Quantification of the Posterior Utilities of SHM Campaigns on an Orthotropic Steel Bridge Deck

Lijia Long, Isaac Farreras Alcover, Sebastian Thöns

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


This paper contains a quantification and decision theoretical optimization of the posterior utilities for several options for monitoring campaigns on the particular case of fatigue life predictions of an orthotropic steel deck. The monitoring campaigns are defined by varying monitoring durations and phases. The decision analysis is performed with real data from the Structural Health Monitoring (SHM) of the Great Belt Bridge (Denmark) which, among others, consist of measured strains, pavement temperatures and traffic intensities. The fatigue loading prediction model is based on regression models linking daily averaged pavement temperatures, daily aggregated heavy-traffic counts and derived S-N fatigue damages, all of them derived from the outcomes of different monitoring campaigns. A probabilistic methodology is utilized to calculate the fatigue reliability profiles of selected instrumented welded joints. The posterior utilities of SHM campaigns are then quantified by considering the structural fatigue reliability, various monitoring campaigns and the corresponding cost-benefit models. The decisions of identifying the optimal monitoring campaign and of extending the service life or not in conjunction with monitoring results are modelled. The optimal monitoring campaign is identified - retrospectively - by maximizing the expected benefits and minimize risks in dependency of the monitoring duration and the monitoring associated costs. The results, despite relying on a number of simplistic assumptions, pave the way towards the use of pre-posterior decision support to optimise the design of monitoring campaigns for similar bridges, with an overall goal to proof the cost efficiency of SHM approaches to civil infrastructure management.
Original languageEnglish
Title of host publicationProceedings of the Twelfth International Workshop on Structural Health Monitoring
EditorsFu-Kuo Chang, Alfredo Güemes
Number of pages8
PublisherDEStech Publications, Inc.
Publication date2019
ISBN (Print)978-1-60595-601-5
Publication statusPublished - 2019
EventThe 12th International Workshop on Structural Health Monitoring - Stanford, United States
Duration: 10 Sep 201912 Sep 2019
Conference number: 12


ConferenceThe 12th International Workshop on Structural Health Monitoring
Country/TerritoryUnited States


Dive into the research topics of 'Quantification of the Posterior Utilities of SHM Campaigns on an Orthotropic Steel Bridge Deck'. Together they form a unique fingerprint.

Cite this