Probabilistic Assessment of Global Damage Index for Steel Moment-Resisting Frames Based on Local Responses

A new scenario-based method is proposed to determine the performance range of structural systems. The advantage of this method is using inter-storey drift as a damage index, while exploiting local damage indices of the main structural members without the need for detailed analytical models and computationally expensive non-linear dynamic analyses. A new damage function is proposed by linking the local (plastic hinge rotations) and global (inter-storey drifts) damage levels. The accuracy of the proposed function is evaluated and compared with the indices in ASCE41-06, ATC-13, and HAZUS for a set of steel moment-resisting frames subjected to earthquakes of varying intensities.