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Seismic Risk Probability Assessment of Offshore Bridge Based on the Material Degradation

机译：基于材料降解的海上桥梁地震风险概率评估

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In order to analyze the effect of chloride corrosion on seismic performance of bridge structures, a methodology is proposed to evaluate the seismic risk probability of offshore bridges considering the material degradation in marine environment. The numerical model of a continuous concrete reinforcement bridge is established by finite element software of OpenSees. The random samples of longitudinal reinforcement diameter, yield strength, stirrups diameter and cover concrete compressive strength of corroded piers under different service time are obtained based on the probabilistic method. The set of samples combining ground motion and bridge is formed. The damage states capacity of bridge piers is analyzed by the Pushover analysis. The incremental dynamic analysis of bridge is carried out. The seismic vulnerability analysis is carried out for each component and the whole system of the bridge. According to the site type, the seismic hazard curves of bridge structures in different service time are obtained by the equal transcendental probability theory and the existing seismic hazard model. Monte Carlo method is used to generate random samples of ground motions in different service time. The seismic risk probability of the offshore bridge can be evaluated based on the seismic vulnerability analysis and the seismic hazard evaluation. The results showed that the performance of reinforced concrete degraded and became progressively worse with advancing service time. The corrosion of stirrup resulted in a significant decrease in shear capacity of the pier. The failure mode of corroded pier is changed. The influence of shear deformation should be considered when establishing the finite element model of corroded pier. Considering the degradation of material properties caused by chloride ion erosion, the seismic risk probability of longitudinal and transverse damage of bridge system decreases with the increase of service time. The risk probability is about 25% higher than the bridge without material degradation.
机译：为了分析氯化物腐蚀对桥梁结构抗震性能的影响，提出了一种考虑海洋环境物质降解的海上桥梁地震风险概率评估方法。用OpenSees有限元软件建立了连续混凝土钢筋桥梁的数值模型。基于概率方法，获得了不同工作时间下锈蚀墩墩的纵向钢筋直径，屈服强度，箍筋直径和覆盖混凝土抗压强度的随机样本。形成了一组将地震动和桥相结合的样本。通过Pushover分析法分析了桥墩的破坏状态能力。进行了桥梁的增量动力分析。对桥梁的每个组成部分和整个系统进行地震易损性分析。根据场地类型，通过等先验概率理论和现有的地震危险模型，得出了桥梁结构在不同使用时间的地震危险曲线。蒙特卡罗方法用于生成不同服务时间内地面运动的随机样本。可以基于地震易损性分析和地震危险性评估来评估海上桥梁的地震风险概率。结果表明，随着使用时间的延长，钢筋混凝土的性能下降，并逐渐恶化。箍筋的腐蚀导致墩的剪切能力显着下降。锈蚀墩的破坏方式改变了。建立腐蚀墩的有限元模型时，应考虑剪切变形的影响。考虑到氯离子腐蚀引起的材料性能下降，桥梁系统的纵向和横向破坏的地震风险概率随使用时间的增加而降低。风险概率比没有材料降级的桥梁高约25％。

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