Optimum maintenance scenario generation for existing steel-girder bridges based on lifetime performance and cost

Kyung Hoon Park, Sang Yoon Lee, Jung Hyun Yoon, Hyo Nam Cho, Jung Sik Kong

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


This paper proposes a practical and realistic method to establish an optimal lifetime maintenance strategy for deteriorating bridges by considering the life-cycle performance as well as the life-cycle cost. The proposed method offers a set of optimal tradeoff maintenance scenarios among other conflicting objectives, such as minimizing cost and maximizing performance. A genetic algorithm is used to generate a set of maintenance scenarios that is a multi-objective combinatorial optimization problem related to the lifetime performance and the life-cycle cost as separate objective functions. A computer program, which generates optimal maintenance scenarios, was developed based on the proposed method using the life-cycle costs and the performance of bridges. The subordinate relation between bridge members has been considered to decide optimal maintenance sequence and a corresponding algorithm has been implemented into the program. The developed program has been used to present a procedure for finding an optimal maintenance scenario for steel-girder bridges on the Korean National Road. Through this bridge maintenance scenario analysis, it is expected that the developed method and program can be effectively used to allow bridge managers an optimal maintenance strategy satisfying various constraints and requirements.

Original languageEnglish
Pages (from-to)641-653
Number of pages13
JournalSmart Structures and Systems
Issue number5
Publication statusPublished - 2008 Sept


  • Bridge maintenance
  • Life-cycle cost
  • Life-cycle performance
  • Optimum maintenance scenario
  • Steel-girder bridges

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computer Science Applications
  • Electrical and Electronic Engineering


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