Adjusted Bending Design Value Summary

 

For general bending,

F'_b = F_b(C_D)(C_M)(C_t)(C_L)(C_F or C_V)(C_fu)(C_c)(C_i)(C_r)
F'_bn = F_bK_F(Φ_b)(λ)(C_M)(C_t)(C_L)(C_F or C_V)(C_fu)(C_c)(C_i)(C_r)

CD	load duration factor (ASD only)
KF	format conversion factor (LRFD only)
Φ	resistance factor (LRFD only)
λ	time effect factor (LRFD only)
CM	wet service factor
Ct	temperature factor
CL	beam stability factor
CF	size factor
CV	volume factor
Cfu	flat use factor
Cc	curvature factor
Ci	incising factor
Cr	repetitive member factor
CP	column stability factor

 

For visually graded sawn lumber about strong axis,

F'_bx = F_bx(C_D)(C_M)(C_t)(C_L)(C_F or C_V)(C_fu)(C_c)(C_i)(C_r)
F'_bxn = F_bxK_F(Φ_b)(λ)(C_M)(C_t)(C_L)(C_F or C_V)(C_fu)(C_c)(C_i)(C_r)

 

For visually graded sawn lumber about weak axis,

F'_by = F_by(C_D)(C_M)(C_t)(C_L)(C_F or C_V)(C_fu)(C_c)(C_i)(C_r)
F'_byn = F_byK_F(Φ_b)(λ)(C_M)(C_t)(C_L)(C_F or C_V)(C_fu)(C_c)(C_i)(C_r)

 

For glulams,

C_V and C_L are not to be used together

C_V adjusts for tension zone
C_L adjusts for compression zone

 

For glulams with tension lams in tension,

F⁺'_bx = smaller of F⁺_bx(C_D)(C_M)(C_t)(C_L)(C_F or C_V)(C_fu)(C_c)(C_i)(C_r) or F⁺_bx(C_D)(C_M)(C_t)(C_L)(C_F or C_V)(C_fu)(C_c)(C_i)(C_r)
F⁺'_bxn = smaller of F⁺_bxK_F(Φ_b)(λ)(C_M)(C_t)(C_L)(C_F or C_V)(C_fu)(C_c)(C_i)(C_r) or F⁺_bxK_F(Φ_b)(λ)(C_M)(C_t)(C_L)(C_F or C_V)(C_fu)(C_c)(C_i)(C_r)

 

For glulams with tension lams in compression,

F^-'_bx = smaller of F^-_bx(C_D)(C_M)(C_t)(C_L)(C_F or C_V)(C_fu)(C_c)(C_i)(C_r) or F^-_bx(C_D)(C_M)(C_t)(C_L)(C_F or C_V)(C_fu)(C_c)(C_i)(C_r)
F^-'_bxn = smaller of F^-_bxK_F(Φ_b)(λ)(C_M)(C_t)(C_L)(C_F or C_V)(C_fu)(C_c)(C_i)(C_r) or F^-_bxK_F(Φ_b)(λ)(C_M)(C_t)(C_L)(C_F or C_V)(C_fu)(C_c)(C_i)(C_r)