CIRCOMP reversible shear connection for steel‐timber composite beams: short‐ and long‐term behavior

Abstract

Steel–timber composite (STC) structures have gained increasing attention over the past decade, particularly for floor systems in steel buildings. The shear connection between engineered wood product (EWP) panels, such as cross‐laminated timber (CLT), and steel beams is crucial for achieving effective composite action. In recent years, significant research efforts have focused on the development of shear connections for STC systems, with dowel‐type fasteners (e.g., bolts or screws) being the most adopted solution. Although these connections are simple to assemble, they typically exhibit relatively low stiffness, which limits the efficiency of composite action. This paper presents a newly developed reversible shear connection, investigated within the framework of the FWO‐funded CIRCOMP project. In contrast to conventional dowel‐type connections, the proposed system is based on an alternative load‐transfer mechanism and integrates design‐for‐disassembly principles to facilitate the circular use of STC beams. The mechanical behavior of the connection is evaluated through push‐out tests under both short‐term and long‐term loading conditions. In addition, an analytical component‐based model is developed to predict the connection response in terms of strength and stiffness. Finally, the performance of the proposed connection is benchmarked against traditional dowel‐type solutions to assess its efficiency.