基于能量分布的地震动聚类与反应谱特征周期的确定

收集了7 778条水平地震动加速度记录,分析了其频谱特性.提出了一类基于能量分布的地震动聚类方法.按照该方法将同一类场地条件下的地震动记录分为3组.按照我国建筑抗震设计规范关于设计地震动的分类方式,确立了不同分组特征周期的建议值,分析了建议值与我国抗震设计规范规定的不同设计地震动分组特征周期的差异.研究表明,与文中建议值相比,现行规范规定的设计地震动特征周期第1组、第2组取值偏大,第3组取值偏小.

Ground Motion Clustering Method Based on Energy Distribution and Determination of Characteristic Periods

Seven thousand seven hundred and seventy eight ground motion records were collected. For each group of seismic ground motion, the spectral characteristics were analyzed. A type of ground motion clustering method based on energy distribution was introduced. According to this method, the records belonging to the same site type can be divided into three parts. For each group of seismic ground motion, the characteristic periods were proposed based on the Chinese seismic resistance code. Besides, the differences between the proposed value and the code value were analyzed. The research shows that, compared with the proposed values, the code characteristic periods of group 1 and group 2 are bigger, while the values of group 3 are smaller.