Abstract
An analysis model is presented to estimate the time-varying seismic performance of deteriorating pile foundations subjected to marine chloride-induced corrosion. Based on the presented model, a probabilistic seismic fragility analysis of pile foundations is conducted considering uncertainties of ground motion. The effects of chloride erosion and seismic action on the seismic response of pile foundations are investigated in this study. The displacement and damage state of deteriorating pile foundations under seismic action at different service times are obtained through seismic vulnerability analysis. The analysis results have revealed that the chloride attack has a great impact on the seismic vulnerability analysis of deteriorating pile foundations. The ultimate state threshold of pile foundations decreases with the increase of service life. The ultimate lateral bearing capacity decreases significantly with increasing service time. Moreover, the seismic fragility is underestimated based on the vulnerability of pile foundations model without considering the factors of soil-pile interaction. The seismic performance decreases significantly and the failure probability of pile shows an accelerated growth trend with increasing service time. The exceedance probability increases dramatically as the damage limit state increases for the same time.
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Acknowledgements
This research was financially supported by the National Natural Science Foundation of China (Grant No. 52078289), the Shanghai International Science and Technology Cooperation Project (Grant No. 19520744100), the Shanghai Soft Science Key Project (Grant No. 22692113900), and the State Key Laboratory of Coastal and Offshore Engineering (Dalian University of Technology) (Grant No. LP2111).
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Shao, W., He, L., Shi, D. et al. Seismic Vulnerability Assessment of Deteriorating Pile Foundations in Marine Environments. Geotech Geol Eng 41, 2467–2479 (2023). https://doi.org/10.1007/s10706-023-02409-5
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DOI: https://doi.org/10.1007/s10706-023-02409-5