Calculate Bending Member Flexure Strength for Wood

The following is for calculating the adjusted moment capacity of a wood member.

Reference design value for bending (Fb)

*Section modulus of member (S)

Load duration factor (Cd)

Wet service factor (Cm)

Temperature factor (Ct)

Incising factor (Ci)

Beam stability factor (CL)

Size factor (Cf)

Flat use factor (Cfu)

Repetitive member factor (Cr)

Time effect factor (TEF)

Result

ASD the adjusted moment, M'

in-lbs

LRFD the adjusted moment, M'

in-lbs

Fb - Reference design value for bending
S - *Section modulus of member
Cd - Load duration factor
Cm - Wet service factor
Ct - Temperature factor
Ci - Incising factor
CL - Beam stability factor
Cf - Size factor
Cfu - Flat use factor
Cr - Repetitive member factor
TEF - Time effect factor
*For a rectangular bending member with neutral access perpendicular to depth at the center, Section modulus, S = (bd^2)/6;
b = width, d = depth
M'(ASD) - the adjusted moment
M'(LRFD) - the adjusted moment