Probabilistic bicriterion optimum inspection/monitoring planning: applications to naval ships and bridges under fatigue

Abstract

Initiation and propagation of fatigue cracks in steel structures induced by repetitive actions are highly random due to both aleatory and epistemic uncertainties related to material properties, loads, damage, modelling and other factors. For this reason, a probabilistic approach is necessary to predict the fatigue crack growth damage. This study presents a probabilistic approach for combined inspection/monitoring planning for fatigue-sensitive structures considering uncertainties associated with fatigue crack initiation, propagation and damage detection. This combined inspection/monitoring planning is the solution of an optimisation formulation, where the objective is minimising the expected damage detection delay. Furthermore, this formulation is extended to a bicriterion optimisation considering the conflicting relation between expected damage detection delay and cost. A set of Pareto solutions is obtained by solving this bicriterion optimisation problem. From this set, a solution can be selected balancing in an optimum manner inspection and monitoring times, quality of inspections, monitoring duration, and number of inspections and monitorings. The proposed approach is applied to a naval ship and a bridge subjected to fatigue.

Practical Applications of Life-Cycle Considerations in Sustainable Development of Infrastructure

“…In the proposed framework, this process is performed using a probabilistic platform considering various uncertainties associated with the LCM. Various goals for the life-cycle optimization can be taken into account, including minimizing the total life-cycle risk (Zhu and Frangopol 2013), minimizing the expected annual system failure rate (Barone et al 2013), maximizing the expected service life (Kim et al 2011;Kim et al 2013), minimizing the damage detection delay (Kim and Frangopol 2011c;Kim and Frangopol 2011d;Kim and Frangopol 2012), maximizing the probability of damage detection , and minimizing the life-cycle cost ). Additionally, two or more conflicting objectives can be Total Risk…”

Performance assessment and design of ultra-high performance concrete (UHPC) structures incorporating life-cycle cost and environmental impacts

“…Life-cycle assessment (LCA) is defined as the evaluation of a system throughout its life cycle from cradle to grave (Kim and Frangopol 2012). Generally, higher initial cost with a better quality can result in a lower operation and maintenance cost.…”

Risk-informed life-cycle optimum inspection and maintenance of ship structures considering corrosion and fatigue

“…Moreover, load effects on ship structures contain high levels of uncertainty and may exceed the associated design loads. Inspection and maintenance of aging ship structures are needed to ensure satisfactory structural performance during their life-cycle (Kim and Frangopol, 2012;Kwon et al, 2013;Zhu and Frangopol, 2013a;Zhu and Frangopol, 2013b). In general, the most significant strength deterioration mechanisms associated with ship structures are corrosion and fatigue (Guedes Soares and Garbatov, 1999;Kwon and Frangopol, 2012).…”