Sg. Winistorfer, NAILED CONSTRUCTION - A COMPARISON OF 1986 AND 1991 NATIONAL DESIGN SPECIFICATION METHODS, Transactions of the ASAE, 37(2), 1994, pp. 603-610
The National Design Specification (NDS) for Wood Construction publishe
d by the American Forest and Paper Association (AFPA) is the primary g
uide used in designing timber structures in the United States. This ar
ticle compares the lateral and withdrawal nail design methods in the 1
991 NDS to those in the 1986 NDS. A lateral nail design example is inc
luded for illustration. Design method changes from the 1986 to the 199
1 NDS include (a) using a lateral design format that is based on theor
etical yield limit equations, (b) reducing annularly threaded nail lat
eral design values about 25% from those in the 1986 NDS when threads o
ccur at the shear plane, (c) increasing the load duration factor for w
ind and earthquake to 1.6 compared to 1.33 in the 1986 NDS, and (d) el
iminating the 1986 NDS increases in allowable stress for cold temperat
ure conditions.