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地震易损性分析是地震风险分析的重要组成部分,可以预测结构在遭受不同等级地震荷载作用下发生各级破损的概率。土石坝在地震作用下易发生不同程度的破坏,对其进行易损性分析可以为土石坝地震风险分析及评价提供有效途径。考虑土石坝材料参数及地震动输入不确定性因素的影响,提出了基于变形的土石坝地震易损性分析方法。采用正交设计法选取材料参数样本组合,分别施加不同地震峰值加速度进行地震反应分析,基于坝顶相对沉陷破损评价指标,给出了大坝的易损性曲线。以云鹏心墙土石坝为例进行了地震易损性分析,得到大坝不同震损等级的风险概率,对土石坝地震风险评估和抗震设计优化、维修加固决策等具有重要意义和应用价值。
Seismic vulnerability analysis is an important part of seismic risk analysis, and can predict the probability of structural damage at all levels subject to different levels of seismic loading. The earth-rock dam is prone to damage to varying degrees under the earthquake. The vulnerability analysis of the earth-rock dam can provide an effective way for the earth-rock dam seismic risk analysis and evaluation. Considering the material parameters of earth-rock dam and the influence of the uncertainty of ground motion input, a method of seismic vulnerability analysis of earth-rock dam based on deformation is proposed. The orthogonal design method is adopted to select the material parameter sample combination, and different seismic peak accelerations are respectively applied for seismic response analysis. Based on the evaluation index of relative subsidence and damage at dam crest, the dam vulnerability curve is given. Taking Yunpeng earth-rock dam as an example, the vulnerability analysis of earthquakes is carried out, and the risk probability of dam with different earthquake damage levels is obtained, which is of great significance and application value to earthquake risk assessment of earth-rock dam, seismic design optimization and maintenance and reinforcement decision-making.