Files in this item



application/pdfZhuoran_Wu.pdf (2MB)
(no description provided)PDF


Title:Non-branching hybrid transit network design under heterogeneous demand
Author(s):Wu, Zhuoran
Advisor(s):Ouyang, Yanfeng
Department / Program:Civil & Environmental Eng
Discipline:Civil Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):transit network design
non-branching hybrid structure
optimization model
heterogeneous trip demand
Abstract:Daganzo (2010) proposed a hybrid structure combining grid scheme in the center and hub-spoke scheme in the periphery to design a competitive transit network on a square region. A nonlinear continuous optimization model is built upon this structure to minimize total transit system cost. One of this model’s main limitations is the uniform trip demand assumption, which constrains its applicability in real-world. Another pitfall is that lines branch in peripheral region, resulting in expanded facilities and longer waiting time for transit services. To bridge these gaps, a hybrid transit network layout with non-branching routes is proposed. To capture spatial heterogeneity of trip demand, method of deriving zone-to-zone trip demands from continuous demand density function is borrowed from Smith (2014). To obtain optimal network layout and vehicle dispatching frequencies, a mathematical model that minimizes transit system cost based on various zone-to-zone demands is formulated. By allowing different stop spacing in the central and peripheral regions, more flexibility is given to the structure in obtaining the solutions. A series of scenarios under heterogeneous demand distribution in various transit mode choices and demand levels are designed to test impacts of these critical factors on optimal solutions. Results show that BRT is the most competitive mode while metro’s performance increases largely when demand is higher. In addition, as trip rate increases, system cost per passenger will be reduced. Compared with the branching hybrid model (Smith, 2014), the proposed model in this thesis shows better performance in cost saving. Several interesting future research topics are inspired by the outcomes of this thesis, including extensions to network structures, model extensions as well as multimodal hierarchical transit network design.
Issue Date:2014-09-16
Rights Information:copyright 2014 Zhuoran Wu
Date Available in IDEALS:2014-09-16
Date Deposited:2014-08

This item appears in the following Collection(s)

Item Statistics