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Project: Linda Witas -- Job#: 17-03856 <br /> Date: 7/31/2017 Engineer: DN <br /> Framing Check <br /> ARRAY 1 PAss <br /> w=55 plf <br /> Dead Load 6.7 psf <br /> PV Load 3.0 psf <br /> Live Load 17.9 psf � 2x4 Top Chords @ 24"o.c. o <br /> Member Span=6'-3" <br /> Governing Load Comb. DL+LL Note:Attachments shall be Staggered. <br /> Total Load 27.6 psf <br /> [��� ��� Member Properties T�� <br /> Member Size S(in^3) I(in^4) Lumber Sp/Gr Member Spacing <br /> 2x4 3.06 5.36 SPF#2 @ 24"o.c. <br /> j �� �� Check Bending Stress ; <br /> Fb(psi)= f'b x Cd x Cf x Cr (NDS Table 43.1) <br /> 875 x 1.25 x 1.5 x 1.15 <br /> Allowed Bending Stress=1886.7 psi <br /> Maximum Moment = (wL^2)/8 <br /> = 269.392 ft# <br /> = 3232.7 in# <br /> Actual Bending Stress=(Maximum Moment)/S <br /> =1055.6 psi � <br /> Allouved>Actual--56%Stressed -- Therefore,OK � <br /> � ����^����� ���Check Deflection � ��4��T_� <br /> Allowed Deflection(Total Load) = L/180 (E=1400000 psi Per NDS) <br /> = 0.416 i n <br /> Deflection Criteria Based on = Continuous Span <br /> Actual Deflection(Total Load) _ (w*L^4)/(185*E*I) <br /> = 0.105 in <br /> = L/715 < L/180 Therefore OK <br /> Allowed Deflection(Live Load) = L/240 <br /> 0.312 in <br /> Actual Deflection(Live Load) _ (w*L^4)/(185*E*I) <br /> 0.068 in <br /> L/1103 < L/240 Therefore OK <br /> �-� _ --- Check Shear..�_��_�._ ..� �_. ..—.—� <br /> Member Area= 5.3 in^2 Fv(psi)= 135 psi (NDS Table 4A) <br /> Allowed Shear = Fv*A = 709 Ib Max Shear(V)=w*L/2 = 172 Ib <br /> Allowed>Actual--24.4%Stressed -- Therefore,OK <br />