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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 : 3 - HDR @ LIVING ROOM <br />Loads(Downward+) <br />Beam Weight 11.9 plf from 0 ft to 8.25 ft <br />Exterior Wall: (15)(2) = (DL=30PLF) form 0 to 8.25 <br />Point load @ 3 : Load from beam 1 at Support 1(P1) <br />Reactions (D+Lr+L/Max. Load comb.) <br />Bearing Down Up <br />1 3860/3861 0 <br />2 2280/2280 0 <br />USE 3 1/2" x 11 7/8" LSL <br />Critcal Shear = 3860 LB @0' 1.5xV/(F'v x A)= 0.36 <br />F'v = 388, A = 41.56 <br />Critcal Moment = 11393 LB-FT @3' M/(F'b x S)= 0.57 <br />F'b = 2906, S = 82.26 <br /> Critical Deflection for TL = -0.15 INCH @ 3.75 L/240 = 0.412" <br /> Critical Deflection for LL = -0.063 INCH @ 3.75 L/360 = 0.275" <br />1 2 <br />P1 <br />Moment <br />Shear <br />Deflection <br />8.25' <br />BEAM : 4 - HDR @ LIVING ROOM <br />Loads(Downward+) <br />Beam Weight 6.2 plf from 0 ft to 6.25 ft <br />Exterior Wall: (15)(2) = (DL=30PLF) form 0 to 6.25 <br />Point load @ 1.25 : Load from beam 2 at Support 2(P1) <br />Reactions (D+Lr+L/Max. Load comb.) <br />Bearing Down Up <br />1 2352/2352 0 <br />2 673/673 0 <br />USE 4 x 8 <br />Critcal Shear = 2352 LB @0' 1.5xV/(F'v x A)= 0.61 <br />F'v = 225, A = 25.38 <br />Critcal Moment = 2911 LB-FT @1.25' M/(F'b x S)= 0.78 <br />F'b = 1462, S = 30.66 <br /> Critical Deflection for TL = -0.09 INCH @ 2.75 L/240 = 0.312" <br /> Critical Deflection for LL = -0.041 INCH @ 2.75 L/360 = 0.208" <br />1 2 <br />P1 <br />Moment <br />Shear <br />Deflection <br />6.25' <br />20 of 26