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eng.timber-beam-bending-NDS Calculator
Calculates timber beam bending stress, shear, and deflection using NDS adjustment factors for size, moisture, load duration, and stability. NDS adjustment factors can reduce tabulated bending stress by 30–50% for long-duration loads in wet conditions — these factors make timber design more complex than steel.
Inputs
Fb Psi
Internal force per unit area (Pa or MPa). Must stay below yield strength in service.
Cd
Length of time the process lasts. Ensure units are consistent with rate inputs.
Cm
A multiplier applied in the calculation.
Cf
A multiplier applied in the calculation.
S In3
Reference formula or conversion factor shown for context.
Results
adjusted bending stress F\
Internal force per unit area (Pa or MPa). Must stay below yield strength in service. Beyond yield: permanent deformation. Beyond tensile strength: fracture.
allowable moment (lb·ft)
Sample size or count used in the calculation.
allowable moment (kip·ft)
Sample size or count used in the calculation.
F\
Reference formula or conversion factor shown for context.
load duration factors
Weighted average time to receive the bond's cash flows (years). Also a price sensitivity measure: duration of 7 means a 1% rise in yields drops the bond price ~7%.