Abstract
This study offers a probabilistic framework for the seismic life-cycle cost (SLCC) assessment of aging highway bridge structures in complex seismogenic zones, followed by a case-study application on a popular bridge class in Seattle (United States). The proposed framework efficiently handles the implications of differing seismic hazard scenarios (crustal and subduction earthquakes) along with time-dependent bridge deterioration mechanisms on seismic fragility and lifetime economic losses. These losses, stemming from the seismic damage-induced repair of critical bridge components, may be uncertain depending on the repair technique, availability of resources, or decision of the stakeholder. Unlike previous works that have evaluated seismic losses under a single hazard source and deterministic repair costs, this study aimed for a better approximation of the accumulated lifetime losses for aging highway bridges under simultaneous exposure to differing hazard sources, while accounting for repair uncertainties. The case-study results revealed that the SLCCs using deaggregated hazard sources incurred significantly higher contributions from subduction earthquake sources than shallow crustal earthquake sources for both as-built and aging bridge structures. Lastly, based on the proposed framework, a statistical model is proposed for easy adoptability by stakeholders and decision-makers for the SLCC computation of bridge structures in the case-study region.
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Data Availability Statement
The following data, models, or code generated or used during the study are available from the corresponding author by reasonable request: (1) long- and short-duration ground-motion records; (2) time-dependent deterioration models for bridge components under corrosion effects; (3) IDA data for the case-study bridge; and (4) SLCC analysis data for the case-study bridge geometries.
Acknowledgments
This research was funded by the Science and Engineering Research Board (statutory body under the Department of Science and Technology, India) through Grant Nos. SRG/2021/001574 and CRG/2021/000777. The support is gratefully acknowledged.
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Journal of Bridge Engineering
Volume 28 • Issue 12 • December 2023
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© 2023 American Society of Civil Engineers.
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Received: Jul 10, 2022
Accepted: Aug 10, 2023
Published online: Sep 22, 2023
Published in print: Dec 1, 2023
Discussion open until: Feb 22, 2024
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