Seismic Vulnerability Assessment of Aging Highway Bridges Using Fragility Curves

March 27, 2026Open Access

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Key Points

This research aims to evaluate the seismic vulnerability of aging highway bridges influenced by structural degradation.
Developed time-variant seismic fragility curves for a three-span reinforced concrete bridge.
Accounted for seismic demand, structural capacity degradation from chloride corrosion, and modeling uncertainty.
Used nonlinear static and incremental dynamic analysis methods in an OpenSees finite element model.
Characterized ground motion uncertainty with twenty ground motion records.
At design-level hazard (PGA=0.18g), the likelihood of complete damage for the aged bridge is 0.08.
Estimated structural capacity has decreased by 15–30% due to corrosion and aging.
Fragility curves reveal significant risk for aging infrastructure under seismic events.

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This assessment quantifies damage likelihood in aging highway bridges, indicating a need for structural upgrades.

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Aduot Madit Anhiem (2026) studied this question.

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