匹配目标谱模拟地震动记录时频特征对比分析  

Comparison of Time-frequency Characteristics of Spectrum-compatible Ground Motion Records

作　　者：王德才[1] 华贝 叶献国[2] 

机构地区：[1]合肥工业大学建筑与艺术学院,安徽合肥230601 [2]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《工程抗震与加固改造》2016年第6期122-128,135,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金项目(51378167)

摘　　要：不同类型匹配目标谱的模拟地震动记录被广泛应用于结构时程分析。以人工合成、小波变换频域调整以及时域调整生成模拟地震动记录方法作为研究对象,采用傅里叶变换和希尔伯特-黄变换方法对比分析了不同类型的模拟地震动记录频域和时频特性;选择不同恢复力模型的弹塑性单自由度结构进行时程分析,对比分析了采用不同类型记录计算的结构位移和能量反应。时域调整记录的地震动特征与实际地震动记录接近,而人工合成记录无法反映实际地震动输入能量特征,不适用于进行结构能量反应评价。Spectrum-compatible ground motion records generated by different methods are widely used in time history analysis of structure. Artificial means,frequency domain adjustment and time domain adjustment used to generate simulated ground motions are investigated in this paper. The time-frequency characteristics of different types of simulated ground motions are analyzed by using Fourier transform and Hilbert-Huang transform. Displacement and energy of inelastic SDOF system are compared when using different types of ground motions in time history analysis. The results show that time domain adjusted motions are closer to real ground motions in the time-frequency characteristics. Synthetic motions can＇ t reflect the characteristics of input energy of real motions,so it＇ s not recommended to select synthetic records to carry out energy assessment.

关 键 词：匹配目标谱 模拟地震动记录 时频特征 时程分析 

分 类 号：TU311.3[建筑科学—结构工程]