深厚覆盖层上沥青混凝土心墙坝非平稳随机地震动响应分析

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (9) : 298-308.

论文

王宗凯，宋志强，刘云贺

作者信息 +

Non-stationary random seismic response of asphalt concrete core wall

WANG Zongkai, SONG Zhiqiang, LIU Yunhe

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摘要

沥青混凝土心墙坝由于良好的环境适应能力是我国西南强震区深厚覆盖层场地的优选坝型，然而对于沥青混凝土心墙坝非平稳随机地震作用下的抗震安全评价研究尚有不足。本文采用改进的Clough-Penzien功率谱结合随机函数，充分考虑地震动频率与强度的非平稳特征，生成了一系列与反应谱拟合的非平稳随机地震动集合，以某深厚覆盖层上沥青混凝土心墙坝为例，对其坝顶水平加速度及竖向永久变形等响应的均值及变化范围等进行了统计分析及分布检验，揭示了覆盖层与坝体响应均值及变异性沿高程变化规律，并通过概率密度演化方法，展示了坝顶水平加速度概率密度沿时间的演化过程，同时对生成的55条非平稳随机地震动进行调幅，结合MSA易损性分析方法开展了深厚覆盖层上沥青混凝土心墙坝非平稳随机地震动易损性分析，给出了以震陷率为破坏等级控制指标的坝体易损性曲线，为深厚覆盖层上沥青混凝土心墙坝的抗震安全评价提供了新的方法和思路。

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.

导出引用

王宗凯，宋志强，刘云贺. 深厚覆盖层上沥青混凝土心墙坝非平稳随机地震动响应分析[J]. 振动与冲击, 2024, 43(9): 298-308

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

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