PSI - Issue 62

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Mattia Zizi et al. / Procedia Structural Integrity 62 (2024) 430–437 M. Zizi et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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A preliminary numerical model of the bridge was realized in Abaqus software based on the geometrical survey and simplified assumptions on the mechanical characteristics of the materials. The numerical frequencies and mode shapes determined by means of the modal analysis were thus compared against the experimental ones. Overall, the rough numerical representation of the bridge is characterized by adequate consistency with the experimental evidence, in terms of both frequencies and modal shapes. In this sense it must be remarked that neither additional masses nor stiffness of the road pavement and concrete slabs at the road level were considered in the model. The study is still ongoing and will be further extended by investigating the internal geometry of the structure and by mechanically characterizing the materials by means of non-destructive and semi-destructive tests. Thanks to these newly-acquired data, an optimization-based model updating procedure will be performed in order to obtain a reliable numerical model able to faithfully simulate the actual response of the bridge against various types of loads (e.g. traffic and earthquake). Acknowledgement Part of the present study has been developed within the activities of project “SAFE_MAB - Advanced procedures for SAFEty assessment of existing Masonry Arch Bridges”, funded by the University of Campania “Luigi Vanvitelli”. The first author is funded by MUR (Ministry of University and Research) through PON FSE 2014-2020 program (contract: 49-I-32603-3). Moreover, the authors thank the Province of Caserta for the collaboration in performing the research activities. References Amador, S.D.R., Brincker, R., 2021. Robust multi-dataset identification with frequency domain decomposition. J Sound Vib 508. Armesto, J., Roca-Pardiñas, J., Lorenzo, H., Arias, P., 2010. Modelling masonry arches shape using terrestrial laser scanning data and nonparametric methods. Eng Struct 32, 607 – 615. Borlenghi, P., Saisi, A., Gentile, C., 2022. Determining and Tuning Models of a Masonry Bridge for Structural Assessment. Lecture Notes in Civil Engineering 200 LNCE, 409 – 417. Brincker, R., Zhang, L., Andersen, P., 2001. Modal identification of output-only systems using frequency domain decomposition. Smart Mater Struct 10, 441 – 445. Dassault Systèmes Simulia Corp., 2023. ABAQUS. Providence, Ri, USA. Gilbert, M., Valentino, J., Smith, C., Pritchard, T., 2020. Limit Analysis of Masonry Arch Bridges Using Discontinuity Layout Optimization. Structural Integrity 11, 307 – 314. Ministero delle Infrastrutture e dei Trasporti, 2019. Istruzioni per l’applicazione dell’«Aggiornamento delle “Norme tecniche per le costruzioni”» di cui al decreto ministeriale 17 gennaio 2018. CIRCOLARE 21 gennaio 2019, n. 7 C.S.LL.PP. Papa, T., Grillanda, N., Milani, G., 2021. Three-dimensional adaptive limit analysis of masonry arch bridges interacting with the backfill. Eng Struct 248. Pepi, C., Cavalagli, N., Gusella, V., Gioffrè, M., 2021. An integrated approach for the numerical modeling of severely damaged historic structures: Application to a masonry bridge. Advances in Engineering Software 151, 102935. Riveiro, B., Morer, P., Arias, P., De Arteaga, I., 2011. Terrestrial laser scanning and limit analysis of masonry arch bridges. Constr Build Mater 25, 1726 – 1735. Silva, R., Costa, C., Arêde, A., 2022. Numerical methodologies for the analysis of stone arch bridges with damage under railway loading. Structures 39, 573 – 592. Zhang, Y., Tubaldi, E., Macorini, L., Izzuddin, B.A., 2018. Mesoscale partitioned modelling of masonry bridges allowing for arch-backfill interaction. Constr Build Mater 173, 820 – 842. Zizi, M., Bencivenga, P., De Matteis, G., 2023. Handling policies for Italian existing bridges with a territorial approach: the case study of Caserta, Italy. Structures 48, 1306 – 1321. Zizi, M., Chisari, C., De Matteis, G., 2024. Effects of pre-existing damage on vertical load-bearing capacity of masonry arch bridges. Eng Struct 300, 117205.