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AQX ENGINEERING <br /> STRUCTURAL CALCULATION p <br /> Project: UB-Everett Job No: 2016-SS-014 Calc. No. Rev.: 0 <br /> Subject: Roof Hatch Replacement Discipline: Structural <br /> Lag Screw Connection Design <br /> Design Tension T= 75.0 Ib <br /> Design Shear V= 75.0 Ib <br /> Using 1/4 "0 Lag Scerw w/ 2 "embedment <br /> Per 2012 NDS Table 11 J or 11 K, Z= 110 Ib <br /> Per 2012 NDS Table 11.2A, W= 225 Ib <br /> Per 2012 NDS Table 10.3.1 <br /> Z'=ZxCDxCMxCtxCgxCA xCeg <br /> where CD 1.6 (seismic &wind loads) <br /> CM 1 (<19%) <br /> Ct 1 (T_< 100°F) <br /> Cg 1 <br /> CA 0.75 (edge distance = 0.75 "} <br /> Ceg 0.75 <br /> Z'= 132 Ib <br /> W'= 270 lb <br /> For Combinated Lateral and Withdrawal loads <br /> Per 2012 NDS eq. 11.4-1 <br /> Za'= 212 > Design Force (OK) <br /> Total 4 screws <br /> Each Screw (2) STAIR MOUNTING CLIP <br /> T = 300/4 = 75 PER MANUF. W/ LAIN (2) <br /> V=300/4 - 75 1/4"4 LAG SCREWS, 2" <br /> EMBEDDED TO SUPPORT <br /> BM � <br /> j <br /> 1520 Brookhollow Dr.,Suite#45, Santa Ana, CA 92705 Tel: (714)662-051 <br /> Fax: (714)662-055 <br />