【摘要】 Hilbert-Huang Transform(HHT)是一种新的适用于非线性、非平稳信号,且具有自适应性的数据处理方法.本文简要介绍了一座45层钢筋混凝土框架结构及其振动台试验模型概况.利用HHT分析了模型结构在不同烈度地震中的反应记录,得到了Hilbert时频幅值三维分布和Hilbert边际谱.Hilbert谱得到记录能量集中分布的频段与时间范围,捕捉到信号变化的主要特征.Hilbert边际谱曲线形状和峰值频率值随着地震烈度的升级而发生了相应变化,而且所有的结果图形体现出相同的规律性,预示着Hilbert边际谱在土木工程结构安全评价中的应用前景.更多还原

【Abstract】 Hilbert-Huang transform(HHT)is a novel data analysis method which can be used to process nonlinear,non-stationary data and is very adaptive.A 45-storey RC frame structure and its shake table test model were briefly introduced.The structural response records under different seismic intensities were analyzed with HHT method,and the time-frequency-amplitude and Hilbert marginal spectrum were obtained.The result shows that Hilbert spectrum can clearly present the energy distribution with time and frequency.Most energy of Hilbert spectrum is much more concentrated in the definite range of time and frequency.The Hilbert spectrum can grasp main characteristics of the signal.Hilbert marginal spectrum curve and natural vibration frequency at peak amplitude vary with different seismic intensity.The same trend of all figures shows that Hilbert marginal spectrum can be used in the safety assessment of civil engineering structures.更多还原