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基于H/V谱比法的场地分类研究
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摘要
利用搜集整理的美国西部地区166个有详细钻孔资料的台站场地上的强震记录1546组,按照我国建筑抗震设计规范中场地类别划分标准对台站进行了场地分类。统计分析了各类场地上谱比曲线随震级、震中距的变化特征,验证了H/V谱比法用于场地分类的可行性。通过H/V谱比法统计出对应于我国抗震设计规范中Ⅰ、Ⅱ、Ⅲ类场地上的标准谱比曲线,为我国强震台站基于H/V谱比法进行场地分类提供参考。提出用谱比峰值和0.50s~0.65s处谱比值作为谱比法用于场地分类的指标,研究结果表明,该两项指标对Ⅱ类和Ⅲ类场地划分的正确率较高。
The 1546 strong motion records from 166 sites with detailed borehole data in the WesternUnited States are collected.The station sites are sorted according to the site classification standards of the Chinese code for seismic design of building.Statistical analysis the magnitude and the epicentral distance which influences the curve of horizontal to vertical spectral ration on different sites.The feasibility of H/V spectral ratio method is used for site classification are verified.The standard spectral ratio curves on each sites are calculated based on the H/V spectral ratio method.Then the method could be provided reference to study the site classification of Chinese strong—motion stations.An indicators of site classification was proposed based on the peak value of spectral ratio and the value of spectral ratio from 0.50 to 0.65 seconds.The results show that the two indicators have more higher accuracy on siteⅡ,Ⅲ class.
引文
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