Progressive Collapse Resistance of Steel Hollow Structural Section Columns in Moment-Resisting Frames
Volume Title: ICASGE2025
Paper ID : 1016-ICASGE-FULL
Authors
Cairo University
Abstract
Progressive collapse is a significant concern in structural engineering, occurring when the failure of a primary structural component under extreme loading initiates a chain reaction that can result in the total collapse of the structure. Therefore, this study examines the impact of using steel hollow structural section (HSS) columns in moment-resisting frames to improve a steel skeleton structure's resilience against progressive collapse. A push-down static non-linear analysis is conducted using a general-purpose finite element software on idealized structural models, including five different configurations pairing HSS sections with corresponding steel wide-flange (W) sections. The comparison focused on three key aspects: peak load capacity (arising from flexural and catenary action), ductility (measured by maximum displacement before failure), and the mode of failure. Results indicate that HSS models consistently achieve higher peak loads compared to W-section models. However, the increased stiffness of HSS sections reduces ductility, impacting their rotational capacity. Consequently, careful selection of HSS sections is recommended to balance peak load capacity with adequate rotational flexibility.
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