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Abstract

To analyze the seismic resilience of cable-stayed bridges under chloride ion erosion, based on the mechanism of chloride ion erosion, this study established a time-varying performance degradation model of reinforced concrete components and cables under the erosion environment, and integrated the theory of seismic vulnerability to construct a framework for assessing the seismic resilience of cable-stayed bridges during their long-term service life. Taking an offshore cable-stayed bridge in China as an engineering example, the study analyzed its seismic vulnerability and seismic resilience under chloride ion erosion. The results show that the seismic vulnerability of the cable-stayed bridge system is higher than that of the main tower, piers, and cables. When the peak ground acceleration aPGA is small, the cables are the most vulnerable, followed by the main tower and piers. When the aPGA is greater than a certain specific value, the vulnerability of the main tower is higher than that of the piers and cables. The seismic resilience index of the cable-stayed bridge shows a nonlinear attenuation trend with the increase of aPGA, and its attenuation rate presents a typical feature of being rapid at first and then slow. When aPGA exceeds the critical threshold, the resilience curve gradually stabilizes, indicating that the structure has entered the limit state of seismic performance under the action of a major earthquake. Chloride ion erosion significantly aggravates the seismic performance degradation of the bridge. Under the condition of aPGA = 0.6g, compared with that of the non-eroded reference state (service for 0 years ), the seismic resilience indices after 20,40,60,80, and 100 years of service decrease by 3.29%, 12.17%, 23.19%, 33.88%, and 41.78%, respectively, showing an obvious time-varying degradation law. The time-varying degradation process of the seismic resilience of the cable-stayed bridge has significant non-uniform characteristics. The average degradation rate in the first 20 years of service is significantly lower than those in the subsequent stages (20‒40,40‒60,60‒80, and 80‒100 years of service ). The research results quantify the evolution law of structural seismic resilience under the coupling effect of chloride ion erosion and ground motion, and can provide a theoretical basis for durability maintenance decision-making and the selection of seismic reinforcement timing of cable-stayed bridges throughout their service life.

Publication Date

10-29-2026

DOI

10.14048/j.issn.1671-2579.2026.05.020

First Page

190

Last Page

198

Submission Date

October 2026

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