ABSTRACT
Environmental degradation mechanisms such as corrosion can have a significant impact on the resilience of the reinforced concrete (RC) highway bridges present near the harsh marine environment within high seismic zones. This study aims to evaluate the effectiveness of fiber-reinforced polymer (FRP) jackets in enhancing the seismic resilience of deteriorated highway bridges. A representative case-study non-seismically designed highway bridge located close to marine sources within the seismic active region of Gujarat, India is selected. Time-dependent chloride-induced corrosion deterioration of bridge pier is evaluated considering non-uniform pitting corrosion. FRP jacket is used to retrofit the deteriorated bridge pier, and pushover analysis results reveal a significant increase in the damage state thresholds of the FRP retrofitted deteriorated bridge pier. Seismic fragility curves of as-built, 75-year aging and FRP retrofitted bridges are developed and combined with suitable loss and recovery models to calculate the seismic resilience of bridges for varying earthquake intensity. From the result, it is observed that the resilience of the bridge decreases with an increase in earthquake intensity and FRP retrofit significantly enhances the seismic resilience of deteriorated bridge.
