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Check Top Chord of Existing Truss <br />Nov. 8, 2022 15:12 <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 />PV3 Dead Point No 8.50 32 lbs <br />PV4 Dead Point No 12.50 32 lbs <br />Self-weight Dead Full UDL No 1.2 plf <br />Maximum Reactions (lbs) and Bearing Lengths (in) : <br />1.67' 8.67' <br />18.709' <br />15.67'0' <br />Unfactored: <br /> Dead 154 283 88 <br /> Roof Live 201 329 130 <br />Factored: <br /> Total 356 613 217 <br />Bearing: <br /> Length 0.50* 0.52 0.50* <br /> Min req'd 0.50* 0.52** 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: 18.88'; Clear span(horz): 1.625', 6.938', 6.938'; Volume = 0.7 cu.ft.; Slope: 33.0 deg <br />Lateral support: top = continuous, bottom = at all supports; 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* = 70 Fv' = 225 psi fv*/Fv' = 0.31 <br /> Bending(+) fb = 1243 Fb' = 1941 psi fb/Fb' = 0.64 <br /> Bending(-) fb = 1703 Fb' = 1794 psi fb/Fb' = 0.95 <br />Deflection: <br /> Interior Dead 0.13 = L/778 <br /> Live 0.26 = L/380 0.42 = L/240 in 0.63 <br /> Total 0.39 = L/255 0.56 = L/180 in 0.70 <br /> Cantil. Dead -0.06 = L/379 <br /> Live -0.21 = L/116 0.20 = L/120 in 1.03 <br /> Total -0.27 = L/89 0.27 = L/90 in 1.01 <br />*The effect of point loads within a distance d of the support <br /> has been included as per NDS 3.4.3.1 <br />2045 S Garnsey St <br />03/06/23