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HomeMy WebLinkAboutX2019-0058 - CalcsGUARDRAIL CALCULATION Design Criteria Rail Attachment Max. Spacing = 4.00 = 1.25 ft Horizontal Load At Top of Railing = 50.00 = 3,000.00 lbs/ft Concentrated Load any direction = 200.00 lb Rail Height (max.) = 3.50 = 3.00 ft material Used Try 1.5in x 1.5in Steel Rod Q 4'-0" O.C. Yeild Strength = 36,000.00 psi Bending Strength (Fb = 0.6Fy) = 21,600.00 psi Section Modulus (Sx) = 0.56 in"3 Post. Member Design v = 50 ps£ x 4 ft = M = 200 lbs x 3.5 ft = fb = 700 ft -lbs x 12 /0.56 in3 = Guardrail Attachment T = 700 ft -lbs x 12 /3.5 in = Required Lag Bolt Capacity /1" 2400 = Req. = 2 Bolt x5" Thread x0.85 Env OD 4�3 ,20/ )(2-01q- 0058 321 MOMM ire 200.00 lbs 700.00 ft -lbs 14,933.33 psi < Fb OK v 2,400.00 lbs 282.35 lbs From Table 11.2A NDS 2001 for Lag Screw Size = 3/8 in Wood Grade DF -L, G = 0.5 Capacity = 305.00 lbs > 282.35 OK Use 4-3/8" x 4" Lag Bolts w/ 1/8" Thick Wachers Base Plate Design Arm = (3.5" - 1")/2 = 1.25 in M = 2400 lbs x 1.25 in = 3,000.00 in -lbs Plate Thickness Required (t) b = Plate Width = 3.00 in t = sgrt{6 M /b Fb} = 0.53 in Use t - 0.50 in N Exp. 06-30-2019 OF 3'-6" 1" 1" 3" 1.. 3.. 1.. 1/2"x5"x5" Base Plate TYPICAL GUARDRAIL ATTACHMENT steel Railing on wood, Guardrail Over Wood Floor Page 1