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Approximate Transportation Network Reliability Measures for Solving Transportation Network Improvement Problem

Iranitalab, Amirfarrokh | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44698 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Poorzahedy, Hossain
  7. Abstract:
  8. Long-term effects of natural disasters, like earthquakes, in many cases have been reported high on transportation networks. Disruption in this lifeline network's performance imposes high social and economic costs upon the society. Undoubtedly, retrofitting the structures of all network links (or constructing new links) are practically impossible and economically infeasible. One solution to this problem is finding a method for determining the network's important links, and retrofitting their structures. Based on this concept, an optimization problem of network performance improvement under these stochastic events is introduced. In this problem, a link importance index for network links is defined based on network reliability, and various improvement methods are proposed for links' structures.
    Network reliability computation is practically difficult. In this study, three approximate methods are proposed for calculating network reliability based on random sampling of possible network states after the occurrence of the stochastic event. The first one uses upper and lower bounds to approximate this quantity, the second is a method based on Bayesian decision-making procedure, and the third is a heuristic method. Also in this study, a direct (reliability free) method for calculating a link importance index is proposed. The methods are tested and assessed by designing example networks and implementing these methods. Evaluation is based on the results of reliability computations and solution of the network improvement problem. The results show that the Bayesian and the heuristic methods are suitable for network reliability computation. Moreover, based on network improvement problem solution, the heuristic method works well for all different levels of budget, while the direct method is more appropriate for higher levels of budget
  9. Keywords:
  10. Earthquake ; Reliability ; Approximation ; Bayesian Decision Making Theory ; Random Sampling ; Network Improvement ; Transportation Network

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