PSI - Issue 78

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 78 (2026) 852–858

© 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: Masonry Bridge; Masonry Arch; Seismic Assessement; 3D Model; Level of Knoledge; Abstract Masonry arch bridges represent a significant portion of the existing infrastructural heritage in Italy, often serving as critical ele ments in local and regional transportation networks. Given their historical value and widespread use, ensuring their structural safety under both static and seismic conditions is a matter of growing importance. This paper presents a code-compliant assessment of a historical masonry arch bridge, with a focus on how di ff erent levels of knowledge a ff ect the evaluation of its safety. Starting from an initial analysis based on conservative assumptions and standard material properties from design codes, the study progressively incorporates more refined information obtained through in-situ mechanical testing and detailed inspections. Numerical models cor responding to each knowledge level are developed in accordance with current national and international standards. The influence of the available knowledge on the estimated safety margins is evaluated under both gravity and seismic loading. The results highlight how improved knowledge can reduce uncertainties, leading to more accurate and potentially less conservative safety assessments. This work underscores the importance of knowledge-driven approaches in the structural evaluation of existing masonry bridges, o ff ering practical guidance for preservation and risk mitigation strategies. XX ANIDIS Conference Code-compilant assessment of a masonry arch bridge by using di ff erent models Allegretti M. a, ∗ , Corritore D. b , Moretti M. a , Paolacci F. b , Quinci G. b a SAFEBRIDGE ENGINEERING s.r.l., Via del Poggio Laurentino 32, 00144, Rome, Italy b Department of Civil, Computer Science and Aeronautical Technologies Engineering, Roma Tre University, Via Vito Volterra 62, 00146, Rome, Italy

1. Introduction

Bridges are fundamental transportation infrastructures Mitoulis et al. (2021), as they provide essential connections between communities and enable the movement of goods and people. They represent a key element of the transporta tion system, which relies on a vast existing infrastructural heritage that must be preserved and kept in service while ensuring the e ffi ciency of the network. In Italy, and more generally in Europe, masonry bridges, both railway and road, constitute a significant part of this system Melbourne et al. (2007); da Porto et al. (2016); Zampieri et al. (2015). In recent years, numerous experimental studies have been conducted to characterize the behavior and properties of

∗ Corresponding author. Tel.: + 39-331 734 0843. E-mail address: matteo.allegretti@safebridge.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.2025.12.109