Modeling The Nonlinear Moment-Rotation Relationship Of A Nail Plate Connector1

Vladimir G. Kochkin, Joseph R. Loferski


This paper presents a mechanics-based procedure for modeling the nonlinear moment resistance of multiple-dowel wood connections. The lack of a consistent methodology for predicting rotational resistance of multiple-dowel joints was identified as one of the barriers to adoption of a ready-to-assemble (RTA) wood framing system. Integral to the RTA system is a nail plate connector (NPC) that consists of a metal plate with multiple dowel and is used to assemble RTA framing members into complete structural systems. The principle of energy conservation is used to derive the model. The proposed procedure is formulated such that the nonlinear response of the nails and plate bearing are explicitly included in the model to accurately predict the moment-rotation relationship over a wide range of deformations. Therefore, the model provides the information on both the ultimate strength and deformation capacity needed to establish safety margins and to perform serviceability checks, respectively. The method requires input of the lateral load-displacement relationships for an individual nail and plate bearing on the end grain of wood framing member. These relationships can be readily measured using lateral test procedures or determined analytically. The formulation showed excellent correlation with test results (R2 = 0.98). The proposed model presents an engineering and research tool and has the potential to promote the use of timber frames assembled with multiple dowel joints.


Timber connectors;nail plate connector;timber engineering;moment rotation;nonlinear modeling;wood;ready to assemble building system;multiple dowel joint

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