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首页> 外文期刊>Earthquake and structures: An International journal of earthquake engineering & earthquake effects on structures >Occurrence mechanism of recent large earthquake ground motions at nuclear power plant sites in japan under soil-structure interaction
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Occurrence mechanism of recent large earthquake ground motions at nuclear power plant sites in japan under soil-structure interaction

机译：土-结构相互作用下日本核电厂近期大地震地震动的发生机理

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摘要

The recent huge earthquake ground motion records in Japan result in the reconsideration of seismic design forces for nuclear power stations from the view point of seismological research. In addition, the seismic design force should be defined also from the view point of structural engineering. In this paper it is shown that one of the occurrence mechanisms of such large acceleration in recent seismic records (recorded in or near massive structures and not free-field ground motions) is due to the interaction between a massive building and its surrounding soil which induces amplification of local mode in the surface soil. Furthermore on-site investigation after earthquakes in the nuclear power stations reveals some damages of soil around the building (cracks, settlement and sand boiling). The influence of plastic behavior of soil is investigated in the context of interaction between the structure and the surrounding soil. Moreover the amplification property of the surface soil is investigated from the seismic records of the Suruga-gulf earthquake in 2009 and the 2011 offthe Pacific coast of Tohoku earthquake in 2011. Two methods are introduced for the analysis of the non-stationary process of ground motions. It is shown that the non-stationary Fourier spectra can detect the temporal change of frequency contents of ground motions and the displacement profile integrated from its acceleration profile is useful to evaluate the seismic behavior of the building and the surrounding soil.
机译：从地震学的角度来看，日本最近的巨大地震地震动记录导致对核电站的地震设计力的重新考虑。另外，还应从结构工程的角度定义抗震设计力。本文表明，在最近的地震记录中（记录在大型结构中或附近，而不是自由场地面运动），如此大的加速度的发生机制之一是由于大型建筑物与其周围土壤之间的相互作用引起的。表层土壤局部模式的放大。此外，核电站地震后的现场调查显示建筑物周围的土壤受到了一些破坏（裂缝，沉降和沙沸）。在结构与周围土壤相互作用的背景下，研究了土壤塑性行为的影响。此外，从2009年的Suruga海湾地震和2011年的东北太平洋地震2011年的地震记录中研究了表层土壤的放大特性。介绍了两种方法来分析地震动的非平稳过程。结果表明，非平稳傅立叶谱可以检测出地震动频率成分的时间变化，其加速度剖面积分得到的位移剖面有助于评估建筑物和周围土壤的地震行为。

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