Browsing by Author "Allen, Eduardo"

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    Integration of resilience and risk to natural hazards into transportation asset management of road networks: a systematic review
    (Taylor & Francis Ltd., 2023) Allen, Eduardo; Costello, Seosamh B.; Henning, Theunis F. P.; Chamorro Giné, Marcela Alondra; Echaveguren, Tomás
    Transportation asset management is a systematic process for the operation, maintenance, and upgrade of physical transportation assets over their life cycle. Although transportation asset management has continued to evolve over the years, the integration of transportation resilience into the process is an ongoing challenge for transportation agencies. Given that natural hazard events can result in significant damage to assets as well as cascading effects on other critical networks that depend on transportation systems to operate, the importance of this challenge cannot be overstated. Consequently, this paper presents a systematic literature review on the integration of resilience and risk into transportation asset management, with a focus on road networks, in order to understand the current state of the art and practice and to identify the ongoing challenges in the field. The review specifically focuses on the integration guidelines adopted by different countries and departments of transportation, as well as the different consequence modeling approaches used, resilience metrics, and methods to integrate transportation resilience into transportation asset management. A number of research gaps in the current state of the art and practice are then highlighted, and potential future research directions are presented.
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    Sensitivity analysis and uncertainty quantification of a seismic risk model for road networks
    (WILEY, 2021) Allen, Eduardo; Chamorro Giné, Marcela Alondra; Poulos, Alan; Castro, Sebastian; Llera Martin, Juan Carlos de la; Echaveguren, Tomas
    Natural hazards may cause significant disruptions to road infrastructure, subsequently affecting road agencies, users, and productive activities. Despite the existence of infrastructure fragilities to seismic hazard and some operational consequences on network mobility, previous research has not modeled risk in terms of traffic disruptions and consequent travel time delays in subduction environments, analyzing the sensitivity to model parameters and quantified model uncertainty. This study proposes a risk framework to evaluate operational consequences in interurban road networks exposed to seismic hazard using travel time delays and propagate uncertainty in the model. Risk values are evaluated using Monte Carlo simulations, and uncertainty is propagated using a polynomial chaos expansion meta-model. The framework was applied to a very critical interurban network in central Chile. Results demonstrate that the parameters that most significantly influence risk are fragility, loss of road capacity, and traffic volume.