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  • Prefabricated composite beam-to-concrete filled tube or partially reinforced-concrete-encased column connections for severe seismic and fire loadings


The 'Precious' research programme has developed fundamental data, design guidelines and prequalification of two types of fire-resistant composite beam-to-column joints endowed with: (1) partially reinforced-concrete-encased columns with I-section; (2) concrete filled tubular columns with circular hollow steel section. The project has analysed, from both an analytical/numerical and an experimental standpoint, the scenario in which a fire follows an earthquake, thus defining joint typologies for which, after being damaged by an earthquake, a residual load-bearing capacity is assured during a fire occurring after an earthquake. The design has been performed in the modern context of performance-based engineering. Both interior and exterior joints with partially reinforced-concrete encased columns, i.e. type 1 joints, have been designed to be semi-rigid and partial strength, and to exhibit high ductility and limited strength deterioration under severe seismic loadings. Moreover, they have been endowed with improved details to face elevated temperatures and satisfy relevant limit states. Conversely, type 2 joints, i.e. innovative joints with concrete filled tubular columns, have been detailed to be rigid and full strength. Thus, overstrength concepts have been used to activate plastic hinges in adjacent beams for seismic loadings; improved details have also been used to face fire loadings. In order to render such solutions cost-effective from a design and industrial viewpoint, they have been conceived as prefabricated components and prequalified by means of testing. Thus, both joint types have been endowed with slabs with high ductile rebars, electrowelded meshes and electrowelded lattice girders.

Additional information

Authors: BURSI O S, University of Trento, Trento (IT);FERRARIO F, University of Trento, Trento (IT);HALLER M, Profilarbed SA, Esch-sur-Alzette (LU);LENNON T, Building Research Establishment Ltd, Watford (UK);BIANCO L, Ferriere Nord SpA, Osoppo-Udine (IT);MALLARDO R, Ferriere Nord SpA, Osoppo-Udine (IT);DEMONCEAU J F, Université de Liège, Liege (BE);FRANSSEN J M, Université de Liège, Liege (BE);JASPART J P, Université de Liège, Liege (BE);HANUS F, Université de Liège, Liege (BE);PLUMIER A, Université de Liège, Liege (BE);BAYO E, University of Navarra, Pamplona (ES);GRACIA J, University of Navarra, Pamplona (ES);ALDERIGHI E, University of Pisa, Pisa (IT);BRACONI A, University of Pisa, Pisa (IT);SALVATORE W, University of Pisa, Pisa (IT)
Bibliographic Reference: EUR 23750 EN (2009), 138 pp. Euro: 20
Availability: Katalogue Number: KI-NA-23750-EN-S The paper version can be ordered online and the PDF version downloaded at:
ISBN: ISBN: 978-92-79-11257-7
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