【摘要】 地震引起的地面运动是短暂的和非平稳的,地面运动的强度和频率都具有时变性,结构的分析和设计必须考虑地面运动的非平稳特性。文中回顾和总结了非平稳地震动分析方法,主要包括短时傅立叶变换、瞬时谱、双频谱法、演变谱法、小波变换、非平稳ARMA模型和HHT变换。同时介绍了常用的非平稳地震地面运动模型。在论述各种方法和非平稳地震动模型的同时,对国内外研究发展状况给出了简要的评述,并对非平稳地震动未来分析方法和模型发展趋势做出了预测和展望。更多还原

【Abstract】 The earthquake induced ground motions are transient and non-stationary.Both their amplitude and frequency content vary with time.Analysis and design of structures need to consider these non-stationary char- acteristics.In the paper,an overview is given on analysis method of non-stationary earthquake.It includes Short Time Fourier Transform,Wigner-Ville Distribution,Bispectrum,Evolutionary Spectra,Wavelet Trans- form,Non-stationary ARMA model and Hilbert Huang Transform(HHT).The paper also introduces frequent- ly-used model of non-stationary earthquake ground motion.In addition,a comparison is made between the do- mestic and international studies on the aforementioned topics.Finally,recommendations are given for future development of the analysis method and model of non-stationary earthquake ground motion.更多还原