TABLE OF CONTENTS The 1991 NDS (Ref. 11.1) introduced an entirely new method for evaluating the strength of laterally loaded connections. The new method is known as the yield limit model for dowel-type fasteners, and it represents the adoption of an engineering mechanics approach to the design of wood connections. It replaces the old empirical method of predicting the capacity of many common wood fasteners.
Although the equation format of the NDS provides a well organized design specification, the move to an engineering mechanics approach for fasteners has introduced some rather complicated equations for connection design. The designer, however, has the option of applying the formulas (which is best done on a computer) or using a set of fastener capacity tables that are based on the yield limit equations.
Chapter 11 starts by introducing the common types of fasteners used in typical wood connections, and the notation system for connection design is described. Greater detail about the connections and the required adjustment factors is included in the chapters that deal with specific fasteners. The chapter concludes with a review of the general concepts of the yield limit theory. Important strength considerations are included along with a summary of the various possible yield modes that are considered in this approach to connection design.
There are a wide variety of fasteners and many different types of joint details that can be used in wood connections. When structural members are attached with fasteners or some other...
