Commentary on the flat-jack test – factors influencing the measurements
Authors:
- Dawid Łątka
Abstract
The paper presents the results of several flat-jack tests conducted on large sections of brick walls prepared in a laboratory. The influence of two basic factors was studied – the shape of the flat-jacks and distance between them – on the magnitude of the recorded strains. The three most common flat-jack shapes (semi-circle, rounded-rectangle and rectangle) were used for that purpose. The aforementioned spacing adopted for the purpose of the test was 3, 5 and 7 layers of bricks forming the analyzed brick wall specimen. Both of these factors have a significant impact on the boundary conditions of the test and the recorded results. For the purpose of comparison, brick prisms of a height corresponding to the spacing of the flat-jacks were cut out of the tested walls. The entire walls and then the cut out prisms were subjected to a load with a compressive force in order to estimate the modulus of elasticity E of the brick wall. Comparison of the values obtained shows that the semi-circle flat-jacks widely used in engineering practice might overestimate the rigidity of the wall tested. The reason seems to be the small surface area of this type of flat-jack and insufficient depth of its placement inside the wall bed joint. Only rounded-rectangle and rectangle flat-jacks allowed for estimating results that were more similar to those recorded in the other tests on masonry. Double flat-jacks testing allows for a minor-destructive assessment of the deformation parameters of the outer layer of brick wall. The recorded values were comparable with the results obtained by other authors.
- Record ID
- CUTa1c7f5fdc09f403eae77dc6c9a637faa
- Publication categories
- ; ;
- Author
- Pages
- 568-580
- Other elements of collation
- Bibliografia (liczba pozycji) - 41; Oznaczenie streszczenia - Abstr.; Data udostępnienia on-line - 2023-09-04
- Substantive notes
- Data wyd. wg daty cop.
- Book
- Endo Yohei, Yohei Endo Hanazato Toshikazu Toshikazu Hanazato (eds.): Structural Analysis of Historical Constructions : SAHC 2023. Vol. 1, RILEM Bookseries, no. Vol. 47, 2024, Cham, Springer, Springer, ISBN 978-3-031-39603-8 (eBook)
- Keywords in English
- flat-jack test, minor-destructive investigation, brick masonry, mechanical properties, structural health monitoring, masonry deformability
- ASJC Classification
- ; ;
- DOI
- DOI:10.1007/978-3-031-39603-8_46 Opening in a new tab
- URL
- https://link.springer.com/chapter/10.1007/978-3-031-39603-8_46 Opening in a new tab
- Language
- eng (en) English
- Score (nominal)
- 20
- Score source
- publisherList
- Score
- Publication indicators
- Additional fields
- Indeksowana w: Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUTa1c7f5fdc09f403eae77dc6c9a637faa/
- URN
urn:pkr-prod:CUTa1c7f5fdc09f403eae77dc6c9a637faa
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.