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Seismic resilience assessment of extended pile shaft supported coastal bridges considering scour and uniform corrosion effects
Abstract The resilience-informed assessment for coastal highway bridges exposed to multiple hazards plays a crucial role in the decision-making process for their operation, maintenance, and management during the bridge’s long-term service period. This study performs a seismic resilience assessment for a coastal reinforced concrete (RC) bridge under the combined effects of scour and uniform corrosion. Toward this goal, an extended pile shaft supported coastal RC bridge is taken as the benchmark and fifteen scenarios are generated to cover three regular scour conditions and five different corrosion levels. To inform the bridge management, the probabilistic distribution of the bridge service time corresponding to different corrosion levels is developed. Subsequently, the finite element model (FEM) for each scenario of the benchmark coastal highway RC bridge is developed, involving the soil-pile interaction and considering the uncertainty of structural and geotechnical parameters, as well as earthquake ground motions. The failure mode of the corroded extended pile shaft is identified as a flexural failure by comparing their flexural and shear capacities. Finally, a resilience loss ratio is proposed in this study for the first time to quantify the impacts of corrosion level and scour depth changes on seismic resilience across different ground motion intensities. Results indicate that both the seismic fragility and resilience decrease as the corrosion intensifies over time. Specifically, at a given intensity measure (IM) level, the resilience loss ratio increases as the corrosion level intensifies. For the studied benchmark bridge, the scour significantly increases the structural fundamental period, consequently reducing the curvature demand on the pile shaft. As a result, the scour generally decreases the failure probability and the earthquake-induced functionality loss for the extended pile shaft. As scour depth increases, the resilience loss of the bridge at a given corrosion level decreases.
Highlights Seismic risk and resilience of coastal bridges are assessed considering scour and corrosion. Bridge service time distributions for different corrosion levels are derived. Both pile foundation corrosion and soil-pile interactions are considered. Corrosion level and scour depth effects on bridge’s risk and resilience are studied. Impact of corrosion level on extended pile shaft’s curvature capacity is assessed.
Seismic resilience assessment of extended pile shaft supported coastal bridges considering scour and uniform corrosion effects
Abstract The resilience-informed assessment for coastal highway bridges exposed to multiple hazards plays a crucial role in the decision-making process for their operation, maintenance, and management during the bridge’s long-term service period. This study performs a seismic resilience assessment for a coastal reinforced concrete (RC) bridge under the combined effects of scour and uniform corrosion. Toward this goal, an extended pile shaft supported coastal RC bridge is taken as the benchmark and fifteen scenarios are generated to cover three regular scour conditions and five different corrosion levels. To inform the bridge management, the probabilistic distribution of the bridge service time corresponding to different corrosion levels is developed. Subsequently, the finite element model (FEM) for each scenario of the benchmark coastal highway RC bridge is developed, involving the soil-pile interaction and considering the uncertainty of structural and geotechnical parameters, as well as earthquake ground motions. The failure mode of the corroded extended pile shaft is identified as a flexural failure by comparing their flexural and shear capacities. Finally, a resilience loss ratio is proposed in this study for the first time to quantify the impacts of corrosion level and scour depth changes on seismic resilience across different ground motion intensities. Results indicate that both the seismic fragility and resilience decrease as the corrosion intensifies over time. Specifically, at a given intensity measure (IM) level, the resilience loss ratio increases as the corrosion level intensifies. For the studied benchmark bridge, the scour significantly increases the structural fundamental period, consequently reducing the curvature demand on the pile shaft. As a result, the scour generally decreases the failure probability and the earthquake-induced functionality loss for the extended pile shaft. As scour depth increases, the resilience loss of the bridge at a given corrosion level decreases.
Highlights Seismic risk and resilience of coastal bridges are assessed considering scour and corrosion. Bridge service time distributions for different corrosion levels are derived. Both pile foundation corrosion and soil-pile interactions are considered. Corrosion level and scour depth effects on bridge’s risk and resilience are studied. Impact of corrosion level on extended pile shaft’s curvature capacity is assessed.
Seismic resilience assessment of extended pile shaft supported coastal bridges considering scour and uniform corrosion effects
Zhou, Lianxu (author) / Alam, M. Shahria (author) / Dong, You (author) / Feng, Ruiwei (author)
Engineering Structures ; 304
2024-02-07
Article (Journal)
Electronic Resource
English
Load Rating of Pile-Supported Bridges Susceptible to Scour
| British Library Online Contents | 2013
Load Rating of Pile-Supported Bridges Susceptible to Scour
| Online Contents | 2013