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Check Top Chord of Existing Truss <br />Dec. 14, 2022 12:01 <br />Design Check Calculation Sheet <br />WoodWorks Sizer 2019 (Update 4) <br />Loads: <br />Load Type Distribution Pat- Location [ft] Magnitude Unit <br /> tern Start End Start End <br />Roof-DL Dead Full Area No 10.00(24.0") psf <br />Roof-LLR Roof constr. Full Area Yes 20.00(24.0") psf <br />PV1 Dead Point No 2.00 32 lbs <br />PV2 Dead Point No 7.00 32 lbs <br />Maximum Reactions (lbs) and Bearing Lengths (in) : <br />1.67' 8.67' <br />16.498' <br />15.67'0' <br />Unfactored: <br /> Dead 132 206 56 <br /> Roof Live 200 343 127 <br />Factored: <br /> Total 332 549 182 <br />Bearing: <br /> Length 0.50* 0.50* 0.50* <br /> Min req'd 0.50* 0.47** 0.50* <br />*Minimum bearing length setting used: 1/2" for end supports and 1/2" for interior supports <br />**Minimum bearing length governed by the required width of the supporting member. <br /> Lumber-soft, D.Fir-L, No.2, 2x4 (1-1/2"x3-1/2") <br />Supports: All - Timber-soft Beam, D.Fir-L No.2 <br />Roof joist spaced at 24.0" c/c; Total length: 16.56'; Clear span(horz): 1.625', 6.938', 6.938'; Volume = 0.6 cu.ft.; Slope: 18.0 deg <br />Lateral support: top = continuous, bottom = 2'-0 (in); Repetitive factor: applied where permitted (refer to online help); <br />This section PASSES the design code check. <br />Analysis vs. Allowable Stress and Deflection using NDS 2018 : <br /> Criterion Analysis Value Design Value Unit Analysis/Design <br /> Shear fv = 74 Fv' = 225 psi fv/Fv' = 0.33 <br /> Bending(+) fb = 1039 Fb' = 1941 psi fb/Fb' = 0.54 <br /> Bending(-) fb = 1517 Fb' = 1917 psi fb/Fb' = 0.79 <br />Deflection: <br /> Interior Dead 0.05 = < L/999 <br /> Live 0.20 = L/431 0.37 = L/240 in 0.56 <br /> Total 0.26 = L/344 0.49 = L/180 in 0.52 <br /> Cantil. Dead -0.05 = L/416 <br /> Live -0.16 = L/132 0.18 = L/120 in 0.91 <br /> Total -0.21 = L/100 0.23 = L/90 in 0.90 <br />Design Notes: <br />1. Analysis and design are in accordance with the ICC International Building Code (IBC 2018) and the National Design Specification (NDS 2018), using <br />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. Continuous or Cantilevered Beams: NDS Clause 4.2.5.5 requires that normal grading provisions be extended to the middle 2/3 of 2 span beams and to <br />the full length of cantilevers and other spans. <br />4. Sawn lumber bending members shall be laterally supported according to the provisions of NDS Clause 4.4.1. <br />5. SLOPED BEAMS: level bearing is required for all sloped beams. <br />6. The critical deflection value has been determined using maximum back-span deflection. Cantilever deflections do not govern design. <br />2238 W Harvard St <br />01/30/23