【摘要】 基于随机理论中功率谱、傅立叶幅值谱及相位谱之间的关系,建立了与现行建筑抗震设计规范反应谱相对应、考虑地震动空间作用的地震波合成技术,并重点阐述了快速傅立叶变换技术(FFT)在地震波合成中的应用。针对目前对人工合成地震波检验主要集中在频域中的相干性检验,提出了对人工合成地震波在时域进行相关性检验的必要性。利用MATLAB编制了与规范反应谱相对应的地震波合成及检验程序,并对该程序的各项功能进行了数值验证。更多还原

【Abstract】 Based on design response spectrum of seismic design code,a simulation method for multi-support ground motion time history is developed.The relation between amplitudes spectrum,phase angles spectrum and power spectrum is established with random process theory.FFT techniques are used to improve synthetics efficiency of simulation.Because the methods of checking simulation seismic waves are focused on coherence mainly nowadays,a method of checking correlation is presented,and the importance of checking correlation is verified.Corresponding simulation and checking programs are designed in MATLAB,and an examples is used to verify the accuracy of the programs.更多还原