The Impact of Non-Spectral Intensity Measures on the Structural Responses

摘要

Although it is well acknowledged that the severity of earthquake ground motions (GMs) can be categorized considering different features of GMs, non-spectral aspects of GMs are not explicitly considered in seismic design requirements. This study examines the impact of neglecting non-spectral parameters of GMs on the intensity- and risk-based structural responses. The structural responses of three steel moment resisting buildings in terms of maximum inter-story drift ratio and maximum floor acceleration are compared when subjected to different ensembles of GMs, which are selected based on the generalized conditional intensity measure. It is found that neglecting non-spectral features of GMs could induce a bias up to 50% in the structural responses depending on the considered building and damage metric. In addition, it was observed that ignoring non-spectral features of GMs in the GM selection process can lead to an overestimation in the estimated probability of collapse. In overall, the findings confirm that nonspectral GM features are important parameters to be incorporated in GM selection process for both intensity- and risk-based seismic assessment. non-spectral ground motion features; risk-based assessment; intensity-based assessment; conditioning intensity measure; generalized conditional intensity measure (GCIM); ground motion selection;