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Use of image correlation system to study the bond behavior of FRCM-concrete joints
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0003-1329-555X
Department of Civil, Environmental and Architectural Engineering, University of Padua.
Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla .
Department of Infrastructure, Materials and Structural Engineering, NORUT, .ORCID iD: 0000-0002-8682-876X
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2017 (English)In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 50, no 3, article id 172Article in journal (Refereed) Published
Abstract [en]

This paper presents a non-contact measurement approach, based on digital photogrammetry,applied to the experimental study of the bond behavior of fiber reinforced cementitious matrixcomposite (FRCM) - concrete joints tested in single-lap direct shear tests. The use of digitalphotogrammetry techniques and traditional contact measurement approaches for determiningdisplacement and strain are investigated and compared. The results show that measurements ofstrain in the fiber bundles determined using the image correlation system (ICS) correlate well withthose obtained from electrical strain gauges. However, differences of 38% to 52% were observedbetween the maximum strain measured with either ICS or electrical strain gages attached to thefiber bundles and the maximum strain in the fiber bundles computed from the maximum appliedload. ICS is also used to measure slip and strain of bare fiber bundles, and results show that theload distribution among fiber bundles is non-uniform. The proposed measurement approach showshigher spatial measurement resolution and increased accuracy compared to traditional contactapproaches by enabling measurements in each fiber bundle and overcoming the need to attachadditional elements to the tested specimen.

Place, publisher, year, edition, pages
Springer, 2017. Vol. 50, no 3, article id 172
Keywords [en]
bond, carbon fiber, digital image correlation, direct shear, FRCM composite, point tracking
National Category
Composite Science and Engineering Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-62574DOI: 10.1617/s11527-017-1036-4ISI: 000404147000003Scopus ID: 2-s2.0-85018506006OAI: oai:DiVA.org:ltu-62574DiVA, id: diva2:1083115
Projects
European Network for Durable Reinforcement and Rehabilitation Solutions (endure)
Funder
EU, FP7, Seventh Framework Programme, MC-ITN-2013-607851
Note

Validerad; 2017; Nivå 2; 2017-04-26 (andbra)

Available from: 2017-03-20 Created: 2017-03-20 Last updated: 2018-09-18Bibliographically approved
In thesis
1. FRCM-composites for strengthening concrete walls with openings: Experimental and Numerical Analysis
Open this publication in new window or tab >>FRCM-composites for strengthening concrete walls with openings: Experimental and Numerical Analysis
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Upgrading existing buildings to new functional requirements may require new openings that can weaken the structure, prompting the need for strengthening. In such cases, traditional strengthening solutions, such as creating a reinforced concrete or steel frame around the opening, imply long-term restrictions in the use of the structure.

In this study, the author carries experimental and numerical investigations on fiber reinforced cementitious matrix (FRCM) composites and their effectiveness for strengthening reinforced concrete walls with openings.

To assess the performance of FRCM composite having different fiber types and their suitability for strengthening reinforce concrete walls with openings, single-lap direct shear tests were carried out using carbon, glass, and basalt FRCM-concrete joints. A novel non-contact measurement approach, based on digital image photogrammetry, applied to the experimental study of the bond behavior of FRCM composites was proposed and investigated. The proposed measurement approach showed higher spatial measurement resolution and increased accuracy compared to traditional contact approaches.

The effect of cutout openings on the structural behavior of concrete walls was investigated experimentally, by loading to failure, half-scale, precast reinforced concrete panels with and without openings. The tested specimens were two-way action panels to which axial load with a small eccentricity was applied, thus the tested panels were representative of wall panels in buildings. The effect of cutout openings on the global behavior of a building structure was investigated through finite element analysis of an existing building where cutout openings were introduced in wall panels. Depending on their size, cutout openings can significantly decrease the capacity of the wall. The effectiveness of FRCM strengthening to restore the capacity walls with cutout openings was investigated experimentally. FRCM strengthening increased the capacity of walls having small door type openings (opening width was 25% of the wall’s width) to that of the solid wall. The capacity of the walls with large cutout openings was (opening width was 50% of the wall’s width) was increased to 75% of the solid wall’s capacity. The numerical and experimental analysis indicated that the decrease in axial load caused by cutout openings was proportional to the width opening. However, the numerical analysis of buildings structure indicated that the effects of openings on the buildings load carrying capacity are less severe.

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2018
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Keywords
FRCM, reinforced concrete, walls, openings, strenghtening
National Category
Building Technologies Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-70886 (URN)978-91-7790-205-8 (ISBN)978-91-7790-206-5 (ISBN)
Public defence
2018-11-14, F1031, Luleå University of Technology, Luleå, 09:00 (English)
Opponent
Supervisors
Available from: 2018-09-25 Created: 2018-09-18 Last updated: 2018-09-25Bibliographically approved

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Sabau, CristianSas, GabrielTäljsten, Björn

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