PSI - Issue 78

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ScienceDirect

Procedia Structural Integrity 78 (2026) 753–760

XX ANIDIS Conference Seismic assessment of masonry arch bridges using discontinuum substructural models Alessia Furiosi a , Nicolò Damiani a,b, *, Mihai Manuel Motoc a , Maria Rota b , Andrea Penna a,b

a Department of Civil Engineering and Architecture (DICAr), University of Pavia, Pavia, Italy b European Centre for Training and Research in Earthquake Engineering (EUCENTRE), Pavia, Italy

© 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of XX ANIDIS Conference organizers Keywords : Distinct Element Method; Masonry arch bridge; Stability assessment; Substructural models Abstract The assessment of the seismic vulnerability of existing masonry arch bridges has gained growing attention within the technical and scientific community, particularly in Italy, where these structures hold both critical infrastructural and cultural importance. Their inherently complex structural behavior calls for advanced modeling approaches capable of reliably capturing their response under static and dynamic loads, thereby facilitating the identification of effective retrofitting solutions. This study investigates the seismic performance of masonry arch bridges through the development of three-dimensional discontinuum substructural numerical models using the commercial software 3DEC. The modeling framework incorporates both rigid and deformable blocks, parameterized to represent structural and non-structural components such as piers, abutments, backing, spandrel walls, and filling material. Static and dynamic analyses are conducted to evaluate the response of these components under seismic loading. By employing a substructural modeling approach, it becomes possible to isolate and analyze critical bridge segments, such as vertical sections taken halfway between adjacent arches or halfway between consecutive piers. This approach offers the advantage of significantly reducing computational demands while preserving the accuracy of the simulated structural response. The findings contribute valuable insights for the seismic vulnerability assessment of historic masonry arch bridges, supporting their preservation and enhancing structural resilience.

* Corresponding author. Tel.: +39-03825169823. E-mail address: nicolo.damiani@unipv.it

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of XX ANIDIS Conference organizers 10.1016/j.prostr.2025.12.096