Seismic fragility assessment of high earth-rockfill dams considering the seismic wave randomness and water level

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (6) : 67-74.

JIN Congcong1,2 CHI Shichun1,2 NIE Zhangbo1,2

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Abstract

Considering the number of input ground motions and the fluid-solid coupling of high earth rock dams under different water levels, the dynamic analysis of a high earth rock dam in China was carried out by using an elasto-plastic model and nonlinear finite element method. Then the seismic fragility assessment of the dam was investigated based on the multi samples analysis(MSA) method. 40 seismic waves were selected according to the site condition, and the earthquake damage level of the high earth rock dam was divided. The relative seismic subsidence rate of the dam was selected as the index of the fragility limit state. The dynamic consolidation finite element program SWANDYNE Ⅱ was used in the dynamic analysis of the dam, and the seismic fragility curve was obtained by the MSA method. Through analyzing the fragility equation parameters under different seismic waves, the appropriate number of seismic waves was determined. Through the 3D fragility curves of the high earth rock dam considering the influences of different water level and ground motion, it is shown that the damage probability under different damage levels increases with the rise of water level under the same earthquake. Considering the influences of different water level and seismic waves, the results provide a reference to the seismic safety assessment of high earth rock dams.

Key words

MSA approach / seismic fragility / SWANDYNE II program / Failure probability

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JIN Congcong1,2 CHI Shichun1,2 NIE Zhangbo1,2 . Seismic fragility assessment of high earth-rockfill dams considering the seismic wave randomness and water level[J]. Journal of Vibration and Shock, 2019, 38(6): 67-74

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