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12 of 12 <br /> Project No.: Sheet No.: <br /> DIBBLE ENGINEERS, INC. >0(-x)o( )o(x <br /> Project: Date: <br /> xxx 9/20/2022 <br /> Subject: By: <br /> Stair Stringer Schedule Calculations xxx <br /> Codes Used: 2015 IBC,2015 NDS&Supplement,ASD Methods <br /> Lumber Material Properties: Douglas Fir Larch-No.2 <br /> (Reference Bending Stress per NDS Table 4A) <br /> Fb= 900 psi <br /> F�= 180 psi (Reference Shear Stress per NDS Table 4A) <br /> E= 1,600,000 psi (Reference Modulus of Elasticity per NDS Table 4A) <br /> Lumber Adjustment Factors: <br /> Co= 1.00 (Floor Live) CF= (Dimension Specific) <br /> Cm(Fb)= 1.00 (Dry) CA,= 1.00 (Not Flat Use) <br /> Cm(F�)= 1.00 (Dry) G(Fb,)= 1.00 (Not Incised) <br /> Cm(E)= 1.00 (Dry) G(E)= 1.00 (Not Incised) <br /> G= 1.00 (T< 100*F) G= 1.15 (Repetitive) <br /> C,= 1.00 (Laterally Supported) <br /> Lumber Adjusted Material Properties: <br /> F'b= Fb*Co*G.,*G*CL CF*C�,*C,*Cr (Per NDS Table 4.3.1) <br /> 1035 psi *CF (Design Bending Stress-Cr not yet applied) <br /> F',= F,*Co*C"*G*G (Per NDS Table 4.3.1) <br /> 180 psi (Design Shear Stress) <br /> E'= E *Cin*G*G (Per NDS Table 4.3.1) <br /> 1,600,000 psi (Design Modulus of Elasticity) <br /> Lumber Member Properties: <br /> Nominal Dimensions CF A Sx I, E'Ix Mallow Vanow <br /> Z (kips) <br /> Member bin d in in n " ' <br /> 2x6 1 1.5 1 5.25 1 1.3 7.875 6.891 18.088 28.941 9.27 0.95 <br /> 2)2x6 3 5.5 1.3 16.5 15.125 41.594 66.550 20.35 1.98 <br /> 4x6 3.5 1 5.5 1 1.3 19.25 17.646 48.526 77.642 1 23.74 2.31 <br /> LVL Member Properties: Per MFR <br /> Nominal Dimensions E Ix Mallow Vanow E Ix Mallow Vanow <br /> Member bin d in ksi in" ft-Ibs Ibs ksi*in"x10' ki in ki s <br /> LVL 1.75x5.5 1.75 5.5 2,000 24 2125.00 1830.00 48.000 25.50 1.83 <br /> (2)LVL 1.75x5.5 3.5 5.5 2,000 48 4250.00 3660.00 96.000 51.00 3.66 <br /> 3 LVL 1.75x5.5 5.25 1 5.5 2,000 1 72 6375.00 5490.00 1 144.000 1 76.50 5.49 <br /> Stringer Design: <br /> LL= 100 psf (Live Load) <br /> DL= 15 psf (Dead Load; <br /> Total = 115 psf (Total Load) <br /> Length Spacing Mnmx VMAX E16-w o(ru EIA-uno(LL) Check M Check V Check El, <br /> ft ft ki -in ki s ksi*in"x10' ksi*in4X103 % %) %) <br /> 2x6 r6.3 1.34 9.271 0.488 17.615 22.976 100% 52% 79%LVL 1.75x .34 9(2)2x6 1.34 18.663 0.692 50,310 65.621 92% 35% 99% <br /> 4x6 1.34 20.681 0.729 58.685 76.546 87% 32% 99% <br /> (2)LVL 1.75x5.5 1.34 23.821 0.782 72.546 94.625 47% 21% 99% <br /> 3 LVL 1.75x5.5 1.34 31.206 0.895 108.775 141.881 41% 16% 99% <br /> 2x6 1.33 1.00 9.271 0.422 20.391 26.597 100% 45% 92% <br /> LVL 1.75x5.5 8.88 1.00 13.615 0.511 36.288 47.332 53% 280/. 99% <br /> (2)2x6 9.91 1.00 16.925 0.570 50.295 65.602 83% 29% 99% <br /> 46 10.43 1.00 18.755 0.600 58.668 76.524 790/. 260/. 99% <br /> (2)LVL 1.75x5.5 11.19 1.00 21.603 0.643 72.525 94.598 42% 18% 99% <br /> 3 LVL 1.75x5.5 12.81 1.00 28.300 0.736 108. 443 141.839 37% 1 13% 1 98% <br />