Citation: | Zhang Weili, Deng Li, Pang Yutao, Yu Miao, Tian Jianlin, 2022. CIHA Method for Rapid and Accurate Vulnerability Analysis of Embankment Dams under Strong Earthquakes. Earth Science, 47(12): 4390-4400. doi: 10.3799/dqkx.2022.362 |
Earth dams are prone to be instability and failure, resulting in casualties and great social and economic impact under strong earthquakes. Due to the uncertainty of earthquake, the instability analysis of earth dams under strong earthquake is usually expressed by the instability probability. At present, the commonly used method is the seismic vulnerability analysis method, mainly including cloud chart method and incremental dynamic analysis (IDA). The incremental dynamic analysis leads to accurate results but has low computational efficiency, while cloud analysis has high computational efficiency but cannot guarantee the computational accuracy effectively. Therefore, CIHA, a fast and accurate seismic vulnerability analysis method based on cloud analysis and IDA is proposed in this paper. CIHA can give consideration to both calculation efficiency and accuracy. This method is based on the logarithmic linear regression hypothesis of cloud analysis and adopts nonlinear time history analysis. The seismic intensity value under the corresponding damage index is calculated by scaling the seismic wave once, and the fragility curves of earth dam under each damage level is generated based on the mean and variance of these seismic intensity values. The calculation results of the method proposed in this paper are compared with those of IDA through the seismic fragility analysis of Lower San Fernando earth dam. The results show that the practical seismic fragility analysis method can obtain similar results with IDA in terms of accuracy, and the calculation efficiency is significantly improved compared with IDA in terms of calculation efficiency.
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