LAG SCREW ANALYSIS <br />Loads <br />Wind Pressures qz =-31.45 psf <br />Solar Panel Load QD =3 psf <br />Panel Length l =6.167 ft <br />Panel Width b 3.425 ft <br />Attachment Spacing s =4 ft <br />Portrait <br />Tributary Area At =12.33 ft2 <br />Wind Load PW = qz * At =-388 lbs <br />Dead Load PD = QD * At =37 lbs <br />Uplift Pa = 0.6 PD + 0.6 Pw =-211 lbs <br />Landscape <br />Tributary Area At = b * s =6.85 ft2 <br />Wind Load PW = qz * At =-215 lbs <br />Dead Load PD = QD * At =20.55 lbs <br />Uplift Pa = 0.6 PD + 0.6 Pw =-117 lbs <br />Lag Screw <br />Specific Gravity of Lumber SG =0.50 (Douglas Fir-Larch) <br />Diameter of Lag Screw D =1/4 in <br />Withdraw Design /in 1800*SG3/2*D3/4 =225 lbs/in <br />Depth of Embedment lp =2.50 in <br />Total Nominal Withdrawal Value W = W * l p =563 lbs <br />Load Duration Factor CD =1.6 <br />Withdrawal Design Value W' = W * C D =900 lbs <br />Demand Capacity Ratio DCR = Pa / W'=0.23 < 1 OK <br />315 E Stanford St - <br />201817961/30/2024