Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Anti-collapse performance assessment of steel beam-column substructures with all-welded connections after exposure to fire
Abstract This paper presents both the experimental and numerical studies on the collapse resistance of beam-column substructures with all-welded connections under a middle-column removal scenario induced by fire scenarios. Extensive structural responses and key failure phenomena of specimens were monitored and recorded during push-down tests. The collapse resistance of specimens after exposure to fire deteriorated by comparison with those without fire exposure. In general, as the fire temperatures rose, the potentials of bending mechanisms against the progressive collapse were gradually degenerated, and the corresponding potentials of catenary mechanisms were strengthened instead. Nevertheless, the effect of temperature durations on the development history of resistance mechanisms was almost negligible. Additionally, an abundance of elaborated numerical models that considers the damage and fracture of ductile metals was developed to understand the structural responses of post-fire specimens. The simulated results showed that the vertical capacity and deformability of post-fire specimens were greatly enhanced with increasing beam heights. The span-to-depth ratios intrinsically influenced the contribution proportions of resistance mechanisms in beam-column substructures. With increased span-to-depth ratios, the vertical capacity provided by the bending mechanisms decreased obviously and deactivated works in the early stage, whereas that provided by the catenary mechanisms entered the stages of rapid development. Furthermore, two typical strengthening solutions after the fire events for post-fire substructures were comprehensively compared in terms of the structural behaviors against progressive collapse. From a practical viewpoint, strengthening with welded ribbed plates was considered a superior solution for the post-fire all-welded connections.
Highlights Anti-collapse performance of post-fire substructures was assessed. Specimen parameters included fire temperatures and fire durations. Simulated results obtained by explicit dynamic approach correlated well with the test results. Strengthening with welded ribbed plates was a superior solution for the post-fire substructures.
Anti-collapse performance assessment of steel beam-column substructures with all-welded connections after exposure to fire
Abstract This paper presents both the experimental and numerical studies on the collapse resistance of beam-column substructures with all-welded connections under a middle-column removal scenario induced by fire scenarios. Extensive structural responses and key failure phenomena of specimens were monitored and recorded during push-down tests. The collapse resistance of specimens after exposure to fire deteriorated by comparison with those without fire exposure. In general, as the fire temperatures rose, the potentials of bending mechanisms against the progressive collapse were gradually degenerated, and the corresponding potentials of catenary mechanisms were strengthened instead. Nevertheless, the effect of temperature durations on the development history of resistance mechanisms was almost negligible. Additionally, an abundance of elaborated numerical models that considers the damage and fracture of ductile metals was developed to understand the structural responses of post-fire specimens. The simulated results showed that the vertical capacity and deformability of post-fire specimens were greatly enhanced with increasing beam heights. The span-to-depth ratios intrinsically influenced the contribution proportions of resistance mechanisms in beam-column substructures. With increased span-to-depth ratios, the vertical capacity provided by the bending mechanisms decreased obviously and deactivated works in the early stage, whereas that provided by the catenary mechanisms entered the stages of rapid development. Furthermore, two typical strengthening solutions after the fire events for post-fire substructures were comprehensively compared in terms of the structural behaviors against progressive collapse. From a practical viewpoint, strengthening with welded ribbed plates was considered a superior solution for the post-fire all-welded connections.
Highlights Anti-collapse performance of post-fire substructures was assessed. Specimen parameters included fire temperatures and fire durations. Simulated results obtained by explicit dynamic approach correlated well with the test results. Strengthening with welded ribbed plates was a superior solution for the post-fire substructures.
Anti-collapse performance assessment of steel beam-column substructures with all-welded connections after exposure to fire
Guo, Zhan (Autor:in) / Xing, Zhiquan (Autor:in) / Zhang, Heng (Autor:in) / Zhang, Hanwu (Autor:in) / Chen, Long (Autor:in) / Chen, Yu (Autor:in)
02.08.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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