Correlation of Different Strong Motion Duration Parameters and Damage Indicators of Reinforced Concrete Structures

Abstract eng:
Strong motion duration of an earthquake is an important and widely used seismic parameter. However, several definitions for strong motion durations exist that provide significantly different values for a given seismic excitation. This study examines the interdependency between several strong motion duration definitions and the overall building damage. In addition, peak ground acceleration and Arias intensity are considered as well. The overall damage indices after Park/Ang and after DiPasquale/Çakmak are used to express the post-seismic damage status, while the interdependency between the seismic parameters and the damage indicators have been evaluated by a correlation study. The investigation has been applied on a six story reinforced concrete building using as seismic excitation, a set of 450 different synthetic accelerograms. The results have shown that the peak ground acceleration and the Arias intensity provide medium and high correlation with the examined damage indices, respectively, while on the other hand, the correlation grade between the damage indices and the strong motion duration varies according to the definition used. Thus, the "absolute" definition group of bracketed durations provided better correlation with the damage indices than those of the "relative" one.

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