Strength and deformation characteristics of typical X-lam connections

This paper presents some of the results of an extensive experimental programme on typical X-Lam connections, conducted at CNR-IVALSA research institute. The goal of this research is to provide a better understanding of the seismic performance of connections in cross-laminated timber buildings subjected to seismic actions. In-plane monotonic and cyclic shear tests were performed on mechanical screwed connections between adjacent parallel wall-wall and floor-floor X-Lam panels. In addition, monotonic and cyclic tests were carried out on orthogonally connected panels (wall-wall and wall-floor) subjected to shear and withdrawal load. Mechanical properties in terms of strength, stiffness, energy dissipation, ductility ratio and impairment of strength were evaluated. The overstrength factor, which is of great importance in capacity-based design, was also evaluated for the different types of connection tested.