Abstract: Damage assessment of bearing members before rehabilitation is necessary. If the damage state of a member is expressed by a number called "damage index". One of the most popular damage indexes for reinforced concrete (RC) members is Park-Ang Damage Index model. This model has been established based on the experimental results of RC beams and columns with different modes of damage. It has considerable uncertainty based on its authors’ remarks. In this study, the precision of Park-Ang model for RC columns was improved by using some experimental results from the Peer's (Pacific Earthquake Engineering Research) data bank. The proposed model focuses on RC columns with specific sections and collapse modes.

Keywords: Damage index, reinforced concrete columns, Park-Ang model, Strengthening

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