Fuse‐Based Segmentation in Steel Frame Structures: Preliminary Results from a Full‐Scale Collapse Test

Abstract

The increasing exposure of buildings to extreme actions highlights the need for structural systems capable of sustaining localised damage without disproportionate collapse. This is particularly important for steel buildings, where high continuity may increase the risk of progressive collapse. While robustness design approaches based on alternative load paths are effective for limited damage scenarios, their effectiveness may decrease under larger initial failures. The Fuse‐based Segmentation (FBS) philosophy is proposed as an effective design strategy. This approach aims to protect the undamaged sections of a structure by enabling controlled separation of damaged regions under extreme events. A full‐scale two‐storey steel building with hollow‐core concrete slabs, designed in accordance with Eurocodes, is presented. The structure incorporates strong borders and force‐limiting elements to manage force transfer and mitigate damage propagation, while preserving normal behaviour under service conditions. The structural response is evaluated through an experimental program based on column removal scenarios. Preliminary results indicate that FBS approach promotes natural structural segmentation during severe failures, arresting collapse propagation and preserving global stability.