核电工程中累积绝对速度阈值保守性评价研究

Study of the conservative evaluation method of cumulative absolute velocity threshold

本文介绍了累积绝对速度标准化计算方法,梳理了核电站地震报警阈值选取原则和现状,统计我国历次地震事件的强震记录,采用标准累积绝对速度计算方法,评价我国核电工程累积绝对速度阈值的保守性。通过计算强震记录峰值加速度与累积绝对速度相关关系,统计分析不同峰值加速度区间内累积绝对速度计算值的分布特征,及其与累积绝对速度0.16 g·s阈值的关系。结果表明:我国强震记录的峰值加速度在0.1~0.15 g区间时,选取0.16 g·s作为核电工程破坏阈值是相对保守的,当PGA小于0.1 g时,该阈值是偏不保守的。

The conservative evaluation method of CAV threshold applied to seismic monitoring in China is analyzed and studied by screening the strong earthquake records of seismic events in China with the method of standard cumulative absolute velocity.By analyzing the correlation between peak acceleration and cumulative absolute velocity,the cumulative absolute velocity is divided into grades,and the distribution characteristics of the calculated value of cumulative absolute velocity in different peak ground acceleration intervals and its relationship with 0.16 g·s threshold are statistically analyzed.The results show that CAV as the damage threshold is relatively conservativein the range of 0.1~0.15 g of peak ground acceleration.When it is greater than 0.15 g,the threshold is too conservative,and when less than 0.1 g,the threshold is not conservative.