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American Wood Council

What is the purpose of the NDS Format Conversion Factor, KF?

The NDS Format Conversion Factor, KF , converts reference design values (allowable stress design values based on normal load duration) to LRFD reference resistances as described in ASTM D5457 Standard Specification for Computing Reference Resistance of Wood-Based Materials and Structural Connections for Load and Resistance Factor Design. The expression for KF is a constant divided by the resistance factor, f, and includes the following:

  1. a conversion factor to adjust an allowable design value to a strength level design value (embedded in the constant), 
  2. a conversion factor to adjust from a 10 year (long-term) load duration to a 10 minute (short-term) load duration basis (embedded in the constant), and 
  3. a conversion factor to adjust for a specified resistance factor, f (expressed independently in the denominator)

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