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首页> 外文期刊>Bulletin of earthquake engineering >Coherency model for translational and rotational ground motions
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Coherency model for translational and rotational ground motions

机译：平移和旋转地面运动的一致模型

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Spatial variability of the translational ground motion may influence the seismic design of certain civil engineering structures with spatially extended foundations. Lagged coherency is usually considered to be the best descriptor of the spatial variability. Most coherency models developed to date do not consider the spatial variability of the spectral shape of auto-spectral density (ASD), which is expected to be critical. This paper proposes a coherency model that accounts for the variability in spectral shape of ASD. Numerical results illustrate that the effect is not that critical for a dense array but can be significant in case of large array. Rotational ground motions on the other hand are not measured by the accelerograph deployed in the free-field owing to the unavailability of appropriate instruments and rather extracted from the recorded three-component translational data. Previous studies [e.g., Basu et al. (Eng Struct 99:685-707, 2015)] reported the spatial variability of extracted rotational components, even over a dimension within the span of most civil engineering structures, for example, tens of metres. Since rotation does not propagate like a plane wave, coherency model based on plane wave propagation does not apply to address the spatial variability of rotational components. This paper also proposes an alternative to address the spatial variability of rotational components. Illustrations based on relatively short separation distance confirm the expectation.
机译：平移地面运动的空间可变性可能会影响某些土木工程结构的地震设计与空间扩展的基础。滞后的一致性通常被认为是空间变异性的最佳描述符。迄今为止开发的大多数一致性模型不考虑自动频谱密度（ASD）的光谱形状的空间可变性，这预计将是至关重要的。本文提出了一种相干模型，其占ASD光谱形状的变化。数值结果说明了效果不是对致密阵列至关重要，但在大阵列的情况下可以是显着的。另一方面，由于适当的仪器的不可用，而不是从录制的三组分翻译数据中提取的不可用的加速度，另一方面没有通过自由场部署的加速度测量。以前的研究[例如，Basu等人。 （ENG STRUCT 99：685-707,2015）报道了提取的旋转部件的空间可变性，即使在大多数土木工程结构的跨度内的尺寸，例如，数十米。由于旋转不像平面波，因此基于平面波传播的一致性模型不适用于解决旋转分量的空间变化。本文还提出了一种解决旋转部件的空间可变性的替代方案。基于相对短的分离距离的图示确认了期望。

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