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Luis Labrada <br />809 Bowsprit, Suite 105 Project: Ross Common <br />Chula Vista, CA 91914 Engineer: A.H. <br />Phone: (619) 370-9515 Date : 10/19/2023 <br />www.lamareng.com <br />Guard Post Spacing =4.4 Ft.P <br />P =200 Lbs. <br />Height =42 In.H <br />Moment = M = 200 Lbs. * 42 In. =8400 In.-Lbs. <br />Use = <br />Section Modulus (S) = ( 2In.*2In.*2In./6)-(1.75In.* 1.75 In.*1.75 In./6) =0.44 In.3 <br />Bending Stress = M/S = 8400 In.-Lbs. / 0.4411 In.3 =19043 Psi. <br />Allowable Bending Stress = 0.66 Lbs.*36000 Psi. =23760 Psi. <br />19043 Psi. (Calc.)<23760 Psi. Allowable OK <br />Use =1/4 " fillet Area Aw = 0.707 * 0.25 In. = 0.18 In./In. <br />Weld Section Modulus = (b*d) + (d2/3) = 5.33 In.2 <br />f = 8400 In.-Lbs. / 5.33 In2. = 1576 #/In. <br />Shear Stress = f/Aw = 1576 #/In. / 0.18 In/In. = 8917 Psi. <br />Allowable Tension Stress = Base Metal = 30000 Psi. <br />8917 Psi. (Calc.)<30000 Psi. Allowable OK <br />GUARDRAIL CALCULATION - STAIR <br />POST DESIGN <br />2" x 2" x 1/8" Thk. Tube (36ksi) <br />SIZE FILLET WELD @ BASE <br />Page 9 of 19 <br />HOLD - 1223 N Ross <br />St3/4/2025