Non-stationary random seismic response of asphalt concrete core wall

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (9) : 298-308.

WANG Zongkai, SONG Zhiqiang, LIU Yunhe

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Abstract

Because of its good environmental adaptability, the asphalt concrete core dam is the finest dam type for the deep overburden site in southwest China's strong seismic zone. Unfortunately, research on the seismic safety evaluation of asphalt concrete core dams under non-stationary random earthquake action is relatively limited. The modified Clough-Penzien power spectrum combined with a random function is utilized in this research to construct a series of non-stationary random ground motion sets that fit the response spectrum while taking into account the non-stationary properties of ground motion frequency and intensity. The mean value and variation range of the horizontal acceleration and vertical permanent deformation of the dam crest are statistically evaluated and tested using an asphalt concrete core dam on a deep overburden layer as an example. The mean value and variability of the response of the overburden and the dam body along elevation are revealed, and the probability density evolution method is used to expose the evolution process of the probability density of the horizontal acceleration of the dam crest over time. At the same time, 55 non-stationary random ground motions generated are magnified and the non-stationary random seismic vulnerability curve of asphalt concrete core dam on deep overburden is developed by combining MSA vulnerability analysis method. The vulnerability curve of dam body with collapse rate as control index of damage level is given. It provides a new method and idea for seismic safety evaluation of asphalt concrete core dam on deep overburden.

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asphalt concrete core dam / deep overburden / non-stationary random ground motion / dynamic response / vulnerability analysis

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WANG Zongkai, SONG Zhiqiang, LIU Yunhe. Non-stationary random seismic response of asphalt concrete core wall[J]. Journal of Vibration and Shock, 2024, 43(9): 298-308

References

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