Numerical study on the flexural performance of RC beams with externally bonded CFRP sheets

  • Nguyen Ngoc Tan Faculty of Building and Industrial Construction, Hanoi University of Civil Engineering, 55 Giai Phong road, Hai Ba Trung district, Hanoi, Vietnam
  • Nguyen Trung Kien Faculty of Building and Industrial Construction, Hanoi University of Civil Engineering, 55 Giai Phong road, Hai Ba Trung district, Hanoi, Vietnam
  • Nguyen Hoang Giang Faculty of Building and Industrial Construction, Hanoi University of Civil Engineering, 55 Giai Phong road, Hai Ba Trung district, Hanoi, Vietnam
Keywords: reinforced concrete beams, flexural strengthening, flexural performance, bond-slip behavior, carbon fiber-reinforced polymer

Abstract

The numerical investigations on the structural performance of reinforced concrete (RC) beam strengthened with externally bonded carbon fiber-reinforced polymer (CFRP) sheets are presented. The nonlinear characteristics of materials (i.e., stress-strain relationships of steel reinforcement, concrete, CFRP, and CFRP/concrete bond stress-slip behavior) were adopted in three-dimensional finite element (FE) models. The validation of FE models was conducted by comparing the laboratory works carried out on two RC beam specimens with 2000 mm length, 300 mm height, and 120 mm width. The numerical results show a good correlation with the experimental results of the beam specimens, such as load-displacement curves, crack patterns, and failure modes. They allow confirming the capability of the developed FE model to predict the flexural performance of strengthened beams considering CFRP/concrete interfacial behavior. Furthermore, parametric investigations were performed to determine the effect of flexural strengthening schemes, CFRP length with or without U-wraps, and multiple CFRP layers on the flexural performance of strengthened beams.

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Published
31-10-2021
How to Cite
Tan, N. N., Kien, N. T., & Giang, N. H. (2021). Numerical study on the flexural performance of RC beams with externally bonded CFRP sheets. Journal of Science and Technology in Civil Engineering (STCE) - HUCE, 15(4), 182-196. https://doi.org/10.31814/stce.huce(nuce)2021-15(4)-16
Section
Research Papers