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Dong Engineering Inc. <br />ADU <br />3414 S_TIMBER ST, SANTA ANA, CA 92707 <br />Job #: 250421 <br />Date : 09/17/2025 <br />Plan : 1 <br />BEAM : R1 - R.R. 2 X 6 DFL#2 @ 16" O.C. <br />Loads(Downward+) <br />Roof Rafter: (14+20)(1.3) = (DL=18.7PLF; LLr=26.7PLF) form 0 to 11.75 <br />Reactions (D+Lr+L/Max. Load comb.) <br />Bearing Down Up <br />1 267/267 0 <br />2 267/267 0 <br />USE 2 x 6 <br />Critcal Shear = 266 LB @0' 1.5xV/(F'v x A)= 0.21 <br />F'v = 225, A = 8.25 <br />Critcal Moment = 783 LB-FT @5.75' M/(F'b x S)= 0.74 <br />F'b = 1682, S = 7.56 <br /> Critical Deflection for TL = -0.585 INCH @ 5.75 L/240 = 0.588" <br /> Critical Deflection for LL = -0.344 INCH @ 5.75 L/360 = 0.392" <br />1 2 <br />Moment <br />Shear <br />Deflection <br />11.75' <br />BEAM : R2 - R.R. 2 X 6 DFL#2 @ 16" O.C. <br />Loads(Downward+) <br />Roof Rafter: (14+20)(1.3) = (DL=18.7PLF; LLr=26.7PLF) form 0 to 12.75 <br />Reactions (D+Lr+L/Max. Load comb.) <br />Bearing Down Up <br />1 -44/0 -18 <br />2 448/448 0 <br />3 175/175 0 <br />USE 2 x 6 <br />Critcal Shear = 256 LB @3.25' 1.5xV/(F'v x A)= 0.2 <br />F'v = 225, A = 8.25 <br />Critcal Moment = -384 LB-FT @3.25' M/(F'b x S)= 0.36 <br />F'b = 1682, S = 7.56 <br /> Critical Deflection for TL = -0.136 INCH @ 8.5 L/240 = 0.475" <br /> Critical Deflection for LL = -0.08 INCH @ 8.5 L/360 = 0.317" <br />1 2 3 <br />Moment <br />Shear <br />Deflection <br />3.25'9.5' <br />24 of 32