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Vertical Load Resisting System Design <br />Roof Framing Rafters <br />Snow Load Fully Exposed <br />pg=0 psf Ct =1.1 <br />Ce =0.9 Is =1.0 ps = 0 psf <br />pf = 0 psf pfmin. = 0.0 psf 0 plf <br />Max Length, L =8.1 ft <br />Tributary Width, WT =24 in <br />RLL =20 psf 17.98 plf <br />Dr =10 psf 20 plf <br />PvDL =3 psf 6 plf <br />Load Case: DL w=26 plf <br />M=189 lb-ft <br />Mallowable = Sx x Fb'=309 lb-ft >189 lb-ft OK <br />Load Case: DL+RLL DL+Lr=38 plf <br />Mdown=276 lb-ft <br />Mallowable = Sx x Fb'=429 lb-ft >276 lb-ft OK <br />Load Case: DL+S DL+S=26 plf <br />Mdown=189 lb-ft <br />Mallowable = Sx x Fb'=412 lb-ft >189 lb-ft OK <br />Load Case: DL+0.6W w=31.4 plf <br />Mu=228 lb-ft <br />Mallowable = Sx x Fb' (wind)=549 lb-ft >228 lb-ft OK <br />Load Case: 0.6DL+0.6W w=20.2 plf <br />Mu=146 lb-ft <br />Mallowable = Sx x Fb' (wind)=549 lb-ft >146 lb-ft OK <br />DL+0.45W+0.75(RLL or S)29 plf <br />Mdown=213 lb-ft <br />Mallowable = Sx x Fb'=549 lb-ft >213 lb-ft OK <br />Member Capacity <br />DF-L No.2 <br />2X4 CL CF Ci Cr <br />Fb =900 psi 1.0 1.3 1.0 1.15 1346 psi <br />Fv =180 psi N/A N/A 1.0 N/A 180 psi <br />E =1600000 psi N/A N/A 1.0 N/A 1600000 psi <br />Emin =580000 psi N/A N/A 1.0 N/A 580000 psi <br />Depth, d =3.5 in <br />Width, b =1.5 in <br />Cross-Sectonal Area, A =5.25 in2 <br />Moment of Inertia, Ixx =5.35938 in4 <br />Section Modulus, Sxx =3.0625 in3 <br />Allowable Moment, Mall = Fb'Sxx =343.4 lb-ft DCR=Mu/Mall =0.64 < 1 <br />Allowable Shear, Vall = 2/3Fv'A =630.0 lb DCR=Vu/Vall =0.24 < 1 <br />Design Value Adjusted Value <br />Satisfactory <br />Satisfactory <br />projects@evengineersnet.com <br />http://www.evengineersnet.com <br />HISTORIC-526 S <br />Ross St3/21/2025