Experimental Study on Shear Performance of RC Beams Strengthened with NSM CFRP Pre-stressed Concrete Prisms

Yu Deng, Fuqiang Ma, Hexin Zhang, Simon Wong, Pankaj Pankaj, Lixue Zhu, Lixing Ding, Ali Bahadori-Jahromi

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish
Article number112004
Number of pages35
JournalEngineering Structures
Volume235
Early online date3 Mar 2021
DOIs
Publication statusPublished - 15 May 2021

Keywords

  • Shear Strengthening
  • near surface mounted NSM
  • carbon fibre reinforced polymer CFRP
  • prestressed concrete prisms PCPs

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