考虑氯离子侵蚀的盾构隧道结构时变抗震韧性评价研究OA

During long-term service,tunnel structures often face threats such as steel corrosion due to environ-mental erosion,which affects their seismic resilience.To study the evolution law of seismic resilience of shield tunnels under chloride ion erosion,a time-dependent seismic resilience assessment method for tunnels was introduced.Then,the performance degradation law of concrete and steel under chloride ion erosion was analyzed,and a dynamic finite element model considering chloride ion erosion was established.Finally,a time-dependent seismic vulnerability model was developed based on the seismic probabilistic demand model,and a time-dependent seismic resilience analysis method was proposed.The results show that the tunnel seis-mic resilience decreases with the increase of the ground motion intensity.As the service time extends,the seis-mic resilience of the tunnel structure gradually declines,and the probability of severe damage under earth-quakes increases.When the peak ground acceleration is 0.4g,the resilience decreases by 0.5%,2.3%,5.7%,and 11.8%after 25,50,75,and 100 a of service,respectively,compared with the initial state.The findings provide theoretical guidance for monitoring,reinforcement,risk assessment,and post-earthquake res-cue of shield tunnels in high-seismic regions.