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LAG SCREW ANALYSIS <br />Loads <br />Wind Pressures qz = -50.87 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 = -627 lbs <br />Dead Load PD = QD * At = 37 lbs <br />Uplift Pa = 0.6 PD + 0.6 Pw = -354 lbs <br />Landscape <br />Tributary Area At = b * s = 6.85 ft2 <br />Wind Load PW = qz * At = -348 lbs <br />Dead Load PD = QD * At = 20.55 lbs <br />Uplift Pa = 0.6 PD + 0.6 Pw = -197 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*SG 3/2 *D 3/4 = 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' = 0.33 < 1 OK <br />1118 S Hickory St <br />06/05/23