Crack resistance of RC columns strengthened by CFRP under 30% of uls loading

Blikharskyy, Yaroslav; Khmil, Roman; Selejdak, Jacek; Katunský, Dušan; Tytarenko, Roman; Blikharskyy, Zinoviy

doi:10.2478/czoto-2023-0005

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Tytuł artykułu

Crack resistance of RC columns strengthened by CFRP under 30% of uls loading

Autorzy

Blikharskyy Yaroslav , Khmil Roman , Selejdak Jacek , Katunský Dušan , Tytarenko Roman , Blikharskyy Zinoviy

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DOI

10.2478/czoto-2023-0005

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Języki publikacji

Abstrakty

Nowadays, among many existing reinforced concrete (RC) columns, it is impossible to find samples that work only as centrally compressed members – their vast majority work as eccentrically compressed members. On the other hand, the significant volumes of reconstruction in Ukraine will require studies of the work of various RC structures strengthened under different load levels. In addition to choosing the method of strengthening itself, the relevant tasks will be studies of bearing capacity, crack resistance, reliability (including residual resource) of structures, etc. This article presents the method of crack resistance experimental study of eccentrically compressed RC members. The proposed method was tested on unstrengthened (ordinary) and strengthened (in a stretched zone) RC columns; the results of experimental studies for ordinary and strengthened samples were also obtained. The columns were strengthened with a composite material (from many carbon-fiber-reinforced polymers) – the Sika Carbodur S512 strip. The feature of the crack resistance study of columns was that they were strengthened under the initial load level of 30 %. As a result of experimental research on the samples strengthened under load, we stated that the width of the crack decreased on average by about 36 % (at the comparable values of the active load). In turn, the average maximum length of cracks decreased to about 50 % of the height of the cross-section (for unstrengthened samples, this value was approximately 80 %), and the eccentric compressive ultimate load was increased by about 33 %.

Słowa kluczowe

CFRP strip crack resistance strengthening initial load level RC column

odporność na pękanie wzmacnianie początkowy poziom obciążenia pasek CFRP kolumna RC

Wydawca

De Gruyter

Czasopismo

System Safety : Human - Technical Facility - Environment

Rocznik

2023

Tom

Vol. 5, iss. 1

Strony

36--45

Opis fizyczny

Bibliogr. 45 poz., rys., tab.

Twórcy

autor

Blikharskyy Yaroslav

Lviv Polytechnic National University, Ukraine

https://orcid.org/0000-0002-3374-9195

autor

Khmil Roman

Lviv Polytechnic National University, Ukraine

https://orcid.org/0000-0001-7578-8750

autor

Selejdak Jacek

Czestochowa University of Technology, Poland

https://orcid.org/0000-0001-9854-5962

autor

Katunský Dušan

Technical University of Kosice, Slovakia

https://orcid.org/0000-0002-6436-5792

autor

Tytarenko Roman

Lviv Polytechnic National University, Ukraine

https://orcid.org/0000-0002-4550-6422

autor

Blikharskyy Zinoviy

Czestochowa University of Technology, Poland

https://orcid.org/0000-0002-4823-6405

Bibliografia

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