Comparative Evaluation of Different Damage Measures for R/C Buildings Considering Variable Incident Angles

Abstract eng:
One way of quantifying the extent of seismic damage induced to Reinforced Concrete (R/C) structures is the use of damage indices. Various damage indices have been introduced by many researchers incorporating different parameters for estimating structural damage. The aim of the present paper is the comparative evaluation of three of the most widely used damage indices for the R/C buildings taking into account the orientation of the strong motion. For the investigation of the present study three symmetric in plan R/C buildings are investigated: a low-rise building (3 stories), a medium-rise building (5 stories) and a high-rise building (8 stories). The three buildings are analysed by nonlinear timehistory analysis using 20 bi-directional earthquake ground motions. The two horizontal accelerograms of each ground motion are applied along horizontal orthogonal axes forming 72 different angles with the structural axes. For each ground motion and incident angle, the local damage indices at every relevant cross section as well as the overall damage index of the building are computed using three different definitions of the damage index. The analyses results show that the numerical estimation of the seismic damage induced to R/C buildings depends on the damage index used to quantify the damage. Moreover, the overall damage state of the building is significantly affected by the incident angle of the ground motion.

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