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抗震性能分析能够有效估计结构在地震作用下的危险性,逐渐成为抗震安全性评价的重要方法,但由于结构的复杂性,该方法在面板堆石坝方面的应用还处于起步阶段。随着强震区大量高面板堆石坝的建设,这些高坝的安全性是必须要考虑的重大问题,因此对大坝进行抗震性能分析至关重要。增量动力分析(IDA)法作为一种抗震性能分析方法,能够全面、深入地分析在不同强度地震作用下结构性能的变化。本文将IDA法引入到高面板堆石坝安全评价领域,建立了高面板堆石坝地震破坏性能评价方法。根据场地条件选取了15条不同的强震动记录,以地震峰值加速度PGA为地震动参数,采用坝体地震震后变形、坝坡稳定性、面板防渗体安全为抗震性能评价指标,选取合适的性能参数,建议了高面板堆石坝各评价指标的破坏等级划分标准,通过大量非线性有限元计算,得到各性能参数的地震易损性曲线,分析了大坝在不同强度地震作用下发生破坏的概率,成果可为高面板堆石坝抗震性能设计和安全风险评估提供参考和依据。
The analysis of seismic performance can effectively estimate the danger of the structure under the action of earthquake and gradually become an important method of seismic safety evaluation. However, due to the complexity of the structure, the application of the method in the face rockfill dam is still in its infancy. With the construction of a large number of high-face rockfill dam in strong earthquake area, the safety of these high dam is a major problem that must be considered, so it is very important to analyze the seismic performance of dam. As an earthquake resistance analysis method, incremental dynamic analysis (IDA) method can comprehensively and deeply analyze the change of structural performance under different seismic intensity. In this paper, the IDA method is introduced into the field of high rockfill dam safety evaluation, and the evaluation method of seismic failure of high rockfill dam is established. Fifteen different strong motion records were selected according to the site conditions. Based on the seismic peak acceleration (PGA) as the ground motion parameter, the post-seismic deformation of the dam, the stability of the dam slope and the anti-seepage of the anti-seepage body were taken as the evaluation indexes for seismic performance. Performance parameters, the proposed classification criteria for the failure level of each evaluation index of high concrete face rockfill dam, through a large number of nonlinear finite element calculation, the seismic vulnerability curve of each performance parameter is obtained, and the damage of the dam under different seismic intensity is analyzed The results can provide reference and basis for the seismic design and safety risk assessment of high concrete face rockfill dam.