期刊
UNDERGROUND SPACE
卷 7, 期 2, 页码 242-253出版社
KEAI PUBLISHING LTD
DOI: 10.1016/j.undsp.2021.07.007
关键词
Circular tunnels; Fragility curves; Artificial neural network; Numerical study; Probabilistic seismic demand model
资金
- National Natural Science Foundation of China [52108381, 52090082, 41772295, 51978517]
- Innovation Program of Shanghai Municipal Education Commission [2019-01-07-00-07-456 E00051]
- key innovation team program of innovation talents promotion plan by MOST of China [2016RA4059]
This paper presents a probabilistic framework based on an artificial neural network (ANN) for the seismic fragility assessment of circular tunnels in soft soils. The proposed approach considers soil-structure interaction and ground motion characteristics, resulting in reliable fragility models with a lower computational cost compared to traditional linear regression models.
Recent earthquakes have shown that tunnels are prone to damage, posing a major threat to safety and having major cascading and socioeconomic impacts. Therefore, reliable models are needed for the seismic fragility assessment of underground structures and the quantitative evaluation of expected losses. Based on previous researches, this paper presented a probabilistic framework based on an artificial neural network (ANN), aiming at the development of fragility curves for circular tunnels in soft soils. Initially, a twodimensional incremental dynamic analysis of the nonlinear soil-tunnel system was performed to estimate the response of the tunnel under ground shaking. The effects of soil-structure-interaction and the ground motion characteristics on the seismic response and the fragility of tunnels were adequately considered within the proposed framework. An ANN was employed to develop a probabilistic seismic demand model, and its results were compared with the traditional linear regression models. Fragility curves were generated for various damage states, accounting for the associated uncertainties. The results indicate that the proposed ANN-based probabilistic framework can results in reliable fragility models, having similar capabilities as the traditional approaches, and a lower computational cost is required. The proposed fragility models can be adopted for the risk analysis of typical circular tunnel in soft soils subjected to seismic loading, and they are expected to facilitate decision-making and risk management toward more resilient transport infrastructure.
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