Quantification of digital image correlation applicability related to in-situ proof load testing of bridges

Christian Overgaard Christensen, Eva Lantsoght, Jacob Wittrup Schmidt

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

Advanced crack monitoring is crucial for high precision response- and threshold evaluation when performing proof- and diagnostic load tests on existing concrete structures. Mostly, crack monitoring techniques involve one monitoring method, which provide thresholds with regard to stop criteria and characterization information. In the ongoing Danish bridge testing research program, it is hypothesized that several independent monitoring techniques are needed to reduce uncertainties related to crack detection and categorization. A number of novel monitoring methods are used in the research project. A special focus is however dedicated to two-dimensional digital image correlation (2D-DIC) and acoustic emission (AE). This paper presents initial research concerning evaluations related to digital image correlation based on sub-component beam tests performed in the DTU CasMat laboratory facility. The tested beams were prefabricated as TT-elements with a length of 6.4 m and cut into two T-beam elements. The test matrix consisted of ten beams strengthened with carbon fiber reinforced polymer (CFRP) in different configurations with and without post-tensioning of the CFRP, thus resulting in different crack initiation behavior. The investigations in this paper include: (1) time of crack detection compared to visual detection, (2) time of crack detection compared to time of crack width threshold values, and (3) crack width evaluation using 2D-DIC strain correction for out-of-plane deflection. The results show that cracks can be detected prior to both visual detection and significant stiffness change. After detection, crack development can be monitored for crack width stop criteria. Crack widths can also be successfully monitored for surfaces subjected to out-of-plane movement using a geometric correction method. The methodology is hypothesized to be of significant importance in future testing of full-scale concrete slab bridges in the Danish bridge testing project.
Original languageEnglish
Title of host publicationSMAR 2019 - Fifth Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures
Number of pages8
Publication statusPublished - 2019
Event5th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures - Dorint Sanssouci Berlin-Potsdam, Potsdam, Germany
Duration: 27 Aug 201929 Aug 2019
https://www.smar2019.org/

Conference

Conference5th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures
Abbreviated titleSMAR 2019
CountryGermany
CityPotsdam
Period27/08/1929/08/19
Internet address

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