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Title |
A Study on Seismic Fragility of PSC Bridge Considering Aging and Retrofit Effects
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Authors |
안효준(Hyojoon An) ; 이종한(Jong-Han Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2020.24.6.34 |
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Keywords |
PSC교량; 노후화; FRP보강; 비선형 해석; 지진취약도 PSC bridge; aging effect; FRP retrofit; nonlinear analysis; seismic fragility |
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Abstract |
In recent years, magnitude and frequency of earthquakes have increased in Korea. Damage to a bridge, which is one of the main infrastructures, can directly lead to considerable loss of human lives. Therefore, engineers need to evaluate the seismic fragility of the structure and prepare for the possible seismic damage. In particular, the number of aging bridges over 30 years of service increases, and thus the seismic analysis and fragility requires accounting for the aging and retrofit effects on the bridge. In this study, the nonlinear static and dynamic analyses were performed to evaluate the effects of the aging and FRP retrofit on a PSC bridge. The aging and FRP retrofit were applied to piers that dominate the response of the bridge during earthquakes. The maximum displacement of the bridge increased due to the aging of the pier but decreased when FRP retrofit applied to the aged pier. In addition, seismic fragility analysis was performed to evaluate the seismic behavior of the bridge combined with the seismic performance of the pier. Compared with the aged bridge, the FRP retrofit bridge showed a decrease in the seismic fragility in all levels of damage. The reduction of the seismic fragility in the FRP bridge was prominent as the value of PGA and level of damage increased.
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