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Dong Engineering Inc. <br />REMODEL & ADDITION <br />1409 MERIDAY LN, SANTA ANA, CA 92706 <br />Job #: 250344 <br />Date : 08/18/2025 <br />Plan : 1 <br />BEAM : R2 - R.R. 2X6 DFL#2 @ 16" O.C. <br />Loads(Downward+) <br />Roof Rafter: (14+20)(1.3) = (DL=18.7PLF; LLr=26.7PLF) form 0 to 15.75 <br />Reactions (D+Lr+L/Max. Load comb.) <br />Bearing Down Up <br />1 151/151 0 <br />2 447/448 0 <br />3 116/116 0 <br />USE 2 x 6 <br />Critcal Shear = -234 LB @8.5' 1.5xV/(F'v x A)= 0.19 <br />F'v = 225, A = 8.25 <br />Critcal Moment = -352 LB-FT @8.5' M/(F'b x S)= 0.33 <br />F'b = 1682, S = 7.56 <br /> Critical Deflection for TL = -0.082 INCH @ 3.75 L/240 = 0.425" <br /> Critical Deflection for LL = -0.048 INCH @ 3.75 L/360 = 0.283" <br />1 2 3 <br />Moment <br />Shear <br />Deflection <br />8.5'7.25' <br />24 of 26