Optimal Inspection and Repair Strategies for Structural Systems
A model for reliability-based repair and maintenance strategies of structural systems is described. The total expected costs in the lifetime of the structure are minimized with the number of inspections, the number and positions of the inspected points, the inspection efforts, the repair criteria and a design variable as optimization variables. A model for estimating the total expected costs for structural systems is given including the costs associated with the loss of individual structural members as well as the costs associated with the loss of at least one element of a particular group of structural members and the costs associated with the simultaneous loss of all members of a specific group of structural members. The approach is based on the pre-posteriori analysis from the classical decision theory. Special emphasis is given to the problem of selecting the number of points in the structure to be inspected and to select the location of the points to be inspected. It is shown how information obtained through inspections and through the periods of normal operating of the structure can be used to update the inspection and maintenance planning. Finally, a small example is given illustrating the suggested approach.
KeywordsStructural System Reliability Index Repair Strategy Failure Cost Inspection Cost
Unable to display preview. Download preview PDF.
- Raiffa, H. and Schlaifer, R. Applied Statistical Decision Theory, Harward University Press, Cambridge, Mass., 1961.Google Scholar
- Benjamin, J.R. and Cornell, C.A. Probability, Statistics and Decision for Civil Engineers, McGraw-Hill, 1970.Google Scholar
- Schittkowski, K. NLPQL: A FORTRAN Subroutine Solving Non-linear Programming Problems, Annals of Operations Research, 1986.Google Scholar
- Madsen, H.O., Sorensen, J.D. and Olesen, R. Optimal Inspection Planning for Fatigue Damage of Offshore Structures, Proceedings ICOSSAR 89, San Francisco 1989, pp. 2099–2106.Google Scholar
- Fujimoto, Y., Itagaki, H. Itoh, S., Asada, H. and Shinozuka, M., Bayesian Reliability Analysis of Structures with Multiple Components, Proceedings ICOSSAR 89, San Francisco 1989, pp. 2143–2146.Google Scholar
- Fujita, M., Schall, G. and Rackwitz, R. Adaptive Reliability Based Inspection Strategies for Structures Subject to Fatigue, Proceedings ICOSSAR 89, San Francisco 1989, pp. 1619–1626.Google Scholar
- Madsen, H.O. and Sorensen, J.D. Probability-Based Optimization of Fatigue Design Inspection and Maintenance, Presented at Int. Symp. on Offshore Structures, July 1990, University of Glasgow.Google Scholar
- Zettlemoyer N., Buitrago, J. and Wirsching, P.H. Probabilistic Concepts for Offshore Fatigue Inspections, Proceedings of OMAE 1990, Houston, Texas, pp. 249–258.Google Scholar
- Bryla, Ph., Faber, M.H. and Rackwitz, R. Second Order Methods in Time Variant Reliability Problems Proceedings of OMAE 1991, Stavanger, Norway, pp. 143–150.Google Scholar
- Sørensen, J.D., Faber, M.H., Thoft-Christensen, P. and Rackwitz, R. Modeling in Optimal Inspection and Repair, Proceedings of OMAE 1991, Stavanger, Norway, pp. 281–288.Google Scholar