Correlation between structure-specific ground motion intensity measures and seismic response of 3D R/C buildings

The present paper investigates the correlation between a number of structure-specific ground motion intensity measures and the damage state of 3D R/C buildings. To accomplish this purposefour 5-story R/C buildings are studied. The buildings are analyzed by nonlinear time history analysis using 20 bidirectional earthquake ground motions. The two horizontal accelerograms of each ground motion are applied along the structural axes of the buildings. The structural damage is expressed in terms of the maximum interstory drift as well as the overall structural damage index. For each individual pair of accelerograms the values of the aforementioned seismic damage measures are determined. Then, they are correlated with severalstrong motion intensity measures that take into account both earthquake and structural characteristics. The research identified certain intensity measures which exhibited strong correlation with the seismic damage of the four buildings. However, the degree of correlation between them and the seismic damage depends on the response parameter adopted. Furthermore, it was confirmed that the widely used spectral acceleration at the fundamental period of the structure is a good indicator of the expected earthquake damage level.

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