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2. 2) Railway Technical Research Institute, "Standard of Structure Maintenance, Steel Structures," December 1997.
3. 3) Railway Technical Research Institute, "Guideline for Repair, Reinforcement, Modification of Steel Structures," June 1996.
4. 5) Vo, T. H., "A Study on Evaluation of Load-carrying Capacities of Corroded Steel Bridges," dissertation, Tokyo Institute of Technology, 2004.11.