人工地震加速度时程计算方法研究

Study on Calculation of Artificial Seismic Accelerograms

对比研究不同的人工地震加速度时程的计算方法,发现不同方法之间的主要差异在于初始时程的获得方式,包括采用与设计响应谱相近的真实地震过程和基于通过响应谱与功率谱密度间近似关系的方法。基于后一种方法,开发人工地震加速度时程计算程序。采用计算实例进行人工加速度时程计算,得到的人工时程具有良好的形态和统计特征参数;人工时程响应谱与设计谱具有良好的相容性。

The requirements of artificial accelerograms in nuclear power plant seismic design are reviewed, and comparison study is made on the variety of artificial accelerogams generation approach, the main difference about these approaches lies in how to obtain the initial accelerogams, including based on the real earthquake record which has a spectrum similar to design spectrum and the relation between response spectrum and power spectrum density. Using the later approach, a computer code is implemented for the calculation artificial accelerograms, and the calculation for specify design response spectrum is performed. The result shows that the time history has good configuration and statistic parameter to real earthquake record and is highly compatible to the design spectrum. The computer code is suitable for the artificial accelerograms calculation.