PSI - Issue 44

Brandonisio Giuseppe et al. / Procedia Structural Integrity 44 (2023) 1292–1299 Giuseppe Brandonisio et al. / Structural Integrity Procedia 00 (2022) 000–000

1299

8

5. Conclusion The paper discusses about the effectiveness of the “hybrid” design strategy for seismic retrofitting of an existing R.C. school building, based on a preliminary seismic vulnerability assessment. The solution merges two conceptually opposite design approach: it opts for the introduction of BIS at the base of the exiting complex, previously stiffened by connecting all different portions in a whole structure and strengthened introducing new shear walls, appropriately placed in the original structure. Concerning the technical feasibility of this hybrid solution, the proposed structural interventions appear easy in practice, without causing any kind of functional or structural limitations. In this case, the choice of connecting all the buildings at each floor level leads to avoid more complex solutions related to the retrofit of seismic joints. New shear walls, introduced in the original structure, are not intrusive, causing no closure of internal compartments. The introduction of anti-seismic devices at the base of the structure is made easier by the presence of an adequate technical clearance, considering that the extrados of the foundation system is at the depth of 1.60 m. Acknowledgements The support provided by consortium ReLUIS is acknowledged. The activities are related to the topics of WP5 “ Interventi di rapida esecuzione a basso impatto e integrati ” e and W15 “ Isolamento e dissipazione ”, included in the project DPC-ReLUIS 2019-2021. Thanks to Arch. Marianna Pedalino (Città Metropolitana di Napoli, Dirigente della Direzione Tecnica Scuole) and Arch. Annarita Marciano (Città Metropolitana di Napoli, Direzione Tecnica Scuole, Responsabile del Procedimento per l’intervento in oggetto). References Brandonisio, G., Ponzo. F., Mele, E., De Luca, A., (2017). “Prove sperimentali di isolatori elastomerici: influenza del carico verticale V e del fattore di forma secondario S2”. Atti del XVII Convegno ANIDIS. Brandonisio, G., Guidi, L.G., De Luca, A. (2019). “Stability evaluation for rubber bearings: code requirements and comparison with experimental results”, Atti del XVIII Convegno ANIDIS. CSI-Italia Srl. (2021). SAP2000 vers. 23 – Manuale. Calvi GM, Pinho R, Magenes G, Bommer JJ, Restrepo-Vélez LF, Crowley H (2006) Development of seismic vulnerability assessment methodologies over the past 30 years. ISET J Earthq Technol Paper No 472 43(3):75–104. De Luca, A., Mele, E., Molina, J., Verzeletti, G., and Pinto, A. V. (2001). Base isolation for retrofitting historic buildings: evaluation of seismic performance through experimental investigation. Earthquake Eng. Struct. Dynam. 30, 1125–1145. doi: 10.1002/eqe.54. De Luca A, Brandonisio G, Luongo S, De Martino A, Mautone G, De Stefano G, D'Onofrio G (2015). Una soluzione tutta gomma per l ’ isolamento di una struttura esistente in c.a.: le “ strutture di trasferimento ” . Atti del XVI Convegno ANIDIS. De Luca, A. and Guidi, L.G. (2019). “State of Art on the Worldwide Evolution of Base Isolation Design”. Soil Dynamics and Earthquake Engineering, 125 (2019) 105722. https://doi.org/10.1016/j.soildyn.2019.105722. De Luca, A. and Guidi L.G. (2020). “Base isolation issues in Italy: Integrated Architectural and Structural Design”. Soil Dynamics and Earthquake Engineering, 130 (2020) 105912. https://doi.org/10.1016/j.soildyn.2019.105912. De Luca, A., Guidi, L.G., Brandonisio, G., Ponzo, F.C., (2022). “Horizontal capacity of base isolation rubber devices under large vertical design stress, valued through full-scale tests”. Soil Dynamics and Earthquake Engineering. Volume 159, August 2022, 107264. https://doi.org/10.1016/j.soildyn.2022.107264. De Luca, F., Verderame, G.M. (2021). Seismic Vulnerability Assessment: Reinforced Concrete Structures. In: Beer, M., Kougioumtzoglou, I., Patelli, E., Au, IK. (eds) Encyclopedia of Earthquake Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-36197 5_252-1. Economidou M, Atanasiu B, Despret C, Maio J, Nolte I, Rapf O. Europe’s buildings under the microscope. A country-by-country review of the energy performance of buildings. Buildings Performance Institute Europe (BPIE). 2011. Fajfar, P. (1999). “Capacity spectrum method based on inelastic demand spectra” Earthquake Engineering and Structural Dynamics., 28: 979-993. Fajfar, P. (2000). “A Nonlinear Analysis Method for Performance-Based Seismic Design”. Earthquake Spectra. Vol 16, Issue 3, 2000. Gkournelos, P.D., Triantafillou, T.C., Bournas, D.A., (2021). “Seismic upgrading of existing reinforced concrete buildings: A state-of-the-art review”. Engineering Structures 240 (2021) 112273. https://doi.org/10.1016/j.engstruct.2021.112273. Terenzi, G:, Fuso, E., Sorace, S., Costoli, I. (2020).” Enhanced Seismic Retrofit of a Reinforced Concrete Building of Architectural Interest” Buildings 2020, 10, 211; doi:10.3390/buildings10110211. S.T.S. S.r.l., (2021) Manuale d’uso. CDSWin + CDMaWin Strutture in c.a., acciaio, legno e muratura.