地震动多元强度参数主成分与结构损伤的相关性分析

ANALYSIS OF CORRELATION BETWEEN PRINCIPAL COMPONENTS OF MULTIVARIATE EARTHQUAKE INTENSITY MEASURES AND STRUCTURAL DAMAGE

采用主成分分析方法,考虑多个地震动强度参数,综合分析多元地震动强度参数主成分与结构损伤之间的相关性。以单自由度体系为研究对象,使用三种恢复力模型,选择80条真实地震动记录作为输入,分析得到体系在地震作用下的最大位移和滞回能量。采用挑选的10个地震动强度参数,基于主成分分析方法,构造地震动强度的主成分线性组合,并对地震动强度参数主成分与结构损伤之间的相关性进行分析。结果表明:由于考虑了多个地震动强度参数,相比于单个地震动强度参数与结构损伤之间的相关性,地震动多元强度参数主成分与结构损伤之间的相关性更为稳定。

The correlation between multivariate earthquake intensity measures and structural damage was comprehensively studied by incorporating multiple earthquake intensity measures and adopting the principal component analysis method.The single degree of freedom systems were used as the study objects,which were defined by three kinds of constitutive models.A set of 80 real ground motion records were selected as the inputs,and the structural responses in terms of maximum displacement and hysteretic energy were calculated.Ten earthquake intensity measures were selected,and the principal component analysis method was adopted to construct the principal linear combination of the earthquake intensity measures.Then the correlation between the principal components of multivariate earthquake intensity measures and the structural damage was studied.The results show that,compared with the correlation between a single earthquake intensity measure and structural damage,the correlation between the principal components of earthquake intensity measures and the structural damage is more stable since it considers multiple earthquake intensity measures.