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Zhou Y.,PLA University of Science and Technology | Gou M.,The First Research Division | Zhang F.,Transportation Institute | Zhang S.,Transportation Institute | Wang D.,PLA University of Science and Technology
Materials and Design | Year: 2013

Carbon fiber reinforced polymer (CFRP) can be used to strengthen the reinforced concrete (RC) beams. But premature debonding is the main failure model in ordinary bond technique, and the strengthening effect is limited. In order to improve bonding and restricting sliding displacement, Friction Hybrid Bonded FRP Technique (FHB-FRP) is developed. Six simple-span RC specimen beams with different strengthened methods were tested in four-point bending. The experiment results indicate that FRP debonding can be effectively prevented by the FHB-FRP strengthened beam. The ultimate load-carrying capacity of the specimen strengthened by FHB-FRP technique is able to increase by a factor of 2.13 times compared with the beam strengthened with ordinary bond technique (U-jacketing technique). In addition, the cracking and yielding loads are improved more significantly by FHB-FRP technique than U-jacketing technique. Specimens strengthened with FHB-FRP technique have cracks with a more limited distribution and width. Finally, the finite element method (FEM) is conducted to simulate the behavior of the test specimens. The results obtained from the finite element method are compared with experiment. Excellent agreements have been achieved in the comparison of results. © 2013 Elsevier Ltd. Source

Zhou Y.,PLA University of Science and Technology | Jiang K.,PLA University of Science and Technology | Gou M.,The First Research Division | Li N.,The First Research Division | And 4 more authors.
Materials and Design | Year: 2014

In order to improve the debonding strength of double shear lap (DSL) joints between aluminum plates and carbon fiber reinforced plastic (CFRP) plates, a hybrid bonded fiber reinforced plastics (HB-FRP) technique was proposed in this paper. Debonding strength of the HB-FRP was tested and investigated analytically and numerically. Fracture failure of the aluminum-adhesive interface was identified as the dominant failure mode of the joint. Compared with normal bond joints, the debonding strength of HB-FRP joints can be increased by 71% in experiments. The strain energy release rate (SERR) criterion based on linear elastic fracture mechanics (LEFM) was adopted to estimate the debonding strength of bond joints. Good agreement among theoretical predictions, numerical simulations and experimental data were achieved. © 2014 Elsevier Ltd. Source

Zhou Y.,PLA University of Science and Technology | Zhou Y.,The First Research Division | Fan H.,PLA University of Science and Technology | Fan H.,Nanjing University of Aeronautics and Astronautics | And 6 more authors.
Composite Structures | Year: 2014

To improve the flexural rigidity and load carrying capacity, aluminum beams were strengthened by carbon fiber reinforced plastic (CFRP) sheets. A hybrid bond technique with mechanical fastening was suggested to improve the reinforcement efficiency. Four-point-bending experiments were carried out to reveal the flexural behaviors and failure styles of the strengthened beams. Flexural rigidity can be increased at a ratio of 32.8%. The hybrid bond technique changes the failure style from normal debonding to tangential slippery and improves the load carrying capacity at a ratio of 31.13%. It is found that CFRP hybrid bond method is more efficient for aluminum members than steel ones. A simplified analytical method based on full interaction between the beam and the reinforcement was suggested to predict the nonlinear behaviors, flexural rigidity and load carrying of the strengthened beam. Based on the experiments and analyses, a design procedure was put forward for CFRP sheets to strengthen aluminum structural members using hybrid bond technique. © 2014 Elsevier Ltd. Source

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