我国地震反应谱影响因素分析

Analysis of Effects of Several Factors on the Ground Motion in China

本文利用我国海城、唐山的175条水平加速度地震记录,统计分析了场地条件、震级和震中距三个因素对标准化反应谱的影响,并采用“移动平均法”验证了它们的关系;表明不同周期β的概率分布符合对数正态分布;也说明场地条件和震级是影响我国加速度反应谱形状的主要因素。最后,还与美国西部的138条地震记录的计算结果作了比较。从而对我国的抗震设计提出了建议。

175 horizontal accelerograms had been obtained during the Heicheng and the Tang-shan earthquakes. The effects of local soil conditions, seismic magnitudes and epicentral distances on the normalized response spectra were studied by means of the statistical analysis and their relations were examined by 'the moving average method'. The probabilistic distribution of β in the different periods is in good agreement with Jog-normal distribution. The results show that there are significant effects of the soil condition and the earthquake magnitude on the response spectra. Finally, 138 earthquake records in the western region of the U.S. were taken to compare with those obtained in China. As a results, some suggestions for aseismic design ia China are presented.