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PARTICIPATION FACTOR OF SURFACE WAVES AT THE IRREGULAR GROUND DURING THE STRONG EARTHQUAKE

强震期间不规则地面面波参与因子

基本信息

批准号：
15560417
负责人：
MORIO Satoshi
金额：
$ 1.92万
依托单位：
Maizuru National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560417/
关键词：
STRONG EARTHQUAKE SURFACE WAVE PARTICIPATION FACTOR RAYLEIGH WAVE LOVE WAVE DISPERSION CURVE PHASE VELOCITY PARTICLE ORBIT 位相速度レイレイ波群速度

项目摘要

Base on the elastic wave propagation theory, earthquake surface wave is resulted from partly transferred of seismic wave (body wave) which is induced to base layer and experienced irregular ground response. This type of surface wave has been investigated significant active at internal deposition basins in the Kanto Plains and its vicinity area. In fact, in the 1985 Mexico earthquake, great number of multistory buildings collapsed due to seismic wave as the interference of long period component in the Mexican deposition basin. Then, in the 1995 Hyogoken-Nambu earthquake, huge damage concentrated in the area located along 1-1.5km laterally from its active fault. It was also investigated that the main factor of those earthquake damage was caused by the interference among body wave under base layer and its lateral transferred wave.Although the irregular ground earthquake response is analyzed using FEM analysis even by taking into account thin-layered-element-method and boundary element met … More hod, it is difficult to differ surface wave from body wave. However, it is important to make another attempt to study the fraction among body wave and surface wave from the FEM analysis result by using numerical analysis, in order to understand the seismic response properties of irregular ground.Since the period of surface wave is longer than the period of body wave, structures whose long natural periods (about 1-10 sec), such as long-span bridges and high-rise buildings, will suffer greater response due to surface wave. Moreover, the investigation on the surface wave is considered necessary in providing a more rational paradigm in designing longer bridges and higher buildings.In this research, the participation factor of Rayleigh wave in seismic response of irregular ground is assessed quantitatively on the result of 2D FEM analysis. The case study is performed to analyze the response of the 1995 Hyogoken-Nambu earthquake N-S section to its disaster belt. As the result, it is confirmed that the participation factor of Rayleigh wave is clearly investigated. Less

根据弹性波传播理论，地震表面波是由地震波（体波）部分传递到基层并经历不规则地面反应而产生的。这种表面波在关东平原及其邻近地区的内部沉积盆地中被研究过。事实上，在1985年墨西哥地震中，墨西哥沉积盆地由于地震波的长周期分量的干扰，造成了大量多层建筑的倒塌。然后，在1995年的小古根-南部地震中，巨大的破坏集中在活动断层横向1-1.5公里的区域。分析了地震破坏的主要因素是基底层体波与其横向传递波之间的相互干扰。虽然用有限元法分析不规则地震动反应时，即使考虑了薄层单元法和边界单元法，但面波和体波难以区分。然而，为了更好地了解不规则地基的地震反应特性，有必要对有限元分析结果中体波与面波的比例进行数值分析。由于面波的周期比体波的周期长，所以自然周期较长的结构（约1-10秒），如大跨度桥梁和高层建筑，在面波作用下会受到更大的响应。此外，表面波的研究被认为是必要的，为设计更长的桥梁和更高的建筑提供更合理的范例。本文在二维有限元分析结果的基础上，定量评价了瑞利波对不规则地基地震反应的参与系数。以1995年小古根-南部地震为例，分析了地震南北向剖面对其灾害带的响应。结果表明，对瑞雷波的参与因素进行了较为清晰的研究。少