中国地震安全性评价中天然强震记录选取

Real strong ground-motion selection for Chinese seismic safety evaluation work

摘要:

为解决目前中国地震安全性评价中天然强震记录选取的问题，基于条件均值目标谱的概念，从中国地震安全性评价的已有结果出发，同时考虑震级、距离和地震动离散性，对危险性分析结果进行设定地震解耦，构建了反映结构特征和地震动特征的条件均值目标谱，为天然强震记录的选取提供匹配依据.安全性评价实例的强震记录结果表明, 本文建议方法在保证选取物理意义与设定地震相符的前提下较好兼顾了全周期段的谱形匹配，均值偏差和离散性水平均较低.最后给出适用于中国地震安全性评价工作的天然强震记录选取建议流程，所得结果可为结构时程分析与抗震验算提供参考.

Abstract:

To select real strong motions for Chinese seismic safety evaluation work, we disaggregated the result of Chinese seismic safety evaluation work into specified earthquake scenarios considering magnitude, distance and earthquake variation, and then the condition median spectrum was constructed as strong motion selection target. The results based on conditional mean spectrum was compared with uniform spectrum matching result for a real safety evaluation project. The comparison result indicates that the result from the proposed method is consistent with target earthquake scenario, and the proposed method preforms better in matching spectrum shape within the whole period. Finally, a practical real ground motion selection method was proposed for Chinese seismic safety evaluation work.