Diaphragm effectiveness analysis in large‐span steel‐concrete composite structures with innovative slab connectors

Abstract Steel components serving as vertical members, combined with precast concrete slabs functioning as floor systems, are increasingly employed in large industrial buildings because of their structural efficiency and construction convenience. This study examines the quasi‐static behavior of three types of slab‐to‐slab connectors, encompassing both traditional and innovative designs. Initial tests on these connectors assessed their failure modes and load‐deformation properties under various loading conditions. Subsequently, a theoretical in‐plane stiffness analysis of floor systems integrating these connectors was performed. Based on experimental data, the study further developed restoring force models for the three types of connectors. Finally, the diaphragm effectiveness of steel‐concrete composite systems incorporating precast concrete slabs was evaluated to determine the overall structural performance of large industrial buildings. The findings demonstrate that innovative connectors substantially improve the in‐plane stiffness and seismic performance of floor systems, thereby enhancing the robustness and resilience of industrial buildings.