Abstract:
The characteristics of earthquake intensity measures (
IMs) were preferentially extracted by factor analysis through considering multiple
IMs, and the principal factor of multivariate
IMs in terms of a linear combination of the extracted fundamental factors was then constructed. The nonlinear responses of single degree of freedom (SDOF) systems modelled with different hysteretic models and multiple degree of freedom (MDOF) systems subjected to 2766 ground motions records were used. Nine
IMs were selected and their characteristics were extracted by factor analysis and the correlation between the principal factor of multivariate
IMs and damage measures (
DMs) was investigated. The results show that the
IM components belong to a stable principal factor irrespective of site category and the two principal factors extracted by factor analysis have positive interpretability. The site category, hysteretic behavior and lateral strength ratio have little influence on the correlation coefficient between the principal factor of multivariate
IMs and
DMs. The principal factor of multivariate
IMs shows significantly high-level correlation with
DMs through considering multiple
IMs.