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本文叙述河北省玉田和天津市宁河烈度异常区的地面脉动测试情况,并指出由功率谱得到的卓越周期与零交法得到的平均周期并不总是一致的,用后者来描述场地的频率特性更为适当。其次,从脉动记录分析中还将看到,水平分量显示出土质条件的区域性差异,垂直分量可反映表层土的局部构造情况。作者用平均周期、最大合矢量振幅及不同方向的频率差值作场地土质条件评定的指标分别对两个测区按地震效应的好坏进行等级划分,结果与实际震害基本相符。
This paper describes the ground pulsation test of Yutian, Hebei Province and Ninghe, Tianjin, and points out that the excellent period obtained by power spectrum is not always the same as the average period obtained by zero-crossing method. Frequency characteristics more appropriate. Second, as will also be seen from the pulsatile log analysis, the horizontal component shows a regional difference in soil conditions, and the vertical component can reflect the local tectonics of the topsoil. The authors use the average period, the maximum amplitude of the co-vectors and the frequency difference in different directions as the indicators of the soil quality assessment of the site to classify the two test areas according to the earthquake effect. The results are in good agreement with the actual earthquake damage.