Laserfiche WebLink
Check Top Chord of Existing Truss <br />Dec. 13, 2022 14:02 <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 13.50 32 lbs <br />Maximum Reactions (lbs) and Bearing Lengths (in) : <br />1.67' 8.67' 15.67' <br />23.859' <br />22.67' <br />Unfactored: <br /> Dead 134 229 182 59 <br /> Roof Live 203 331 334 128 <br />Factored: <br /> Total 338 560 516 187 <br />Bearing: <br /> Length 0.50* 0.50* 0.50* 0.50* <br /> Min req'd 0.50* 0.48** 0.44** 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: 23.94'; Clear span(horz): 1.625', 6.938', 6.938', 6.938'; Volume = 0.9 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* = 75 Fv' = 225 psi fv*/Fv' = 0.33 <br /> Bending(+) fb = 1109 Fb' = 1941 psi fb/Fb' = 0.57 <br /> Bending(-) fb = 1410 Fb' = 1917 psi fb/Fb' = 0.74 <br />Deflection: <br /> Interior Dead 0.08 = < L/999 <br /> Live 0.21 = L/416 0.37 = L/240 in 0.58 <br /> Total 0.29 = L/300 0.49 = L/180 in 0.60 <br /> Cantil. Dead -0.06 = L/365 <br /> Live -0.17 = L/123 0.18 = L/120 in 0.97 <br /> Total -0.23 = L/92 0.23 = L/90 in 0.97 <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 />2109 W Flora St <br />01/27/23