Role of size on the compression behaviour of hybrid FRP strengthened square RC columns – Experimental and finite element studies

Balla, Taraka M.R. and Suriya Prakash, S. and Rajagopal, Amirtham (2023) Role of size on the compression behaviour of hybrid FRP strengthened square RC columns – Experimental and finite element studies. Composite Structures, 303. pp. 1-20. ISSN 0263-8223

Text
Composite_Structures_.pdf - Published Version
Restricted to Registered users only
Download (11MB) | Request a copy

Abstract

Confinement of reinforced concrete (RC) columns through external bonding (EB) of fibre-reinforced polymer (FRP) composite becomes less effective in non-circular sections. The effectiveness of FRP confinement reduces with an increase in the size of the cross-section. Hence, it is essential to develop an effective FRP strengthening technique for large-sized square columns. Hybrid FRP strengthening combines the advantage of both near-surface mounting (NSM) and EB strengthening procedures for enhancing the overall performance of RC members under different load combinations. Sixteen square RC columns of various size ratios 1.0 and 1.5 were cast, strengthened and tested to understand the efficacy of the hybrid FRP technique. In addition to the tests, detailed nonlinear finite element (FE) models were developed and validated with the test results and data from the literature. Results show that the efficiency of EB and Hybrid FRP strengthening decreased with the increase in sectional ratio of square columns. Hybrid FRP strengthening improved strength and ductility for all size ratios compared to EB or NSM FRP strengthening alone. Using validated FE models, a parametric study was also conducted to understand the effect of EB and NSM reinforcement ratio and column size on the efficiency of Hybrid FRP strengthening. © 2022 Elsevier Ltd

[error in script]

IITH Creators:

IITH Creators	ORCiD
Suriya Prakash, S.	UNSPECIFIED
Rajagopal, Amirtham	https://orcid.org/0000-0002-1328-0430

Item Type:

Article

Additional Information:

The first author is thankful to the Ministry of Education, India, for providing the fellowship. The authors acknowledge the help provided by Dr Chellapandian for the critical review of this manuscript. We would also acknowledge the SPARC scheme and DST Extramural scheme for providing financial support for the experimental part of this work.

Uncontrolled Keywords:

Axial compression; EB; HYB strengthening; NSM; RC column; Size effect

Subjects:

Civil Engineering

Divisions:

Department of Civil Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

28 Oct 2022 10:00

Last Modified:

28 Oct 2022 10:00