PSI - Issue 64

Sabatino Di Benedetto et al. / Procedia Structural Integrity 64 (2024) 983–990 S. Di Benedetto / Structural Integrity Procedia 00 (2019) 000 – 000

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5. Conclusions This paper presents the findings of a study aimed at assessing the seismic vulnerability of an existing two-storey steel structure situated in Avellino (Italy). Constructed in the early 1980s, when seismic code requirements were less stringent, the structure comprises pinned frames for gravity loads and CBFs to resist seismic and wind forces. However, the current bracings are deemed inadequate for withstanding the design seismic actions, resulting in a Seismic Risk Class D classification. In response to this deficiency, retrofit measures have been conceived, involving the implementation of innovative aluminium foam dampers within the bracing system. These dampers are capable of providing the necessary tensile resistance to the bracing by compressing the internal foam core. The retrofit intervention also necessitated the replacement of the bracings, modifications to nodal details, and the creation of embedded column bases. Through the use of aluminium foam dampers, the building has been fully retrofitted, enabling it to achieve a Seismic Risk Class of up to A. Acknowledgements The research is framed within the Laboratories University Network of Seismic Engineering, project ReLUIS 2022-24 from the Italian Civil Protection Department. Moreover, the authors would like to express their gratitude to Dr. Eng. Fabio Iannone and Dr. Eng. Carmine Lima for their support. References Cantisani, G., Della Corte, G., 2022. Modelling and Seismic Response Analysis of Non-residential Existing Steel Buildings in Italy. Journal of Earthquake Engineering. 27. 10.1080/13632469.2022.2030438. Cantisani, G., Della Corte, G., 2022. Collapse Fragility Curves for Non-residential Older Single-Storey Steel Buildings. 10.1007/978-3-031 03811-2_44. C.E.N. (European Committee for Normalisation), 2004. EN1998 - 1 Eurocode 8: Design of structures for earthquake resistance – Part 1: General Rules, Seismic Actions and Rules for Buildings. C.S.LL.PP. (Italian Commission for Public Works), 2019. Circ. 21/01/2019: “Istruzioni per l’applicazione dell’«Aggiornamento delle Norme tecniche per le costruzioni” [in Italian]. CSI, 2021. SAP2000 v.23 User’s Manual. de la Peña, A., Sato, A., Latour, M., Rizzano, G., 2023, Conceptual design of anti - seismic devices with metal foam core for CBFs. Procedia Structural Integrity. 44. 2144 - 2151. 10.1016/j.prostr.2023.01.274. Ferrante Cavallaro, G., Francavilla, A. B., Latour, M., Piluso, V., Rizzano, G., 2017. Experimental behaviour of innovative thermal spray coating. Composites Part B: Engineering Volume 115, 289 - 299. Istat, 2001. 14° censimento della popolazione e delle abitazioni. https://www.istat.it/it/censimenti-permanenti/censimenti-precedenti/popolazione e-abitazioni/popolazione-2001. Mazzolani, F., Della Corte, G., Cantisani, G., 2022. Seismic Upgrading of an Existing Steel Structure Using Inverted Y-braces. 10.1007/978-3 031-03811-2_98. Milone, A., Tartaglia, R., D'Aniello, M., Landolfo, R., 2022. Seismic Assessment and Strengthening of an Existing Non‐Conforming Multi‐ Storey Steel Building. ce/papers. 5. 701 - 707. 10.1002/cepa.1809. Milone, A., 2023. Seismic assessment and retrofitting of a non - conforming CBF structure. 300003. 10.1063/5.0162261. Ministero delle infrastrutture e dei trasporti, D.M. 28 febbraio 2017, n. 58 recante: “Sisma Bonus - Linee guida per la classificazione del rischio sismico delle costruzioni nonché le modalità per l’attestazione, da parte di professionisti abilitati, dell’efficacia degli interventi effettuati”, vol. 380, no. 2, pp. 4–6, 2017. M.I.T. (Italian Ministry for Infrastructures and Transportations), 2018. D.M. 17/01/2018: Aggiornamento delle “Norme Tecniche per le Costruzioni” [in Italian]. Moradi, M., 2011. Structural applications of metal foams considering material and geo - metrical uncertainty. PhD Thesis, University of Massachusetts Amherst. Moradi, M., Arwade, S.R., 2014. Structural Engineering Mechanics. 51(6): 1017 - 1036. Tartaglia, R., Milone, A., Prota, A., Landolfo, R., 2022. Seismic Retrofitting of Existing Industrial Steel Buildings: A Case-Study. Materials. 15. 3276. 10.3390/ma15093276. Tartaglia, R., Prota, A., Milone, A., Di Lorenzo, G., Landolfo, R., 2022. Seismic Assessment and Strengthening of an Existing Industrial Building. 10.1007/978 - 3 - 031 - 03811 - 2_107. Zuccaro, G., Dolce, M., Perelli, F.L., De Gregorio, D., Speranza, E., 2023. CARTIS: a method for the typological-structural characterization of Italian ordinary buildings in urban are-as. Frontiers in Built Environment 9, https://www.frontiersin.org/articles/10.3389/fbuil.2023.1129176.