Seismic vulnerability analysis of tunnel based on modified IDA method

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (17) : 106-115.

DONG Zhengfang1,2, LIU Ganzhi1, ZENG Fankai3, KANG Shuai1

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Abstract

Here, to study seismic capacity of a tunnel, the probabilistic seismic demand model was obtained with the modified
incremental dynamic analysis (IDA) method.The structural failure probability under each seismic intensity was obtained by combining engineering demand parameters’ limit values with the probabilistic seismic demand model, and the seismic fragility curve of the structure was obtained to evaluate the seismic behavior of the tunnel.Taking a typical underground pipe gallery and a shield tunnel as examples, their finite element models were established using SAP2000 software, and 12 working conditions were set up to discuss effects of site type, buried depth and section size on seismic capacity of tunnels with different structure types.The results showed that site type has the largest influence on damage degree of tunnel structure, the structural danger degree of the site type IV is the largest; tunnel structure has better seismic capacity in its elastic-plastic working stage; tunnel structure with large buried depth is more dangerous than that with small buried depth; tunnel structure with large cross-section is more dangerous than that with small cross-section.

Key words

tunnel engineering / underground structure / incremental dynamic analysis (IDA) / seismic fragility analysis / seismic behavior

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DONG Zhengfang, LIU Ganzhi, ZENG Fankai, KANG Shuai. Seismic vulnerability analysis of tunnel based on modified IDA method[J]. Journal of Vibration and Shock, 2021, 40(17): 106-115

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