Abstract
Intensity Measures (IMs) play a crucial role in assessing the performance of structures. The central question is how to find an IM that represents the destructive power of an earthquake. The problem becomes more complex considering the Soil-Structure Interaction (SSI) and the 3D state. This study tries to find the best IM for 3D steel structures by analyzing two eight-story buildings with different structural systems under eighty-one seismic records. Twenty-two IMs, five engineering demand parameters, and four combination methods are used. One of the structures is reanalyzed after removing the SSI to understand the difference. The five IM assessment criteria used in the research are efficiency, sufficiency, practicality, proficiency, and hazard computability. Updated frameworks are used for the assessment criteria to make the results comparable. The results shed light on the suitable IM, the best combination method, the effect of the structural system, and the role of SSI.
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