Abstract
The deterioration of the performance of offshore bridges is particularly prominent due to the complex natural environment, including the coupling effects of earthquake and seawater erosion. In particular, bridge piers are the main energy-consuming and load-bearing components, so that excellent seismic capacity of bridge piers is the key to avoiding bridge damage. Although earthquake resistant behavior of ordinary reinforced concrete bridge piers (ordinary pier) can be improved by increasing the section size and reinforcement ratio of piers, the improvement of the earthquake resistant behavior is limited. To further improve the earthquake resistant behavior of bridge piers, high-tensile reinforcement engineered cementitious composite (ECC) bridge piers are utilized and time-varying seismic fragility analysis are conducted in this study. The refined model of a bridge pier is built by OpenSees. First, the influence of ECC replacement height on pier curvature is analyzed to determine the reasonable ECC height. Then, the time-varying fragility analysis of high-tensile reinforcement ECC piers (ECC composite piers) with durability damage are evaluated considering the time-varying law of materials. Four damage states, slight damage, moderate damage, extensive damage and complete collapse, are utilized in the study. These fragility curves indicate the durability damage can debase the earthquake resistant behavior of piers continually, the exceedance probability of the same state of destruction increases with the increase of peak ground acceleration (PGA) and service time of pier. The results also indicate that the corrosion level of chloride ion to pier is small during the early service period, and the bridge pier vulnerable curve is similar to that of the new bridge pier. As the level of chlorine ion corrosion deepens, transcendental probability is increased. Compared with the ordinary pier, the exceedance probability in each limit state of ECC composite piers is significantly reduced. The proposed ECC composite pies leads to better realistic time-varying earthquake resistant behavior.
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Acknowledgement
This research was supported by the National Natural Science Foundation of China under Grant No.51608488, Scientific and Technological Project of Henan Province, China under Grant No. 222102320006, Zhengzhou University 2022 Annual Basic Research Foundation for Young Teachers, China under Grant No. JC22547025, and Postdoctoral Research Grant in Henan Province.
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Supported by: National Natural Science Foundation of China under Grant No. 51608488, Scientific and Technological Project of Henan Province, China under Grant No. 222102320006, Zhengzhou University 2022 Annual Basic Research Foundation for Young Teachers, China under Grant No. JC22547025, and Postdoctoral Research Grant in Henan Province
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Liang, Y., Zhao, Z., Li, P. et al. Time-varying seismic fragility analysis of durability damage of high-tensile reinforcement ECC bridge pier. Earthq. Eng. Eng. Vib. 22, 513–525 (2023). https://doi.org/10.1007/s11803-023-2181-0
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DOI: https://doi.org/10.1007/s11803-023-2181-0