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Damage demand assessment of mainshock-damaged concrete gravity dams subjected to aftershocks

机译：余震对主震混凝土重力坝的破坏需求评估

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In China, the current seismic codes specify a single earthquake event as the design seismic load for concrete gravity dams. However, a large mainshock usually triggers numerous aftershocks in a short period. This paper assesses the effects of aftershocks on concrete gravity dam-reservoir-foundation systems and provides a quantitative description of the damage demands prior to and following the aftershocks. For this purpose, a set of 20 as-recorded mainshock-aftershock seismic sequences is considered in this study. The correlation between the ground motion characteristics of the as-recorded mainshocks and those of the aftershocks is examined. In order to identify the influence of the ground motion characteristics of aftershocks on the damage demands of the mainshock-damaged dams, the nonlinear behavior of the concrete gravity dams that are subjected to single seismic events and typical as-recorded seismic sequences is compared in terms of the structural damage, displacement response, and damage dissipated energy. A series of nonlinear dynamic analyses is performed to quantify the influence of aftershocks, which are selected by using different methods, on the damage demands of concrete gravity dam-reservoir-foundation systems in terms of the local and global damage indices. The results show that the aftershocks lead to an increase in the damage demands of the dam at the end of the seismic sequence when the concrete gravity dam is already damaged during the first individual seismic event and has not been repaired. In addition, the results also reveal that the repeated seismic sequences tend to underestimate the level of damage demands.
机译：在中国，当前的地震法规将单个地震事件指定为混凝土重力坝的设计地震荷载。但是，大的主震通常会在短时间内引发大量余震。本文评估了余震对混凝土重力坝-水库-基础系统的影响，并定量描述了余震前后的破坏需求。为此，本研究考虑了一组20个已记录的主震-余震地震序列。研究了记录的主震与余震的地面运动特征之间的相关性。为了确定余震的地面运动特征对主震破坏水坝的破坏要求的影响，比较了遭受单个地震事件和典型记录地震序列的混凝土重力坝的非线性行为。结构破坏，位移响应和破坏耗能。进行了一系列非线性动力学分析，以局部和全局破坏指标来量化通过不同方法选择的余震对混凝土重力坝-水库-基础系统的破坏需求的影响。结果表明，当混凝土重力坝在第一个单独的地震事件中已经损坏并且尚未修复时，余震导致在地震序列结束时对坝的破坏需求增加。此外，结果还表明，重复的地震序列往往会低估破坏需求的水平。

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