beam inertia calc

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Moment of Inertia Calculations Combined Plate and Stiffener Width Height Area y-bar Product b h a Member/Part (in) (in) (in) Stiffener Flange (bf, tf) 7.6 0.5 3.800 6.750 25.650 Stiffener Web (tw, d) 0.375 6 2.250 3.500 7.875 Plating (s, tp) 9 0.5 .500 0.250 !.!25 S"#s $ !0.550 3.650 %rea $ !0.550 &eig't $ &eig't f % $ 3.28 in S* + p $ *#ent f nertia ab"t % () $ 9.!0! S* -tt# $ -ending *#ent !756 ftlb /'e1 % ert !76 972 in l b -ending Stresstp 69869psi -ending Stress btt# 6!759 psi *a4 bending stress 69869 ield Stress 80000 psi Fatr f Safet !.!5 d bl ad bl (in 2 ) (in 3 ) in 2 in 4

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Sheet1Moment of Inertia CalculationsCombined Plate and StiffenerWidthHeightAreay-barProduct2nd ProductLocal ibhadbladbladbl2bh3/12Member/Part(in)(in)(in2)(in)(in3)(in4)(in4)Stiffener Flange (bf, tf)7.60.53.8006.75025.650173.1380.079Stiffener Web (tw, d)0.37562.2503.5007.87527.5636.750Plating (s, tp)90.54.5000.2501.1250.2810.094Sums =10.55034.650200.9816.923Area =10.550in2Height =7inHeight of NA =3.284inSM Top =25.326in3Moment of Inertia about NA (I) =94.101in4SM Bottom =28.651in3Bending Moment147456ft-lbCheck NA % Vert47%1769472in-lbBending Stress-top69869psiBending Stress - bottom61759psiMax bending stress69869Yield Stress80000psiFactor of Safety1.15

bfsdtftwt

Sheet2

Sheet3

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