Damages exhibited by reinforced concrete (RC) buildings designed before the entry into force of the modern codes pointed out the paramount role of beam-column joints. In particular, the absence of transversal steel reinforcement, together with the poor attention to structural details, resulted the main responsible for exterior beam-column joints mostly vulnerable toward horizontal seismic actions. The studies available in current literature paid particular attention to the assessment of the seismic vulnerability of RC beam-column joints and, more recently, to the development of strengthening interventions based on the use of Fiber Composite Polymer materials (FRP). The present paper is part of a research activity carried out by the Authors and finalized to develop reliable numerical models able to simulate the response of RC beam-column joints subjected to monotonic loads. In particular, the model previously proposed by the Authors for the case of RC beam-column joints without transversal steel reinforcement, a configuration typical for the majority of existing RC buildings in Italy, is here extended to the case of RC beam-column joints strengthened by FRP. The model, implemented in the OpenSees computer code, is developed and assessed with reference to RC joint specimens found in scientific papers published in literature.

Modeling Proposal for Exterior RC Beam-Column Joints Strengthened by Composite Materials

Napoli, Annalisa
Membro del Collaboration Group
;
Realfonzo, Roberto
Membro del Collaboration Group
2024

Abstract

Damages exhibited by reinforced concrete (RC) buildings designed before the entry into force of the modern codes pointed out the paramount role of beam-column joints. In particular, the absence of transversal steel reinforcement, together with the poor attention to structural details, resulted the main responsible for exterior beam-column joints mostly vulnerable toward horizontal seismic actions. The studies available in current literature paid particular attention to the assessment of the seismic vulnerability of RC beam-column joints and, more recently, to the development of strengthening interventions based on the use of Fiber Composite Polymer materials (FRP). The present paper is part of a research activity carried out by the Authors and finalized to develop reliable numerical models able to simulate the response of RC beam-column joints subjected to monotonic loads. In particular, the model previously proposed by the Authors for the case of RC beam-column joints without transversal steel reinforcement, a configuration typical for the majority of existing RC buildings in Italy, is here extended to the case of RC beam-column joints strengthened by FRP. The model, implemented in the OpenSees computer code, is developed and assessed with reference to RC joint specimens found in scientific papers published in literature.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/4901695
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