A Risk-Cost Optimized Maintenance Strategy for Corrosion-Affected Concrete Structures

Corrosion of reinforcing steel in concrete is the main cause of premature failures of reinforced concrete structures located in chloride-laden environments. It is also observed that some severely deteriorated concrete structures survive for many years without maintenance. This raises the question of why and how to maintain corrosion-affected concrete structures, in particular in a time where there is an increasing paucity of resources. This paper aims to formulate a maintenance strategy based on risk-cost optimization of a structure during its entire service life. A time-dependent reliability method is used to determine the probability of exceeding a limit state at each phase of the service life. To facilitate practical application of the formulated maintenance strategy, an algorithm is developed and programmed in a user-friendly manner with a working example. A merit of the proposed maintenance strategy is that models used in risk assessment for corrosion-affected concrete structures are related to some of the design criteria used by practitioners. It is found in this research that there exists an optimal level of maintenance for cracking and delamination that returns the minimum total cost for the structure over its entire life. The maintenance strategy presented herein can help structural engineers, operators, and asset managers develop a cost-effective management scheme for corrosion-affected concrete structures.

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  • Authors:
    • Li, Chun-Qing
    • Mackie, Robert Ian
    • Lawanwisut, W
  • Publication Date: 2007-7

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01051331
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 13 2007 6:56PM