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http://dx.doi.org/10.9711/KTAJ.2022.24.1.001

Evaluation of seismic fragility models for cut-and-cover railway tunnels  

Yang, Seunghoon (Dept. of Civil, Environmental and System Engineering, Hanyang University)
Kwak, Dongyoup (Dept. of Civil and Environmental Engineering, Hanyang University ERICA)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.24, no.1, 2022 , pp. 1-13 More about this Journal
Abstract
A weighted linear combination of seismic fragility models previously developed for cut-and-cover railway tunnels was presented and the appropriateness of the combined model was evaluated. The seismic fragility function is expressed in the form of a cumulative probability function of the lognormal distribution based on the peak ground acceleration. The model uncertainty can be reduced by combining models independently developed. Equal weight is applied to four models. The new seismic fragility function was developed for each damage level by determining the median and standard deviation, which are model metrics. Comparing fragility curves developed for other bored tunnels, cut-and-cover tunnels for high-speed railway system have a similar level of fragility. We postulated that this is due to the high seismic design standard for high-speed railway tunnel.
Keywords
Cut-and-cover railway tunnel; Weighted linear combination; Empirical method; Probability of damage occurrence; Seismic fragility function;
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