PSI - Issue 44

P. Sorrentino et al. / Procedia Structural Integrity 44 (2023) 1648–1655 P. Sorrentino et al./ Structural Integrity Procedia 00 (2022) 000 – 000

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8

Aggregate A+B

Columns Beams Equivalent frames Plastic hinges

Collapse Severe damage Low damage

Figure 8. Collapse mechanisms of aggregate A+B in y direction.

7. Conclusions The seismic vulnerability of the Zoological Station Anton Dohrn in Naples has been evaluated in this paper. The examined case study is a complex masonry building that includes six parts (the central part, West wing, East wing, two connecting parts and the library) built in different periods. The central part (A) and the connecting parts (B) have been analysed via preliminary evaluation of geometrical parameters, as the ratio between the area of masonry walls and the geometric area, and via non-linear static analysis. The results have shown that these structures are characterised by ratio of area that are different in longitudinal direction and comparable in the transversal one. Furthermore, in this simple case, it has been demonstrated that where the ratios of area are similar, the curves in terms of F/W of the parts A, B and A+B are also similar. In particular, in the longitudinal direction, where the ratios are different for the two parts A and B, it is observed that this difference also corresponds to a difference in the curves represented in terms of F/W. Starting from these results, a proposal to evaluate the seismic vulnerability of aggregates is formulated as follows. As preliminary analysis of an aggregate, to define whether it is necessary to carry out the analysis of an aggregate, the ratios between masonry area and geometric area can be evaluated. In the direction in which the ratios are similar, it is possible to analyse the single structure by neglecting the interaction with the other buildings, or the aggregate, as the same results in terms of seismic capacity and collapse mechanisms are obtained. References Valente, M., Brandonisio, G., Milani, G., De Luca, A., 2020. Seismic response evaluation of ten tuff masonry churches with basilica plan through advanced numerical simulations. International Journal of Masonry Research and Innovation , 5 (1), 1-46 Brandonisio, G., De Luca, A., 2021. Analytical modelling for the seismic assessment of pointed arches supported by buttresses. International Journal of Masonry Research and Innovation , 6 (4), 384-404 Brandonisio, G., Angelillo, M., De Luca, A., 2020. Seismic capacity of buttressed masonry arches. Engineering Structures , 215 , 110661 Formisano, A, Mazzolani, FM, Florio, G, Landolfo, R, 2010. A quick methodology for seismic vulnerability assessment of historical masonry aggregates. COST C26 Final Conference "Urban Habitat Constructions under Catastrophic Events”, Naples, September 2010 Florio, R., 2015. L’architettura delle idee. La Stazione Zoologica Anton Dohrn di Napoli, Editori Paparo Roldelet, 1802. Trattato teorico e pratico dell’arte di edificare, Volume IV, Tomo IV – Teoria delle costruzioni CSLLPP (Consiglio Superiore dei Lavori Pubblici). D.M. 17 gennaio 2018 in materia di “norme tecniche per le costruzioni”. Gazzetta Ufficiale n.42 del 20 febbraio 2018, Supplemento ordinario n.8, Ministero delle Infrastrutture e dei trasporti, Roma; 2018, in Italian Magenes, G., 2000. A method for pushover analysis in seismic assessment of masonry buildings. 12WCEE 2000: 12th World Conference on Earthquake Engineering, Auckland, New Zealand, Sunday 30 January - Friday 4 February 2000