An Experimental Study on Engineering Characteristics of Spatial Correlation of Earthquake Ground Motion

地震地震动空间相关性工程特性试验研究

• 批准号: 59420034
• 负责人: KATAYAMA Tsuneo
• 金额: $ 9.6万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1984
• 资助国家: 日本
• 起止时间: 1984 至 1985
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-59420034/
• 关键词: Earthquake; Earthquake.Ground Motion; Seismograph Array; Displacement Seismograph; 速度型地震計

In spite of its engineering importance, spatial correlation of earthquake ground motion over a distance of several hundreds of meters has not been studied in detail. In order to experimentally examine the abovementioned properties from the engineering point of view, the following observation system has been constructed in the Chiba Experiment Station of the University of Tokyo.1) By installing eight 3-component acceleration-type seismographs on and in the ground (-1m and -20m, respectively), the previously existing dense array network has been expanded to a system of 44 seismographs with a total number of 132 components within a triangular area with sides of about 300m. By this expansion, spatial correlation characteristics of ground motions over distances of 300m, 150m, 120m, 30m, 15m, 10m and 5m can be investigated based on actually observed seismograms.2) A JMA (Japan Meteorological Agency) displacement-type seismograph (2 horiz. and 1 vert. components) and three velocity-type seism … More ographs(2 horiz. and 1 vert.) with wide dynamic range have been installed together with a borehole acceleration-type seismograph (2 horiz. and 1 vert. components) at the same place to examine the reliability of displacement time-histories obtained by integration of the records of acceleration- type seismograph.Since the total observation system began to operate only in December, 1985, complete sets of satisfactory records are yet to be obtained. However, some interesting findings have been made by using the data so far recorded.1) The displacement waveform computed by double integration of accelero gram was found to agree with that recorded by the JMA displacement-type seismograph for the components of waves in the period range of 2 - 13s.2) Agreement between ground motions recorded by acceleration-type and velocity-type seismographs was found satisfactory at least for the components of waves with periods longer than 4s.3) From the two of the strongest array records so far obtained, the peak acceleration on the ground surface was found to vary with a coefficient of variation of 20% within the 300m triangular area whose geological conditions are almost uniform. This seems to indicate an important direction of future research related to the spatial correlation of ground motion. Less

尽管它具有重要的工程意义，但数百米范围内的地震地面运动的空间相关性还没有得到详细的研究。为了从工程角度对上述特性进行实验检验，在东京大学千叶实验站建立了如下观测系统：1)通过在地面和地面(分别为-1m和-20m)安装8台三分量加速度型地震仪，将原来的密集阵网扩展到一个三角形区域内的44个地震仪系统，总共有132个分量，边长约300米。通过这种展开式，可以根据实际观测的地震记录来研究300m、150m、120m、30m、15m、10m和5m距离上的地面运动的空间相关性特征。和1vert.分量)和三个速度型地震…更多图表(2小时。和1个版本。)与井下加速型地震仪(2赫兹)一起安装，动态范围宽。和1vert.由于整个观测系统在1985年12月才开始运行，至今仍未获得令人满意的成套记录。然而，利用迄今记录的数据得到了一些有趣的发现：1)对于周期为2-13的波分量，通过加速图的双积分计算的位移波形与JMA位移型地震仪记录的位移波形一致。2)至少对于周期大于4的波分量，由加速型地震仪记录的地面运动之间的一致性是令人满意的。3)从迄今获得的两个最强的阵列记录，在地质条件基本一致的300m三角形范围内，地表加速度峰值变化的变异系数为20%。这似乎预示着与地面运动空间相关性相关的未来研究的一个重要方向。较少

项目成果

土木学会第40回年次学術講演会講演概要集 第1部. (1985)

第40届日本土木学会学术会议摘要集第1部分（1985年）

第18回地震工学研究発表会講演概要. (1985)

第十八届地震工程研究会议摘要（1985）。

Bull.of Earthquake Resistant Structure Research Center. No.19. (1986)

抗震结构研究中心公报。

Proc. 13th AIJ Symposium on Ground Vibration (1985). (1985)

过程。

Bulletin of Earthquake Resistant Structure Res. Center. No.19. (1986)

抗震结构研究通报。