Abstract
Life in the modern world depends on multiple critical services provided by infrastructure systems which are interdependent at multiple levels. To effectively respond to infrastructure failures, this paper proposes a model for developing optimal joint restoration strategy for interdependent infrastructure systems following a disruptive event. First, models for (i) describing structure of interdependent infrastructure system and (ii) their interaction process, are presented. Both models are considering the failure types, infrastructure operating rules and interdependencies among systems. Second, an optimization model for determining an optimal joint restoration strategy at infrastructure component level by minimizing the economic loss from the infrastructure failures, is proposed. The utility of the model is illustrated using a case study of electric-water systems. Results show that a small number of failed infrastructure components can trigger high level failures in interdependent systems; the optimal joint restoration strategy varies with failure occurrence time. The proposed models can help decision makers to understand the mechanisms of infrastructure interactions and search for optimal joint restoration strategy, which can significantly enhance safety of infrastructure systems.
Highlights
The functioning of a society is dependent on large-scale infrastructure systems to deliver services to consumers in an efficient manner
Zhang et al [11] presented an approach for allocating restoration resources to enhance resilience of interdependent infrastructure systems, in which the recovery process of interdependent infrastructure systems is described as the dynamic inoperability input-output model
To develop joint restoration strategy at component level, i.e. determining the joint restoration sequence of physically failed nodes at each time step, following assumptions are made: (i) the earliest beginning of restoration is the time step following infrastructure failures occur. (ii) A physically failed nodes could recover to normal functioning within one time step when they are restored. (iii) For each infrastructure network, the time steps used for restoration should be no more than the number of physically failed nodes in the network
Summary
To effectively respond to infrastructure failures, this paper proposes a model for developing optimal joint restoration strategy for interdependent infrastructure systems following a disruptive event. Models for (i) describing structure of interdependent infrastructure system and (ii) their interaction process, are presented. Both models are considering the failure types, infrastructure operating rules and interdependencies among systems. Results show that a small number of failed infrastructure components can trigger high level failures in interdependent systems; the optimal joint restoration strategy varies with failure occurrence time. The proposed models can help decision makers to understand the mechanisms of infrastructure interactions and search for optimal joint restoration strategy, which can significantly enhance safety of infrastructure systems
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