Abstract
As the concept and methods of maintenance of infrastructure systems are receiving increasing attention, the optimal maintenance strategy for a group of structures is a promising research topic. Among the factors affecting the decision-making of optimal maintenance strategy for civil infrastructure systems, the target service life and user cost estimation approach are significant. Currently, user cost estimation at the project level is widely adopted, whereas the user cost estimation at the network level is in the development stage. This paper investigates the impact of several factors on the risk-informed optimal maintenance strategy for a bridge network under corrosion, including target service life, user cost estimation approach, and correlation among bridge safety margins. The novelty of this paper consists of considering the effects of these factors on the optimal maintenance strategy of bridge networks. These effects, which are crucial for adopting the optimal maintenance strategy, were not investigated in a detailed manner previously. Two different maintenance strategies are considered for the maintenance of corroded steel girders. The former is to conduct replacement with new carbon steel girders, and the latter is to use A709-50CR steel, where CR stands for corrosion resistant, a new type of steel with a chromium content similar to that of martensitic stainless steel, in replacement actions. Using an existing bridge network under a low life-cycle risk threshold, it is shown that replacement based on A709-50CR girders results in a reduced life-cycle network maintenance cost than replacement based on carbon steel girders. Also, the project-level approach to estimate user cost can lead to a substantial increase in the life-cycle network maintenance cost compared with the network-level approach.
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Data Availability Statement
All the data related to this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors are grateful for the support provided by (1) the Center for Integrated Asset Management for Multimodal Transportation Infrastructure Systems (CIAMTIS), a US Department of Transportation University Transportation Center, under federal grant number 69A3551847103, and (2) the Commonwealth of Pennsylvania Department of Community and Economic Development through the Pennsylvania Infrastructure Technology (PITA). The authors would like to thank Mr. Thomas P Macioce, PE, from the Pennsylvania Department of Transportation for providing the bridge drawings used in the case study. The authors would also like to thank Dr. Thomas P. Murphy from Modjeski and Masters, Inc., for his support. The opinions and conclusions presented this paper are those of the authors and do not necessarily reflect the views of the sponsoring organizations.
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Published In
ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part A: Civil Engineering
Volume 8 • Issue 4 • December 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jan 26, 2022
Accepted: May 10, 2022
Published online: Aug 27, 2022
Published in print: Dec 1, 2022
Discussion open until: Jan 27, 2023
ASCE Technical Topics:
- Architectural engineering
- Benefit cost ratios
- Bridge engineering
- Bridge management
- Bridges
- Bridges (by material)
- Building design
- Building management
- Business management
- Cold-formed steel
- Construction costs
- Construction engineering
- Construction management
- Design (by type)
- Engineering fundamentals
- Engineering materials (by type)
- Financial management
- Maintenance and operation
- Materials engineering
- Metals (material)
- Practice and Profession
- Project management
- Service life
- Stainless steel
- Steel
- Steel bridges
- Structural engineering
- Wood bridges
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