王德才, 华贝, 种迅, 蒋庆, 叶献国. 基于输入能量的地震动时程强度包络函数研究[J]. 工程力学, 2019, 36(9): 161-168. DOI: 10.6052/j.issn.1000-4750.2018.08.0452
引用本文: 王德才, 华贝, 种迅, 蒋庆, 叶献国. 基于输入能量的地震动时程强度包络函数研究[J]. 工程力学, 2019, 36(9): 161-168. DOI: 10.6052/j.issn.1000-4750.2018.08.0452
WANG De-cai, HUA Bei, CHONG Xun, JIANG Qing, YE Xian-guo. STUDY ON THE TIME HISTORY ENVELOPE FUNCTION OF GROUND MOTION BASED ON INPUT ENERGY[J]. Engineering Mechanics, 2019, 36(9): 161-168. DOI: 10.6052/j.issn.1000-4750.2018.08.0452
Citation: WANG De-cai, HUA Bei, CHONG Xun, JIANG Qing, YE Xian-guo. STUDY ON THE TIME HISTORY ENVELOPE FUNCTION OF GROUND MOTION BASED ON INPUT ENERGY[J]. Engineering Mechanics, 2019, 36(9): 161-168. DOI: 10.6052/j.issn.1000-4750.2018.08.0452

基于输入能量的地震动时程强度包络函数研究

STUDY ON THE TIME HISTORY ENVELOPE FUNCTION OF GROUND MOTION BASED ON INPUT ENERGY

  • 摘要: 结构随机振动分析和人工合成地震动记录均需要将反应谱转换为功率谱,地震动强度包络函数对转换结果有着重要影响。为合理地确定强度包络函数模型中各参数的取值,依据输入能量谱与傅里叶幅值谱的精确转换关系,建立了由非平稳地震动功率谱计算输入能量谱的方法,并分析了各参数取值对功率谱与能量谱的影响。以匹配设计谱的天然地震动记录样本的平均输入能量谱作为参考依据,通过与设计谱转换得到的输入能量谱进行对比分析,确定了各类场地设计谱转换为功率谱时,强度包络函数模型的各参数取值。通过人工合成地震动记录的输入能量谱分析,验证了各参数取值的合理性。

     

    Abstract: The conversion between power spectral density functions and response spectra is widely used in random vibration analysis and procedure of generating artificial ground motions, where the envelope function of ground motion has significant influence on the conversion results. In order to determine the parameters of the envelope function model reasonably, the conversion between nonstationary power spectra and input energy spectra is established based on the method of exact computation of input energy spectra from Fourier amplitude spectra. The influence of different parameters on power spectrum and input energy spectrum is analyzed. The average input energy spectrum of the natural ground motions matching the design spectrum is used for comparison. The values of different parameters of the envelope function model are obtained for the conversion between power spectra and design spectra of different site condition through comparing with the input energy spectra converted by design spectra. The rationality of the values of parameters is validated by the characteristics of input energy spectra of artificial records.

     

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