LIFETIME MAINTENANCE OPTIMIZATION FOR CONCRETE BRIDGE DECKS
This paper presents a mathematical optimization approach to identifying the concrete bridge deck maintenance plans that have the minimum life-cycle maintenance costs, meanwhile satisfying the multiple limit states of strength and serviceability for a targeted lifetime period. The strength-based limit state of a concrete bridge deck is quantified by using the component reliability index of the deck, where the deterioration of the reliability index over time is represented by the reliability index profile. Similarly, the serviceability-based limit state of the bridge deck is represented by the condition index profile. The deterioration models of both reliability and condition index profiles of a concrete bridge deck are discussed, along with the predefined threshold requirements. Based on the effects of different maintenance actions on the concrete bridge deck reliability and condition index profiles, as well as the relative costs of those maintenance actions, a dynamic programming (DP) procedure has been developed to identify all feasible maintenance plans for the targeted lifetime period. Since these identified feasible maintenance plans may require performing different combinations of the bridge deck maintenance actions with different application times, the optimal bridge deck maintenance plan is defined as the one that has the minimum lifetime maintenance costs in terms of the net present values. Finally, the sensitivity studies are performed with Monte Carlo simulations for several random variables and parameters considered in the proposed DP procedure. A numerical example is provided for illustration purposes.
Concrete bridge deck deterioration Maintenance optimization Dynamic programming
LIU, Ming FRANGOPOL, Dan M.
Relcon Infrastructure Management, Inc., Littleton, CO, USA Fazlur R. Khan Endowed Chair of Structural Engineering and Architecture Center for Advanced Technolo
国际会议
上海
英文
402-413
2007-05-16（万方平台首次上网日期，不代表论文的发表时间）