When designing a wood/steel section(beam) with flitch plate, is it reasonable to determine a "transformed" Allowable Bending Stress, Fb, by reason of propotionality?
i.e.
A 4-ply 2x12 SYP #1 (Fb=1,062 psi)(wet-service adjusted)
w/1-ply A36 0.25x11 (Fb=21,600 psi)
A(SYP)=67.5 si
A(A36)=2.75 si
A(combined)=70.25 si
Therefore:
Fb(SYP)=(67.5/70.25)1,062=1,019 psi
Fb(A36)=(2.75/70.25)21,600=864 psi
Fb(combined)=1,019+864=1,883 psi
Please advise... Thank you...
i.e.
A 4-ply 2x12 SYP #1 (Fb=1,062 psi)(wet-service adjusted)
w/1-ply A36 0.25x11 (Fb=21,600 psi)
A(SYP)=67.5 si
A(A36)=2.75 si
A(combined)=70.25 si
Therefore:
Fb(SYP)=(67.5/70.25)1,062=1,019 psi
Fb(A36)=(2.75/70.25)21,600=864 psi
Fb(combined)=1,019+864=1,883 psi
Please advise... Thank you...