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PRwER NAME: FLAKE BLDG TI <br /> J08: N9-1624 <br /> Compute diaphragm shear�s) per ASCE 7-OS§12.10.1.1 <br /> � <br /> ��, <br /> �-� <br /> /'�, _ �r�, <br /> �,t�'� <br /> �.� <br /> M1 fin F�,=0.2��S i,s!,��r, <br /> hlar F�,=0 AOS�,s l,���, <br /> Levcl N , P, F, A1in F , h1a� f., Uesi n F , <br /> I '9.7k ?.7k 37k 49k Q.71, .t9k <br /> Compute lateral reactions et the perimeter for the (flexible) diaphragm <br /> Shear force @ Grids C & B.e <br /> Diaphragm = 25 psf x 23.5 x Sa = 0.126 = 74 Iblft <br /> (1) Wall @ Grid 6.8 = 12 pst x '/z x 15 ft x 1 ft width x 0.126 = 11.3 Ib/ft <br /> Total load per grid (C' 28 B.8) _ (74 + 11.3) x 32.5 ft / 2 = 1386 Ib <br /> Shear force @ Grids 6 & 6.8 <br /> Diaphragm = 25 psf x 32.5 x Sa = 0.126 = 102.4 Ib/ft <br /> (2) Walls @ Grid C and B = 12 psf x 2 x Yz x 15 ft x 1 ft width x 0.126 = 22.6 Ib/ft <br /> Total load per grid (C & B) _ (102.4 + 22.6) x 23.25 ft / 2 = 1453 Ib <br /> Since the diaphragm will act as cantilever about Grid 6.8; <br /> Total shear @ Grid 6.8 = 2 x 1453 = 2906 Ib <br /> Overturning shear @ Grid B & C = 1453 Ib x 23.5 fl / 32.5 tt = 1051 Ib < 1386 Ib <br /> (therefore direct shear controls). <br /> ' Existing shear wall is used to react cantilever diaphragm loads. <br /> ' Length to existina shear wall �Grid C. <br /> e r <br /> CUSTOM DESIGN & ENGINEERING, INC. �'\ <br /> November t t, 2013 Page 161��' ) <br /> /-- / � <br /> C <br />