Finite Element Modeling of Nailed Connections in Low-Rise Residential Home Structures

Increased frequency and intensity of coastal storms as well as the restructuring of flood insurance policies has renewed interest in the structural performance of coastal residential homes under wind, flooding and storm surge hazards. Varying construction techniques and environmental deterioration often results in nailed connections that are weaker than the structural members they join. Therefore, global performance of light framed residential structures is found to be greatly dependent on the performance of individual connections. Nonlinear behavior of these connections could further complicate accurate characterization of the connection response in the structural system. Traditional finite element approaches such as using multiple nonlinear springs to define directional stiffness often neglect the coupling effects of the multidirectional connection response. Furthermore, the implementation of nonlinear spring connector elements along the corners and edges of a structure could be difficult and time consuming for the user since additional nodes or elements and coupling functions have to be built or used in the modeling process. In the present study, an innovative connection modeling scheme is proposed to model nailed connections using an equivalent beam element. Experimental data and a nonlinear material model is used to define a single parameterized beam element to represent a connection between structural members. The parameterized beam element retains an intrinsic coordinate system for ease of meshing and couples the axial and transverse connection response for a more conservative displacement solution.