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首页> 外文期刊>Bulletin of earthquake engineering >Quantification of the amplitude variability of the ground motion in Argostoli, Greece. Variability of linear and non-linear structural response of a single degree of freedom system.
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Quantification of the amplitude variability of the ground motion in Argostoli, Greece. Variability of linear and non-linear structural response of a single degree of freedom system.

机译：希腊阿格多利地面运动幅度变异的量化。 单一自由度系统的线性和非线性结构响应的可变性。

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摘要

The term "spatial variability of seismic ground motions" denotes the differences in the amplitude and phase content of seismic motions. The effect of such spatial variability on the structural response is still an open issue. In-situ experiments may be helpful in order to answer the questions regarding both the quantification of the spatial variability of the ground motion within the dimensions of a structure as well as the effect on its dynamic response. The goal of the present study is to quantify the variability of the seismic ground motion accelerations in the shallow sedimentary basin of Argostoli, Greece, and thereafter to identify its effect on the linear and non-linear elasto-plastic response of a single degree of freedom system in terms of spectral displacements. Around 400 earthquakes are used, recorded by the 21-element very dense seismological array deployed in Argostoli with inter-station spacing ranging from 5 to 160 meters. The seismic motion variability, evaluated in terms of spectral accelerations, is found to be significant and to increase with inter-station distance and frequency. Thereafter, the amplitude variability in terms of spectral displacements, which is indeed the linear response of a single degree of freedom (SDOF) system with various fundamental periods, is compared with the amplitude variability of a SDOF with non-linear elasto-plastic response. The variability of the maximum top displacement of the linear single degree of freedom system is estimated to be on average 12% with larger variabilities to be observed within two narrow frequency ranges (between 1.5 and 1.7 Hz and between 3 and 4 Hz). Such high variabilities are caused by locally edge-generated diffracted surface waves. The non-linear perfectly elasto-platic structural response of the SDOF system shows that although the variability has the same trends as in the case of linear response, it is almost constantly increased by 5%.
机译：术语“地震地面运动的空间变异性”表示地震运动振幅和相位内容的差异。这种空间变异性对结构响应的影响仍然是一个悬而未决的问题。现场试验可能有助于回答有关结构尺寸范围内地震动空间变异性的量化以及对其动态响应的影响的问题。本研究的目的是量化希腊阿戈斯托利浅层沉积盆地地震地面运动加速度的可变性，然后确定其对单自由度系统在谱位移方面的线性和非线性弹塑性响应的影响。使用了大约400次地震，由部署在阿戈斯托利的21个元素的非常密集的地震阵列记录，站间间隔从5到160米不等。根据谱加速度评估的地震运动可变性非常显著，并且随着站间距离和频率的增加而增加。然后，将谱位移的振幅变化率（即具有不同基本周期的单自由度（SDOF）系统的线性响应）与具有非线性弹塑性响应的SDOF的振幅变化率进行比较。线性单自由度系统的最大顶部位移的可变性估计为平均12%，在两个狭窄的频率范围内（1.5和1.7 Hz之间以及3和4 Hz之间）观察到较大的可变性。如此高的变化率是由局部边缘产生的衍射表面波引起的。单自由度体系的非线性理想弹塑性结构响应表明，尽管变化趋势与线性响应相同，但几乎不断增加5%。

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