New intensity measure parameter based on recordʹʹs velocity characteristics

Hazard analysis is the prominent stage in performance-based earthquake engineering, and proper intensity measure selection is its signicant phase. Despite diversity in recently proposed intensity measures, there are still signicant variations in the magnitude of structural responses used to assess performance, especially according to the records with pulse-like characteristics. In this study, several intensity measures for two groups of records, far-eld and near-eld, were evaluated in six scaling levels. In addition, a new scalar intensity measure, accounting for pulse-like characteristics of near- eld records, have been generated based on spectral velocity at rst-mode period of a structure and maximum amount of velocity. Utilized structural models are steel moment frames with dierent heights accounting for the eects of wave propagation. It is discovered that this new velocity-based intensity measure is the most convenient IM factor, especially for the stories under pulse propagation associated with near-eld records, considering both eciency and suciency aspects. Furthermore, it is found that utilizing nonlinear spectral values does not signicantly amplify assessment precision in the moderate range of intensity measures, and considering their unavoidably complicating and time consuming required analyses; elastic spectral values can be adequately substituted.