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WoodWorks® Sizer SOFTWARE FOR WOOD DESIGN <br />WoodWorks® Sizer 2019 (Update 3) Rafter1.wwb Page 2 <br />Analysis vs. Allowable Stress and Deflection using NDS 2018 : <br /> Criterion Analysis Value Design Value Unit Analysis/Design <br /> Shear fv = 38 Fv' = 225 psi fv/Fv' = 0.17 <br /> Bending(+) fb = 1022 Fb' = 1682 psi fb/Fb' = 0.61 <br /> Live Defl'n 0.26 = L/523 0.56 = L/240 in 0.46 <br /> Total Defl'n 0.54 = L/252 0.75 = L/180 in 0.71 <br />Additional Data: <br />FACTORS: F/E(psi) CD CM Ct CL CF Cfu Cr Cfrt Ci Cn LC# <br /> Fv' 180 1.25 1.00 1.00 - - - - 1.00 1.00 1.00 2 <br /> Fb'+ 900 1.25 1.00 1.00 1.000 1.300 - 1.15 1.00 1.00 - 2 <br /> Fcp' 625 - 1.00 1.00 - - - - 1.00 1.00 - - <br /> E' 1.6 million 1.00 1.00 - - - - 1.00 1.00 - 2 <br /> Emin' 0.58 million 1.00 1.00 - - - - 1.00 1.00 - 2 <br />CRITICAL LOAD COMBINATIONS: <br /> Shear : LC #2 = D + L <br /> Bending(+): LC #2 = D + L <br /> Deflection: LC #2 = D + L (live) <br /> LC #2 = D + L (total) <br /> Bearing : Support 1 – LC #2 = D + L <br /> Support 2 – LC #2 = D + L <br /> D=dead L=construction <br /> All LC's are listed in the Analysis output <br /> Load combinations: <br />CALCULATIONS: <br /> V max = 228, V design = 209 lbs; M(+) = 644 lbs-ft <br /> EIy = 33.27 lb-in^2 <br /> "Live" deflection is due to all non-dead loads (live, wind, snow…) <br /> Total deflection = 1.5 dead + "live" <br /> Bearing: Allowable bearing at an angle F'theta calculated for each support <br /> as per NDS 3.10.3 <br />Design Notes: <br />1. Analysis and design are in accordance with the ICC International Building Code (IBC 2018) and the National Design <br />Specification (NDS 2018), using Allowable Stress Design (ASD). Design values are from the NDS Supplement. <br />2. Please verify that the default deflection limits are appropriate for your application. <br />3. Sawn lumber bending members shall be laterally supported according to the provisions of NDS Clause 4.4.1. <br />4. SLOPED BEAMS: level bearing is required for all sloped beams. <br />2010 & 2012 N Bush Ave, <br />#100 and #1012/21/2025