Reliability Based Investment Prioritization in Transportation Networks

Transport networks are vulnerable to disasters which disrupts their normal function. Collapse of I-35W Bridge in Minneapolis and closure of I-65 in Kentucky due to a freight train derailment in 2007 are two recent examples which underline a need to invest on reliability of network elements. This paper discusses a network perspective for optimizing resource allocation based on reliability of transport infrastructure. For this purpose, an optimization framework is developed to efficiently assign the resources to maximize the network reliability. Two measures are identified for each link. Each link may have several states of degradation. The effect of degradation in a link on the network is also considered. As the decision variables are integer, this optimization problem is tackled by implementing an Integer Programming (IP) technique. The proposed framework is applied to an example network and numerical results are presented. The proposed methodology could successfully allocate resources for network reliability improvement.

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