This study presents the fragility functions for reinforced concrete columns incorporating recycled aggregates, which are obtained from waste concrete, for performance-based seismic assessment after an earthquake. The columns evaluated in generating fragility functions are either (i) flexure-critic columns with composite reinforcement, or (ii) shear-critic columns with composite reinforcement. Based on the comparison of these fragility functions, the effect of failure mode on the fragility functions of the columns incorporating recycled aggregates is obtained. On the other hand, according to the comparison of the fragility functions obtained for the column type specified in the statement (i), and the fragility functions, available in the literature, obtained for flexure-critic reinforced concrete columns/frames incorporating reycled aggregates with conventional reinforcement, the effect of reinforcement type on the fragility functions is revealed. The test data used in the development of the fragility functions are the types of damage occurring after an earthquake-type loading of columns and frames incorporating recycled aggregates in the literature. The drift ratio is considered as the demand parameter. As a result, larger deformations are observed for the columns subjected to lower axial loads in the database, while the drift ratios associated with "severe damage" develop earlier for the columns exposed to higher axial loads regardless of the failure mode and type of reinforcement. It is also found that that the fragility functions of the columns incorporating recycled aggregates, which have similar failure mode but have different reinforcement type, differ, particularly, for the damage state representing severe damage. This difference may be due to the higher stiffness of the columns with composite reinforcement than the columns with conventional reinforcement.

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