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首页> 外文期刊>Bulletin of earthquake engineering >Urban seismic stations: soil-structure interaction assessment by spectral ratio analyses
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Urban seismic stations: soil-structure interaction assessment by spectral ratio analyses

机译：城市地震台站：通过光谱比分析评估土壤与结构的相互作用

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In this work we present and discuss the results of ambient seismic noise analyses computed at four sites where seismic stations, managed by the INGV (Italian Institute for Geophysics and Vulcanology) and the DPC (Italian Department of Civil Protection), are installed inside buildings. The experiments were performed considering different types of installation: sensor located at the bottom of a school, directly installed on rock (case 1); sensor located at the bottom of a medieval fortress, built on an isolate hill, directly installed on rock (case 2); sensor installed on the foundations of a medieval fortress, built on an isolate hill (case 3); sensor installed on the foundations of a school, built on alluvial deposits (case 4). Since recent works proposed the use of spectral ratio techniques to study the dynamic characterization of buildings, ambient seismic-noise measurements were performed for each site close to the stations (at the base of the structures), at the top of the structures and outside the buildings. In order to check the source of vibrations both horizontal to vertical spectral ratio (HVNR) and standard spectral ratio (SSR) techniques were applied. For all stations the results from ambient seismic noise were compared to those obtained from earthquakes (HVSR). In order to detect preferential directions of amplification, for each site average HVNRs and HVSRs were computed considering one azimuth for each set of 5A degrees. We obtain different results for different types of installation: in cases 1 and 2, where the sensors are directly installed on rock, the vibrations of the structure do not affect the noise measures performed close to the stations, which show flat HVNR in the whole frequency range: in both cases the eigenfrequency of the building is given by the HVNR calculated from the measures performed at the top of the structure. In cases 3 and 4, where the sensors are installed on the foundations of the considered structures, both the amplification peaks between 5 and 9 Hz (case 3) and between 5.5 and 7 Hz (case 4) include the contribution of the free oscillations of the buildings. In particular, in case 4, HVNRs performed outside building highlight possible soil-structure resonance effects in case of an earthquake.
机译：在这项工作中，我们介绍并讨论在四个地点（由INGV（意大利地球物理和火山学研究所）和DPC（意大利民防局）管理的地震台）安装在建筑物内的四个地点计算的环境地震噪声的分析结果。实验是根据不同的安装类型进行的：传感器位于学校底部，直接安装在岩石上（案例1）;传感器位于中世纪堡垒底部，建在一个孤立的小山上，直接安装在岩石上（案例2）;传感器安装在一座中世纪堡垒的地基上，建在一个孤立的小山上（案例3）;传感器安装在学校的地基上，建在冲积层上（案例4）。由于最近的工作提出使用频谱比率技术来研究建筑物的动态特性，因此对靠近站点（结构底部），结构顶部和外部的每个站点进行了环境地震噪声测量。建筑物。为了检查振动源，同时应用了水平与垂直频谱比（HVNR）和标准频谱比（SSR）技术。对于所有站点，将环境地震噪声的结果与地震（HVSR）的结果进行了比较。为了检测优先的扩增方向，考虑到每组5A度的一个方位角，针对每个位点计算了平均HVNR和HVSR。对于不同类型的安装，我们获得不同的结果：在情况1和2中，将传感器直接安装在岩石上，结构的振动不会影响靠近站台执行的噪声测量，在整个频率上均显示出平坦的HVNR范围：在两种情况下，建筑物的固有频率均由HVNR给出，而HVNR是根据结构顶部的测量值计算得出的。在情况3和4中，将传感器安装在所考虑结构的基础上，在5和9 Hz之间（情况3）和在5.5和7 Hz之间（情况4）的放大峰值都包含了自由振动的贡献。那些建筑。特别是在情况4中，在建筑物外执行的HVNR突出显示了地震时可能发生的土壤结构共振效应。

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