01658063

Component

This paper presents a case study in the application of a novel multi-objective optimization approach to develop 20-year improvement and replacement program for approximately 3,200 Iowa state-owned bridges. The optimization model considers three competing objectives: minimization of system-level risk, maximization of system-level condition, and minimization of costs, subject to a set of agency-defined constraints. A range of alternative actions are considered including preservation, rehabilitation, functional improvement, and replacement actions. Annual optimal project lists are generated for a set of planning scenarios. Two types of scenarios were considered: (1) budget scenarios to evaluate the impact of funding levels on system-wide condition and risk measures; and (2) performance target scenarios to evaluate budget requirements to achieve certain performance objectives in terms of system-wide condition or risk measures. The paper presents a step-by-step description of the methodology including deterioration modeling, risk analysis, definition of alternative actions, and the trade-off analysis of planning scenarios.

This paper was sponsored by TRB committee AHD35 Standing Committee on Bridge Management. Alternate title: Multiobjective Optimization for Long-Range Bridge Improvement Programming: An Iowa DOT Case Study.

18-03551

English

16p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

Figures; References; Tables

Bridges; Case studies; Highways; Improvements; Optimization; Programming (Planning)

Iowa Department of Transportation

Bridges and other structures; Highways; Planning and Forecasting

Transportation Research Board Annual Meeting 2018 Paper #18-03551

TRIS, TRB, ATRI

Jan 8 2018 10:53AM