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American Wood Council
TR 12 - General Dowel Equations for Calculating Lateral Connection Values (2014)

3​6 pages (1.​41 MB PDF)

The yield limit equations specified in the National Design Specification® (NDS®) for Wood Construction for bolt, lag screw, wood screw, nail, spike and drift pin connections represent a mechanics-based approach for connection design. This approach, which was incorporated in the 1991 NDS, permits the designer to determine effects of member thickness, member strength, fastener size, and fastener strength on lateral connection values for the majority of connections found in wood construction. This report covers calculation of lateral values for single dowel type fastener connections using a generalized and expanded form of the NDS yield limit equations. These general dowel equations apply to NDS connection conditions, but also provide tools for the analysis of gaps between members, various fastener moment resistance configurations, fasteners through hollow members, and fasteners with tapered tips.

TR 12 Online Courses
  • DES330 – Design of Connections for Wood Members using the NDS and TR12

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