Fatigue reliability analysis considering corrosion effects and integrating SHM information. (1st December 2022)

• Record Type: Journal Article
• Authors: Han, Xu; Frangopol, Dan M.
• Is Part Of: Engineering structures. Volume 272(2022)
• Publication Date: 2022-12-01
• Subjects: Fatigue -- Corrosion -- Reliability -- SHM -- Finite element analysis; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2022.114967
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Time-variant reliability of fatigue-prone details subjected to corrosion-enhanced fatigue. Utilization of Structural Health Monitoring (SHM) information. Finite element (FE) analysis to identify the most critical location at fatigue-prone details. FE analysis to consider the influence of corrosion on the effective stress range obtained through SHM. Abstract: Fatigue cracking is a common problem facing steel bridges. S-N curves have been adopted in design specifications to offer guidance on fatigue design of these bridges. Structural health monitoring (SHM) techniques can provide reliable information on stress states at fatigue-prone details using strain sensors, thereby circumventing complex theoretical analyses. When corrosion is present, simply relying on SHM information obtained through the monitoring period may not be sufficient to reliably estimate the damage incurred by corrosion-enhanced fatigue as corrosion is a long-term process and the time-variant effect of corrosion on fatigue needs to be determined. In this paper, time-variant analysis is used to estimate the reliability of fatigue-prone details at the coped region of a transverse diaphragm in a tied-arch bridge. Stress histograms obtained based on SHM information associated with this case study are utilized to establish the distribution of the original effective stress. Finite element analysis is conducted for (a) determining the spatial adjustment factor (SAF) to adjust the stress range obtained at the location of strain sensors, and (b) assessing the effect of corrosion on the effective stress range. The reliability analysis results show that for the fatigue details investigated in this case study, corrosion has a significant effect on the fatigue reliability and, therefore, should be considered in the life-cycle management of fatigue-prone details.