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本文通过对河北省廊坊、万庄、桐柏、迁安、新庄、乐亭、王滩,江苏省江阴等八个工程场地影响烈度的频次分布情况进行分析,发现工程场地的影响烈度与相应频次之间存在对数直线关系。根据这种对数直线关系可以得到工程场地各烈度的年平均发生率,进而可以对场地在未来50年、100年可能遭遇到的烈度进行预测。其预测结果与烈度复核和地震危险性分析的结果是十分相近的。因此,只要工程场地所在地区有足够多的历史地震资料,就可以利用场地影响烈度的频次分布特征来评价工程场地的地震危险性。
Based on the analysis of frequency distribution of impact intensity of eight project sites in Langfang, Wanzhuang, Tongbai, Qian’an, Xinzhuang, Laoting, Wangtan and Jiangyin in Jiangsu Province, it is found that the influence intensity of project site and the corresponding frequency There is a logarithmic line between. According to this logarithmic linear relationship, the average annual incidence of each intensity of the project site can be obtained, and the intensity of the site that may be encountered in the next 50 years and 100 years can be predicted. The result of the prediction is very similar to the result of the intensity check and seismic hazard analysis. Therefore, as long as there are enough historical seismic data in the area where the project site is located, the seismic hazard of the project site can be evaluated by using the frequency distribution of site-influenced intensity.