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基于地震动主轴特性的非平稳地震动场的模拟

DOI: 10.13197/j.eeev.2014.05.49.shiyc.007, PP. 49-55

Keywords: 地震动主轴,主轴方向,三维空间,多点地震动输入

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Abstract:

根据前人对地震动主轴的研究,近似定义了某一点的地震动主轴方向第一、二主轴方向为该点至震中的径向和切向,第三主轴方向为竖直方向;通过分析集集地震记录在所定义主轴上的相关情况初步验证了主轴方向近似的合理性。在一维地震动合成公式的基础上,根据地震动主轴功率谱密度函数合成三维空间非平稳的地震动时程,回避了地震动各分量相干性难以确定的难题,并考虑了空间各点地震动自谱强度的变化,以便更好地适用于大尺度结构的多点输入分析。

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