PSI - Issue 78

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ScienceDirect

Procedia Structural Integrity 78 (2026) 81–88

© 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: Seismic Risk Assessment; Viaducts; Site Effects; Multi-hazard; Liquefaction; Geotechnical Modeling Abstract The study addresses the complex challenge of assessing the impact of natural hazards on critical infrastructure like road bridges. The GETI index, which quantifies the seismic risk by considering structural, geological, and geotechnical factors, including secondary earthquake effects (soil amplification, liquefaction and landslides) is applied to the Cherry Hill Interchange viaduct near Salt Lake City, Utah, an area with high seismic risk and soft soils. The analysis involved two steps: a literature review and data analysis to assess susceptibility to the different hazards (Level 1), followed by a detailed site response and liquefaction analysis to quantify ground shaking and soil permanent deformations (Level 2). The results were used with fragility curves to estimate damage probability of the viaduct. In the Level 2, a PGA of 0.2 g and lateral displacements of about 3 meters due to liquefaction were estimated for a rare earthquake scenario (2% probability in 50 years). These values indicated a 100% probability of damage to the viaduct, primarily due to lateral spreading, with minimal impact from ground shaking. The study also tested the index’s sensitivity by comparing conditions before and after soil reinforcement executed in the area. After soil improvement, liquefaction was prevented and the updated GETI index showed a 0% probability of high-to-severe damage and only a 4% chance of low damage. This case study demonstrates that the GETI index is a valuable tool for assessing multi hazard risks in linear infrastructure and can guide cost-effective mitigation strategies. XX ANIDIS Conference Application of a novel geological-geotechnical index for assessing multi-hazard risk in linear infrastructure Nadia Salvatore a,b *, Alessandro Pagliaroli b,d , Kyle M. Rollins c , Giuseppe Brando b a University of Catania, Via Santa Sofia 64, Catania 95123, IT b University “G. d’Annunzio” of Chieti-Pescara, Viale Pindaro 42, Pescara 65129, IT c Brigham Young University, Provo, UT 84602, USA d Institute of Environmental Geology and Geoengineering (IGAG) National Research Council (CNR), Roma 00010, IT

* Corresponding author. E-mail address: nadia.salvatore@phd.unict.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.2025.12.011