Evaluation of Transportation Network Reliability under Emergency Based on Reserve Capacity

Xiongfei Zhang,Qin Luo,Qi Zhong

doi:10.1155/2019/1370159

Xiongfei Zhang, Qin Luo + Show 1 more

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https://doi.org/10.1155/2019/1370159

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Abstract

There are differences between the requirements for traffic network for traffic demand in daily and emergency situations. In order to evaluate how the network designed for daily needs can meet the surging demand for emergency evacuation, the concept of emergency reliability and corresponding evaluation method is proposed. This paper constructs a bilevel programming model to describe the proposed problem. The upper level problem takes the maximum reserve capacity multiplier as the optimization objective and considers the influence of reversible lane measures taken under emergency conditions. The lower level model adopts the combined traffic distribution/assignment model with capacity limits, to describe evacuees’ path and shelter choice behavior under emergency conditions and take into account the traits of crowded traffic. An iterative optimization method is proposed to solve the upper level model, and the lower level model is transformed into a UE assignment problem with capacity limits over a network of multiple origins and single destination, by adding a dummy node and several dummy links in the network. Then a dynamic penalty function algorithm is used to solve the problem. In the end, numerical studies and results are provided to demonstrate the rationality of the proposed model and feasibility of the proposed solution algorithms.

Highlights

In recent decades, the frequent occurrence of emergencies around the world has caused certain casualties and property losses, posing a great challenge to public security
To investigate the maximum emergency evacuation demand that can be satisfied by the network designed for daily needs, this paper analyzes the traffic demand under emergency conditions and takes the emergency reliability of traffic network as the research target
This paper evaluates traffic network reliability under emergency conditions from planning perspective

Summary

Introduction

The frequent occurrence of emergencies around the world has caused certain casualties and property losses, posing a great challenge to public security. When these emergencies occur in densely populated urban areas, they are undoubtedly becoming a burden to the already crowded urban traffic. To investigate the maximum emergency evacuation demand that can be satisfied by the network designed for daily needs, this paper analyzes the traffic demand under emergency conditions and takes the emergency reliability of traffic network as the research target. When studying the traffic network emergency reliability, we should consider the particularity of emergency traffic demand, and consider the impact of these measures on the network service capacity at the same time.

Literature Review

Problem Statements

Mathematical Formulation

Solution Algorithm

Numerical Experiments

Conclusions