Method for Developing Motion Damage Relationships for Reinforced Concrete Frames

This report presents formulations for developing fragility curves and damage probability matrices for reinforced concrete (RC) frame structures. Three different classes of RC frames, based on the story heights, are considered. The comparison of the damage probability matrices (DPM) for the three classes of RC frames, developed in this study, with those in ATC-13 (1985) shows that the ATC-13 DPM's potentially underestimate the damage, particularly at high intensity levels. Because existing definitions of damage to RC structures are found to be inadequate, a new technique for identifying different damage states is presented that considers crack widths and interstory drift ratios.