Component‐Based Modeling of Steel–Concrete Composite Endplate Connections Under Fire Conditions

In fire scenarios, the performance of connections in composite structures differs significantly from that in noncomposite steel structures. To accurately simulate the high‐temperature behavior of composite endplate connections, a component‐based model has been developed and integrated into the Vulcan software. This model includes a reinforcement component that considers the pull‐out of longitudinal rebars across a concrete crack above the connection, as well as the influence of physical anchorages, provided by the weld points in the mesh, on the total slip of the rebars. To validate the proposed connection model, a typical composite fire compartment with end‐plate connections has been modelled using both Abaqus and Vulcan. Comparison results demonstrate that the component‐based model developed in this work can effectively capture the high‐temperature performance of composite endplate connections under fire conditions.