Experimental study on shear performance of RC beams strengthened with NSM CFRP prestressed concrete prisms

Deng, Yu, Ma, Fuqiang, Zhang, Hexin, Wong, Simon, Pankaj, Pankaj, Zhu, Lixue, Ding, Lixing and Bahadori-Jahromi, Ali ORCID: https://orcid.org/0000-0003-0405-7146 (2021) Experimental study on shear performance of RC beams strengthened with NSM CFRP prestressed concrete prisms. Engineering Structures, 235. p. 112004. ISSN 0141-0296

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Abstract

This paper presents an experimental investigation of the shear performance of RC beams strengthened with near surface mounted (NSM) carbon fibre reinforced polymer (CFRP) prestressed concrete prisms (PCPs). The shear behaviour of strengthened beams can be affected by several design variables. In this research, the effect of the following parameters were considered: the prestress level, inclination and spacing of the CFRP-PCPs, and material type of the prism. The control beam had conventional shear steel reinforcement only while the other seven beams were shear strengthened with CFRP-PCPs by varying design parameters mentioned above. All the beams were tested under monotonic loading until they reached the failure load. The experimental results showed that the NSM CFRP-PCPs strengthening technique improves the shear performance of the beams effectively. The strengthened beams that applied the CFRP-PCPs at an inclination of 45° were more efficient in improving the shear capacity compared to vertical CFRP-PCPs. The shear capacity and deformation were enhanced with the increase of prestressing levels of CFRP rods and the decrease of CFRP-PCPs spacing. The failure modes of the strengthened beams were influenced mainly by the spacing and the inclination of the CFRP-PCPs. Moreover, the material type of the prism had little influence on the effectiveness of shear strengthening. The analytical model presented was developed to estimate the shear contribution of NSM CFRP-PCPs and the model was found to predict the shear capacity of the tested beams well.

Item Type: Article
Uncontrolled Keywords: Shear strengthening; Near surface mounted NSM; Carbon fibre reinforced polymer CFRP; Prestressed concrete prisms PCPs
Subjects: Construction and engineering > Civil and environmental engineering
Construction and engineering > Built environment
Construction and engineering > Civil and structural engineering
Construction and engineering
Related URLs:
Depositing User: Ali Bahadori-Jahromi
Date Deposited: 08 Mar 2021 19:31
Last Modified: 10 Mar 2021 12:00
URI: http://repository.uwl.ac.uk/id/eprint/7735

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