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Seismic demand on steel reinforcing bars in reinforced concrete frame structures

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Abstract

Modern design standards for reinforced concrete (r.c.) buildings allow the achievement of ductile structures, able to globally dissipate seismic energy through the development of plastic deformations located in the dissipative regions (i.e. plastic hinges). The hysteretic capacity of r.c. structures is related to the ability of reinforcing steel bars to sustain many cycles of high plastic deformations without the exhibition significant decrease of strength and stiffness; this condition, typically due to cyclic/seismic action, shall be widely investigated in order to obtain a full and detailed knowledge of the structural behaviour of modern r.c. buildings. In the present paper, elaborated inside the European research project “Rusteel”, the evaluation of the seismic ductile demand on steel reinforcing bars due to real earthquake events was carried out. Representative r.c. case study buildings were designed following the actual European and Italian prescriptions and analyzed using the Incremental Dynamic Analysis technique for the assessment of the behaviour under real seismic events. The elaboration of a simplified mechanical model for the steel reinforcing bars, calibrated on the basis of experimental monotonic and cyclic tests, allowed the evaluation of the effective level of deformation and energy dissipation required by earthquakes and the assessment of the ability of the actual European production to satisfy the effective seismic ductile requirements.

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Acknowledgments

The present work was developed inside the European Research Project RUSTEEL (RFSR-CT-2009-00023), funded by the Research Fund for Coal and Steel (RFCS). The authors would like to thank all the partners involved in the project for their contributions.

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Authors and Affiliations

  1. Thy Marcinelle—Rivagroup, Rue de l’Acier, BP 1002, Charleroi 1, 6000 , Charleroi, Belgium

    A. Braconi

  2. Department of Structural and Geotechnical Engineering, University La Sapienza, Roma Via Eudossiana 18, 00198 , Roma, Italy

    F. Braga & R. Gigliotti

  3. Department of Civil and Industrial Engineering, University of Pisa, Largo L. Lazzarino 1, 56126 , Pisa, Italy

    S. Caprili & W. Salvatore

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  1. A. Braconi
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  2. F. Braga
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  4. R. Gigliotti
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  5. W. Salvatore
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Correspondence to S. Caprili.

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Braconi, A., Braga, F., Caprili, S. et al. Seismic demand on steel reinforcing bars in reinforced concrete frame structures. Bull Earthquake Eng 12, 2633–2664 (2014). https://doi.org/10.1007/s10518-014-9596-y

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