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PROJECT NAME: HULTS RESIDENCE <br /> JOB: X10-2854 <br /> For this structure since it is uniformly spaced, the 200 lb point load will control. Assume that the 200 lb will <br /> occur over two lattice segments, therefore 100 lb/member. <br /> — i1 @ h d N <br /> TOP SUPPORT <br /> LIVING R00M <br /> \1 08 <br /> A, N <br /> IIALL <br /> ( 001 ) ENTRY <br /> TYPE'X'G ALONG' 000 <br /> UNDERSIDE OF S1A1R <br /> LATTICE RAILING <br /> 1 w <br /> BOTTOM SUPPORT <br /> r1 FLOOR ASSEMBLY: <br /> • CLEAR SEALER <br /> • 4'CONCRETE SLAB ON <br /> M 4 BAR Co 24.0.C.EP <br /> Figure 9-Lattice railing support structure <br /> Typical lattice size is 2 x 3 hardwood (actual size) <br /> Sx = bd2/6 = 2.0 x 3.02/6 = 3.0 in3 <br /> A= 2.0 x 3.0 = 6.0 in2 <br /> Maximum load occurs @ mid height of the 11.25 ft <br /> Reaction = 100 lb/2 = 50 lb @ top & btm of member <br /> Moment = 50 lb x 11.25/2 = 281 ft-lb <br /> Bending stress, fb = M x 12/Sx = 281(12)/ 3.0 = 1124 psi <br /> Shear stress, fv = 1.5 x R/A = 1.5(50)/6.0 = 12.5 psi <br /> CUSTOM DESIGN & ENGINEERING, INC. <br /> October 20, 2021 Page 14/ 17 <br /> Copyright©2021 Custom Design&Engineering,Inc.All rights reserved. <br />