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地震总输入能量谱峰值估计

DOI: 10.3969/j.issn.1006-7043.201305045

Keywords: 抗震设计, 地震总输入能, 能量谱峰值, 等效速度谱, 傅里叶谱, 地震波, 峰值

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Abstract:

为了改善地震总输入能谱建立过程中峰值计算精度和计算效率,根据美国西部强震数据库中I类场地(剪切波速大于750 m/s)的69条地震记录的能量谱峰值,研究了等效速度谱(VI谱)峰值的主要影响因素以及相关性。采用傅里叶变换和线性拟合方法,研究了VI谱峰值和地震波频率成分之间的关系。进而提出了基于傅里叶谱的VI谱峰值参数α,建立了简化的谱峰值计算公式。研究结果表明:具有相近场地条件、地震动峰值和持时的地震波可能导致较大的VI谱峰值差异;地震动傅里叶幅值谱的低频集中度、幅值谱峰值与单自由度体系的VI谱峰值有较大的关联度,其中0~10 Hz频率段的关联度最大。

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