PSI - Issue 78

ScienceDirect Structural Integrity Procedia 00 (2025) 000–000 Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 78 (2026) 1927–1934

© 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 Abstract In the seismic reliability assessment process, many uncertainty sources are usually involved in the analysis. In general, two sets of uncertainty sources can be involved in in the analysis, the first group involved in the hazard computation, the second group involved in the fragility computation. This paper wants to analyze the main uncertainty sources involved in both hazard and fragility analysis, and then investigate their impact on the final reliability index variability. The case study is represented by a multi-span steel concrete composite bridge and results shows the uncertainty of the final reliability index is influenced by the variability of the adopted models an parameters. © 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) XX ANIDIS Conference The Influence of the seismic hazard and structural fragility related uncertainties on the seismic reliability Lorenzo Hofer a, *, Klajdi Toska a , Mariano Angelo Zanini a , Flora Faleschini a , Carlo Pellegrino a a Department of Civil, Environmental and Architectural Engineering, University of Padova, via F. Marzolo 9, Padova, Italy Abstract In the seismic reliability assessment process, many uncertainty sources are usually involved in the analysis. In general, two sets of uncertainty sources can be involved in in the analysis, the first group involved in the hazard computation, the second group involved in the fragility computation. This paper wants to analyze the main uncertainty sources involved in both hazard and fragility analysis, and then investigate their impact on the final reliability index variability. The case study is represented by a multi-span steel concrete composite bridge and results shows the uncertainty of the final reliability index is influenced by the variability of the adopted models an parameters. © 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: existing bridges, seismic reliability, uncertainties, PSHA, structural analysis 1. Introduction In the engineering practice, the seismic reliability assessment of a structure or infrastructure is usually achieved by coupling the seismic hazard curve and the fragility curves. The hazard curve represents the seismicity of the site and it is usually obtained via the so-called Probabilistic Seismic Hazard Analysis (PSHA, Cornell 1968; McGuire 1977). On the other hand fragility curves represent the probabilistic structural behavior of the considered structure and are XX ANIDIS Conference The Influence of the seismic hazard and structural fragility related uncertainties on the seismic reliability Lorenzo Hofer a, *, Klajdi Toska a , Mariano Angelo Zanini a , Flora Faleschini a , Carlo Pellegrino a a Department of Civil, Environmental and Architectural Engineering, University of Padova, via F. Marzolo 9, Padova, Italy Peer-review under responsibility of XX ANIDIS Conference organizers Keywords: existing bridges, seismic reliability, uncertainties, PSHA, structural analysis 1. Introduction In the engineering practice, the seismic reliability assessment of a structure or infrastructure is usually achieved by coupling the seismic hazard curve and the fragility curves. The hazard curve represents the seismicity of the site and it is usually obtained via the so-called Probabilistic Seismic Hazard Analysis (PSHA, Cornell 1968; McGuire 1977). On the other hand fragility curves represent the probabilistic structural behavior of the considered structure and are

* Corresponding author. E-mail address: lorenzo.hofer@dicea.unipd.it * Corresponding author. E-mail address: lorenzo.hofer@dicea.unipd.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 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

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.2025.12.245