【摘要】 使用单点地脉动谱比法(Nakamura方法),对3个昆明地震动强度(烈度)观测台的基墩和场地自由表面进行了谱比分析,通过分析谱比的卓越周期和放大因子,研究了基墩对地震波的影响和Nakamura方法对地层分析的可靠性。结果表明(1)基墩对低频部分基本没有影响,对高频部分稍微有放大;(2)Nakamura方法对地层的分析和钻孔法所得的结果在某些层位较一致。更多还原

【Abstract】 We used Nakamura Method to analyze the spectra ratio of horizontal to vertical directions between concrete pad and earth ground at three strong motion stations in Kunming, studied the effect of concrete pad on seismic motion and the reliability of using Nakamura Method to analyze strata. The result shows: (1) the concrete pads don’t influence the low frequency part of ground motion, but magnify the high frequency part slightly; (2) the results from Nakamura Method and borehole surveying are consistent at some bed depths.更多还原