Bridges, Tunnels and other Transportation Structures
Full Session with Abstracts
Bridge network is an essential part of the transportation system but when subject to aging bridges, their repair and replacement activities must result in severe traffic delays and disruptions that heavily impact the daily traffic communities. Therefore, a rapid replacement construction technique is necessary to help bridges maintain in a timely fashion and minimize the network-level traffic losses. This paper details the development of a mixed-integer programming model that provides a balanced portfolio of construction techniques on bridge sites over a prioritizing selection of bridges at the network level. For this purpose, while a network-level scheme is used to select the bridges for rapid replacement based on their criticalities to the network, a project-level scheme accordingly is conducted to optimize the choice of accelerated construction techniques. To account for the effects of different accelerated construction techniques, the costs associated with each replacement technique is calculated including direct costs from the actual replacement of bridges and indirect costs experienced by network users due to the bridge closure during the maintenance period. Using the mixed-integer programming model, based on the investment budget, the new service performances of bridges, the optimal accelerated construction techniques for different bridges, the bridge replacement strategy and the costs during the entire process are estimated, which could provide the decision makers and stakeholders a detailed understanding of the prioritization process at both the network and project level.