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首页> 外文期刊>Bulletin of earthquake engineering >Spatial variation and conditional simulation of seismic ground motion
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Spatial variation and conditional simulation of seismic ground motion

机译：地震地面运动的空间变化与条件模拟

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Spatially varying ground motion (SVGM) may have influence on certain civil engineering structures with spatially extended superstructure and/or substructures. Conditional simulation of spatially varying ground motion (CSSVGM) may be viewed from two different perspectives. Most procedures available in the literature neglect the spatial variability in auto-spectral density (ASD) and estimate the SVGM through cross-spectral density (CSD) which was computed using the empirical coherency models. This paper proposes a coherency model that accounts for the spatial variability of ASD. A framework has been developed for the CSSVGM, through the mapping of both proposed coherency model and ASD over the footprint of an array. Current framework (existing in the literature) accounts for only the phase variability of SVGM while proposed framework accounts for both phase and amplitude variability. Ground motion generated from both perspectives is then assessed with the data recorded over SMART1 and LSST arrays. For the purpose of assessment, a definition of target spectrum based on the direction of arrival is explored. The effect of choice of coherency model on the simulated spatially varying ground motion is investigated first. Spectra resulting from both the perspectives are assessed against the target spectrum. An attempt has been made to predict the SVGM for a future event using a coherency model calibrated against a past event and an estimate of ASD of the seed ground motion. Finally, the effect of form of ASD (of a seed ground motion) on SVGM simulated is investigated by considering the ASD in different forms. Simulating SVGM through the mapping of both coherency model and ASD seems to be more appropriate than through CSD.
机译：空间变化的地面运动（SVGM）可能对某些土木工程结构有影响，具有空间延伸的上层建和/或子结构。可以从两种不同的观点来观看空间变化的地面运动（CSSVGM）的条件模拟。文献中可用的大多数程序都忽略了自动光谱密度（ASD）的空间可变性，并通过使用经验一致模型计算的跨光谱密度（CSD）来估计SVGM。本文提出了一个相干模型，其占ASD的空间变异性。通过在阵列的占地面积上，通过映射到CSSVGM为CSSVGM开发了一个框架。目前框架（文献中存在）仅占SVGM的相变性，而提出的框架占相位和幅度可变性。然后，通过记录在Smart1和LSST阵列上记录的数据来评估从两个透视图产生的地面运动。为评估目的，探讨了基于抵达方向的目标谱的定义。首先研究了一致模型在模拟的空间变化地运动上的选择的影响。从目标频谱评估由视角产生的光谱。已经尝试预测使用与过去事件的一致性模型进行校准的一致性模型的未来事件的SVGM，以及种子地面运动的ASD的估计。最后，通过考虑不同形式的ASD来研究模拟SVGM模拟SYD（种子地面运动）的效果。通过两次相干模型的映射模拟SVGM，ASD似乎更适合通过CSD。

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