ABSTRACT
The National Design Specifications (NDS) for wood construction of the American Forest and Paper Association provide the basic standards and specifications for various wood products. Cross-laminated timber is a new generation of engineering wood product that was introduced in the 2015 NDS as a code compliant construction material. The resistance factor, also referred to as the strength reduction factor, is used to account for all uncertainties whether related to the materials manufacturing, structural construction, or design computations that may cause actual values to be less than the theoretical values. Wood has a unique property because it can support a higher load when applied for a short duration. The nominal reference design values are representative of the short duration loading. Repetitive Member Factor is applied only to the dimension lumber and then only to the bending strength value. Bearing Area Factor is a special factor applied only to the compression reference design value perpendicular to the grain.
