Bridges in a marine environment have been suffering from the chloride attack for a long period of time. Due to the fact that different sections of piers may be exposed to different conditionals, the chloride-induced corrosion not only affects the scale of the deterioration process but also significantly modifies over time the damage propagation mechanisms and the seismic damage distribution. In order to investigate the seismic damage of existing RC bridges subject to spatial chloride-induced corrosion in a marine environment, Duracrete model is applied to determine the corrosion initiation time of reinforcing steels under different exposure conditionals and the degradation models of reinforcing steels, confined concrete, and unconfined concrete are obtained based on the previous investigation. According to the seismic fragility assessment method, the damage assessment approach for the existing RC bridges subject to spatial chloride-induced corrosion in a marine environment is present. Moreover, a case study of a bridge under two kinds of water regions investigated the influence of spatial chloride-induced corrosion on the seismic damage of piers and other components. The results show that the spatial chloride-induced corrosion may result in the section at the low water level becoming more vulnerable than the adjacent sections and the alteration of seismic damage distribution of piers. The corrosion of pier will increase the seismic damage probability of itself, whereas it will result in a reduction of seismic damage probability of other components. Moreover, the alteration of seismic damage distribution of piers will amplify the effect. Due to the fact that the spatial chloride-induced corrosion of piers may alter the yield sequence of cross section, it then affects the seismic performance assessment of piers. A method to determine the evolution probability of yield sequence of corroded piers is proposed at last. From the result, the evolution probability of yield sequence of piers in longitudinal direction depends on the relationship between the height of piers and submerged zone. Moreover, the height of piers, submerged zone, and tidal zone have a common influence on the evolution of yield sequence of piers in transversal direction.

中文翻译：

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海洋环境中受氯化物腐蚀的现有钢筋混凝土桥梁的生命周期地震脆性评估

海洋环境中的桥梁长期以来一直遭受氯化物侵蚀。由于桥墩不同截面可能受到不同条件的影响，氯化物引起的腐蚀不仅影响恶化过程的规模，而且随着时间的推移显着改变了损伤传播机制和地震损伤分布。为研究海洋环境中存在空间氯化物腐蚀的既有钢筋混凝土桥梁的地震损伤，应用Duracrete模型确定不同暴露条件下钢筋的腐蚀起始时间以及钢筋、约束混凝土的退化模型。 ，无侧限混凝土是根据前面的调查得到的。根据地震易损性评估方法，现有 RC 桥梁在海洋环境中受到空间氯化物腐蚀的损伤评估方法是存在的。此外，以两种水域下的桥梁为例，研究了空间氯化物腐蚀对桥墩和其他构件地震损伤的影响。结果表明，空间氯化物腐蚀可能导致低水位断面比相邻断面更脆弱，导致桥墩震害分布发生改变。桥墩的腐蚀会增加自身的地震破坏概率，而导致其他构件的地震破坏概率降低。而且，桥墩震害分布的改变会放大这种影响。由于桥墩空间氯化物腐蚀可能改变截面屈服顺序，进而影响桥墩抗震性能评价。最后提出了一种确定锈蚀墩屈服序列演化概率的方法。由结果可知，墩柱纵向屈服序列的演化概率取决于墩高与淹没区的关系。此外，桥墩高度、淹没区和潮汐带对桥墩横向屈服序列的演化有共同的影响。墩柱纵向屈服序列的演化概率取决于墩高与淹没区的关系。此外，桥墩高度、淹没区和潮汐带对桥墩横向屈服序列的演化有共同的影响。墩柱纵向屈服序列的演化概率取决于墩高与淹没区的关系。此外，桥墩高度、淹没区和潮汐带对桥墩横向屈服序列的演化有共同的影响。