Table 2: Proposed replacement and rehabilitation action set.

Action descriptionAction matrixPossible replacement and rehabilitation methods

Do nothingRep, 1Observation
Minor repairRep, 2Corrosion removal, surface cleaning, degreasing, and repainting
Rectify deformed parts
Major repairRep, 3Removal/cut defects and parts and repainting
Rehabilitation repairRep, 4Removal/cut defects and parts, strengthening, and repainting
Structure strengthening by steel plate
Structure strengthening by CFRP
Structure strengthening by external tendons
ReplacementRep, 5Structure replaced by new members