Abstract
In this paper, the concrete carbonation and chloride-induced corrosion of bridge structure in the service period under the offshore environment were comprehensively considered. Based on the time-varying degradation effect of mechanical properties of materials and continuous damage model, the time-varying seismic fragility of bridge components was analyzed with using incremental dynamic analysis. The time-varying brittleness curves of the bridge system and components were established according to the results of the analysis. According to the analysis of the time-varying fragility of the structure in the complete damage state, the collapse working conditions of the bridge structure and a method of quantifying the fragility coefficient were proposed. The results show that the fragility coefficient of the bridge system is higher than that of the components in the whole life cycle, and all of them increase with the increase of the bridge service cycle. When the peak acceleration of ground is small, the removing of 1# pier is more fragile. When reaching the design service life, the fragility coefficient of the bridge system is about 30% higher than that of the original state. The fragility coefficient of the bridge system in removing of 1# is the maximum value between three working conditions.
Highlights
Due to the influence of concrete carbonation and chloride-induced corrosion, the seismic performance of reinforced concrete bridge decreases continuously in the whole life cycle [1,2].For the bridge located in the seismic belt, the durability damage will cause the change of dynamic characteristics and seismic response due to the decreasing of seismic performance and the change of bridge structure stiffness and damping, which increase the level of its damage state under earthquake.the reinforced concrete bridge that reaches the requirements of seismic design in the original state may not maintain safe operation in the earthquake disaster.In recent years, the influence of durability damage on the seismic performance of concrete structure has been paid more and more attention
The results show that the fragility of bridge system assessment by the first-order bounds could lead to errors of up to 40% when the fragility of bridge system is higher than that of any individual component
Considering that 2#, 3#, and 5# piers will not reach complete damage in the whole service period, the subsequent analysis of collapse resistance conditions is shown in Table 4 and the subsequent analysis of collapse resistance performance of the bridge system should meet the following tow assumptions
Summary
Due to the influence of concrete carbonation and chloride-induced corrosion, the seismic performance of reinforced concrete bridge decreases continuously in the whole life cycle [1,2]. He et al [8] dynamically and deeply simulated the durability evolution process of the reinforced concrete structure after the coupling of chloride-induced corrosion and carbonation effects. Choe et al [16,17] proposed a probabilistic method of time-variant chloride-induced corrosion that is applied to reinforced concrete columns, and considered the reduction of their seismic performance. The authors considered the impact of flood scour, reinforcement bars corrosion and the concrete cover cracking on seismic fragility These studies mainly discussed the time-variant seismic fragility of individual components. This paper adopts performance-based seismic design and fragility analysis method [23], considering the structure within the whole life cycle of concrete carbonation and chloride-induced corrosion. Based on this method, the fragile component and collapse resistance condition of the bridge is obtained, which can provide a reference for seismic analysis, evaluation, and maintenance
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