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Structural Monitoring and Maintenance
  Volume 2, Number 2, June 2015, pages 133-143
open access

Risk-based optimum repair planning of corroded reinforced concrete structures
Jaya Nepal and Hua-Peng Chen

    Civil engineering infrastructure is aging and requires cost-effective maintenance strategies to enable infrastructure systems operate reliably and sustainably. This paper presents an approach for determining risk-cost balanced repair strategy of corrosion damaged reinforced concrete structures with consideration of uncertainty in structural resistance deterioration. On the basis of analytical models of cover concrete cracking evolution and bond strength degradation due to reinforcement corrosion, the effect of reinforcement corrosion on residual load carrying capacity of corroded reinforced concrete structures is investigated. A stochastic deterioration model based on gamma process is adopted to evaluate the probability of failure of structural bearing capacity over the lifetime. Optimal repair planning and maintenance strategies during the service life are determined by balancing the cost for maintenance and the risk of structural failure. The method proposed in this study is then demonstrated by numerical investigations for a concrete structure subjected to reinforcement corrosion. The obtained results show that the proposed method can provide a risk cost optimised repair schedule during the service life of corroded concrete structures.
Key Words
    reinforcement corrosion; residual strength; stochastic deterioration modelling; time-dependent reliability; optimised maintenance strategy
Jaya Nepal and Hua-Peng Chen: School of Engineering, University of Greenwich, Chatham Maritime, Kent, ME4 4TB, UK

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