Study on the cyclic bending behaviour of CFRP strengthened full-scale CHS members

Tafsirojjaman, T. ORCID: https://orcid.org/0000-0002-4801-6744 and Fawzia, Sabrina and Thambiratnam, David and Zhao, X. L. (2020) Study on the cyclic bending behaviour of CFRP strengthened full-scale CHS members. Structures, 28. pp. 741-756.

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Abstract

Circular hollow steel (CHS) members have been regarded as structural elements of choice for use in civil infrastructure. Despite the risk of seismic damage of steel structures during an earthquake due to its cyclic characteristics, studies on the cyclic strengthening of CHSs have been minimal. In the present study, a new finite element (FE) modelling approach is developed and applied to study the cyclic performance of carbon fibre reinforced polymer (CFRP) strengthened CHS specimens. The modelling techniques are first validated using results from the authors’ previous experimental work. A detailed parametric study is then carried out to evaluate the effects of CFRP bond length, CFRP layer numbers, ratio of thickness of CFRP to thickness of CHS, CHS member diameter-to-thickness ratio and steel grade on the cyclic performance of the CFRP strengthened CHS members. Results confirm the significant effects of these parameters on the cyclic performance of CFRP strengthened CHS members. The efficiency of CFRP strengthening increases with an increase in the ratio of the thickness of CFRP to the thickness of CHS and also with an increase in the diameter-to-thickness ratio of CHS specimens. Conversely, the efficiency of CFRP strengthening reduces with an increase in the steel grade. Moreover, the ultimate moment capacities obtained from the FE analyses of the bare and CFRP strengthened CHS specimens agree reasonably well with the theoretically predicted values.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Submitted Version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 02 Aug 2021 03:03
Last Modified: 09 Sep 2021 04:48
Uncontrolled Keywords: circular hollow section (CHS), CFRP, strengthening, FE modelling, cyclic loading, parametric study, cyclic design factor
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090599 Civil Engineering not elsewhere classified
09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
09 Engineering > 0905 Civil Engineering > 090504 Earthquake Engineering
Fields of Research (2020): 40 ENGINEERING > 4005 Civil engineering > 400506 Earthquake engineering
40 ENGINEERING > 4005 Civil engineering > 400599 Civil engineering not elsewhere classified
40 ENGINEERING > 4005 Civil engineering > 400510 Structural engineering
40 ENGINEERING > 4016 Materials engineering > 401602 Composite and hybrid materials
Identification Number or DOI: https://doi.org/10.1016/j.istruc.2020.09.015
URI: http://eprints.usq.edu.au/id/eprint/42060

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