Damage Classification of Precast Concrete Column Post-Tensioned by Unbonded Tendons Based on Limit States

Key Points

• This research aims to propose a simplified method for assessing damage in precast concrete columns post-tensioned with unbonded tendons, based on limit states.
• Proposed a damage assessment method focusing on concrete and residual crack width.
• Evaluated the final damage classification using maximum bending moment at the column head and base.
• Converted limit states of unbonded PC components into bending moments using compression concrete strain.
• Identified that only concrete and residual crack width were necessary for determining damage level.
• Confirmed that residual deformation angle is not needed for damage assessment.
• Demonstrated a method to assess concrete damage from maximum bending moments.