COLLAPSE RESISTANCE CALCULATION WITH DIFFERENT STIFFNESS CONNECTIONS BASED ON THE COMPONENT METHOD

The collapse performance of steel frames generally depends on their ability to resist local damage. However, this ability is decided by the connection behavior, which has not been determined methodically and reliably. Thus, developing a simplified connection model for predicting the structural collapse resistance is critical for preventing progressive collapse. In this study, component models were constructed with different stiffness connections, including the double web angle (DWA), top-seat with double web angle (TSDWA), and welded flange-bolted web (WUF) connections, according to the component method by simplifying its geometry and dividing it into several basic springs. The proposed component-based connection models with detailed components were implemented within the finite element program, ANSYS. The models were validated against previous experimental tests. The analysis results indicate that the component models can accurately reflect the load response and post-fracture path of the assemblies with a cost-effective solution. This indicates that the component method is significant for progressive collapse analysis, providing a simple and effective tool for designers and engineers to evaluate the load-resisting capacities of steel frame structures.