Abstract
The extent of damage to structures after an earthquake can be quantified by using damage indices in performance-based seismic design. Several damage indicators are discussed and evaluated for their applicability in seismic damage evaluation. The correlation between a new performance index proposed previously by some of the authors and energy-based damage indicators is studied numerically. To this aim, a six-storey reinforced-concrete frame structure is designed according to current seismic codes. Pushover analyses with three load patterns, as well as dynamic time histories for typical ground motions scaled for varying intensities, are performed on the structure. The grade of interdependency between the proposed performance index and the energy-based damage indices is quantified using a correlation coefficient. The results show that the proposed performance index exhibits high correlation with the energy-based damage indicators; some are almost perfectly correlated. What is more, this index is proved to be not sensitive to the lateral load patterns of pushover analysis. Therefore, it is recommended that the proposed performance index can be used as a substitute for energy-based damage measures to assess the seismic performance of structures.
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