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A Solution for Network Design Problem by B.O.T (Build-Operate-Transfer) and Considering Uncertain Parameters of the Problem

Qiam, Shirin | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51892 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Poorzahedy, Hossain
  7. Abstract:
  8. Governments are concurrently faced with two problems in Network Development Problem (NDP): limited resources to invest, and the economic justification of the candidate projects. Public- Private Participation (PPP) is a solution for the first problem, in which Build- Operate- Transfer (BOT) is a scheme to implement this partnership.This study formulates a NDP, in which two sources of funds back projects’ construction: that of the private investor and the public budget for this purpose. The problem is seen as bi-level optimization, with the upper level dealing with the government decisions on the level of participation (from 0 to 100 percent of the project costs), and the lower level being a special traffic flow problem. The latter problem is a multi-modal flow with elastic demand that may use project links in the network upon paying the respective tolls. These tolls, for each project link, are designed such that the present worth of the collected fares add up to cover the investment cost of the private investor with the agreed upon rate of interest during the concession period. The upper level decision variables are binary 1/0 (build/ no build) for the project construction as well as the share of project cost for each (public/ private) party. This problem is subject to the government budget. The lower level decision variables are the continuous flows as well as the price of using each project by each mode. The constraints are those of the flows, as well as the expressions that guarantee the return of the investment costs, with interest, for each project, by the tolls collected from the users of the respective links.The upper problem is solved by a specially designed Ant System which decides the government share of each project investment cost. The lower level problem is solved by an adaptation of the Jin’s evolutionary traffic equilibrium flow algorithm.The model is applied on a test network and the results analyzed. These results show that there is a need for uncertainty analysis in the problem. This analysis is undertaken by classifying the demand into three types (of insensitive, average and sensitive to the change of O/D travel costs), and assuming a normal distribution for the potential demand for travel for each mode. The results are discussed, and potential future research directions are suggested
  9. Keywords:
  10. Network Design ; Build-Operate-Transfer (BOT) ; Road Pricing ; Multi Modal Traffic Assignment ; Bi-level Model ; Demand Uncertainty

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