Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Laboratory investigation of the effect of opening on the capacity of deep concrete beams reinforced with GFRP bars

Document Type : Original Article

Authors
Mahdi Mirzaie Aliabadi 1
Peyman Homami 2
Ali Massumi 3
1 PhD Student, Faculty of Engineering, Kharazmi University, Tehran, Iran
2 Associate Professor, Faculty of Engineering, Kharazmi University, Tehran, Iran
3 Professor,, Faculty of Engineering, Kharazmi University, Tehran, Iran
10.22065/jsce.2024.433193.3317
Abstract
The use of composite rebars is increasing in the construction industry due to their characteristics such as high tensile strength, corrosion resistance, light weight and reasonable price compared to steel rebars, however, the behavior of deep concrete beams with opening, reinforced with GFRP rebars Less studied. In this research, the behavior of 7 deep reinforced concrete beams with and without openings reinforced with GFRP rebar was investigated under 4-point bending test. Dimensions, number and placement of openings were included as research variables. In all samples, the ratio of the shear span to the depth of the beam is 0.9. The results of the research show that placing an opening in the load transfer path, with diameters of 14 and 24 cm, respectively, reduces the final strength of the beams by 68 and 75% compared to the beam without opening. The final strength of the samples decreases by 6% by increasing the number of openings with a diameter of 14 cm from one to two, and by 3% for the samples with an increase of the number of openings with a diameter of 24 cm from one to two. By examining the results, it was found that placing the opening in the middle of the beam opening does not reduce the strength of the beam. The failure mode in all beams is from shear type and rupture along the load application site to the support, and the first main cracks formed in the beams are of bending, shearing or bending-shearing type depending on the dimensions of the opening and its location. The test results were compared with the relations in the ACI regulations and it was determined that the shear capacity of the beams based on the relations of the regulations is on average 14% lower than the test results.
Keywords
Deep beam with opening
GFRP rebar
Four-point bending
Crack propagation
Failure mode

Subjects

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Journal of Structural and Construction Engineering
Volume 11, Issue 11 - Serial Number 88
February 2025
Pages 267-292

  • Receive Date 19 January 2024
  • Revise Date 09 May 2024
  • Accept Date 05 June 2024