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Structural Engineering and Mechanics
  Volume 66, Number 4, May25 2018, pages 515-529

Impact spectrum of flood hazard on seismic vulnerability of bridges
Taner Yilmaz and Swagata Banerjee

    Multiple hazards (multihazard) conditions may cause significant risk to structures that are originally designed for individual hazard scenarios. Such a multihazard condition arises when an earthquake strikes to a bridge pre-exposed to scour at foundations due to flood events. This study estimates the impact spectrum of flood-induced scour on seismic vulnerability of bridges. Characteristic river-crossing highway bridges are formed based on the information obtained from bridge inventories. These bridges are analyzed under earthquake-only and the abovementioned multihazard conditions, and bridge fragility curves are developed at component and system levels. Research outcome shows that bridges having pile shafts as foundation elements are protected from any additional seismic vulnerability due to the presence of scour. However, occurrence of floods can increase seismic fragility of bridges at lower damage states due to the adverse impact of scour on bridge components at superstructure level. These findings facilitate bridge design under the stated multihazard condition.
Key Words
    bridges; earthquake; flood; multihazard; fragility
Taner Yilmaz: Department of Civil Engineering, Ozyegin University, Istanbul, Turkey
Swagata Banerjee: Department of Civil Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India

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