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原文传递 Utility and Information Analysis for Optimum Inspection of Fatigue-Sensitive Structures

题名：	Utility and Information Analysis for Optimum Inspection of Fatigue-Sensitive Structures
正文语种：	英文
作者：	Yan Liu, A.M.ASCE1; Dan M. Frangopol, Dist.M.ASCE2
作者单位：	1Associate Professor, School of Naval Architecture and Ocean Engineering, Huazhong Univ. of Science and Technology, 1037 Luoyu Rd., Wuhan 430074 China; formerly, Postdoctoral Research Associate, Dept. of Civil and Environmental Engineering, Engineering Research Center for Advanced Technology for Large Structural Systems, Lehigh Univ., 117 ATLSS Dr., Bethlehem, PA 18015. 2The Fazlur R. Khan Endowed Chair of Structural Engineering and Architecture, Dept. of Civil and Environmental Engineering, Engineering Research Center for Advanced Technology for Large Structural Systems, Lehigh Univ., 117 ATLSS Dr., Bethlehem, PA 18015 (corresponding author).
关键词：	Fatigue; Inspection; Information value; Utility; Decision making; Deteriorating structures; Uncertainty
摘要：	Fatigue cracking is considered the most prevalent damage for welded steel structures like bridges and ships. Inspections are normally planned in the service life to assess fatigue damages in order to ensure structural safety and serviceability. Whether or not cracks are found, the inspection results provide value for fatigue damage assessment and risk mitigation. This paper aims to emphasize the value of inspection based on the information gained for fatigue crack prognosis. The probabilistic inspection results are used to update the prior distribution to a posterior distribution of fatigue damage. The change from prior to posterior distribution is quantified as the information gained from inspection. The time-variant inspection information metrics are further analyzed with utility theory to consider the attitude and preference of the decision maker toward the inspection outcome at a certain point in time. This paper presents an integrated decision-making framework for inspection planning, addressing the information perspective of inspection choice and schedule. The recommended optimum inspection plan is expected to provide the highest utility to the decision maker in the life-cycle management of aging structures. The proposed framework is applied to a fatigue-critical detail of a ship structure.
出版年：	2019
期刊名称：	Journal of Structural Engineering
卷：	145
期：	2
页码：	1-12