Experimental and numerical simulations of HB-FRP flexural reinforced beam

doi:10.19936/j.cnki.2096-8000.20240728.010

Abstract

Abstract: In order to study the flexural performance of concrete (RC) beams reinforced with hybrid bond FRP (HB-FRP), three-point bending tests were conducted on eight HB-FRP reinforced beams to investigate the effects of bolt torque, fastener spacing, anchorage distribution pattern and FRP plate bonding method on the damage pattern, load-deflection curve and FRP strain distribution of the specimens. Based on the finite element software ABAQUS, a finite element model of HB-FRP strengthened RC beams was established, and the model was verified by test results and parametric analysis was carried out. The results show that the ultimate load of HB-FRP strengthened beams is increased by 71%~156% compared with unreinforced beams, and the ultimate load and FRP utilization rate increase with the increase of bolt torque and decrease with the increase of fastener spacing; FRP plate peeling damage occurs in all specimens by eliminating the bond between fasteners and FRP plates; the reinforcement effect of span-centered and end-centered anchorage is unstable and prone to early damage occurred; the established calculation model of HB-FRP reinforced RC beams has good accuracy and can be used for the simulation of flexural performance; the increase of fastener width and carbon plate width increased the ultimate load of HB-FRP reinforced beams; the high bolt torque and fastener width will lead to premature concrete damage in the compression zone; the utilization rate of FRP decreases with the increase of FRP width.

Key words: reinforcement, FRP, flexual resistance, finite element, anchorage parameters, composites

CLC Number:

TB332

LI Yan, WEI Qi'an, SHI Nan, GAO Lei, WANG Jiabin, HUANG Yue. Experimental and numerical simulations of HB-FRP flexural reinforced beam[J]. COMPOSITES SCIENCE AND ENGINEERING, 2024, 0(7): 74-85.

References

[1] BAKIS C E, BANK L C, BROWN V L, et al. Fiber-reinforced polymer composites for construction-state-of-the-art review[J]. Journal of Composites for Construction, 2002, 6(2): 73-87.
[2] BANK L C. Composites for construction: Structural design with FRP materials[M]. John Wiley & Sons, 2006.
[3] TENG J G, SMITH S T, YAO J, et al. Intermediate crack-induced debonding in RC beams and slabs[J]. Construction and Building Materials, 2003, 17(6-7): 447-462.
[4] MOHAMMADI T, WAN B, HARRIES K A, et al. Bond behavior of FRP-concrete in presence of intermediate crack debonding failure[J]. Journal of Composites for Construction, 2017, 21(5): 04017018.
[5] ROSENBOOM O, RIZKALLA S H. Experimental study of intermediate crack debonding in fiber-reinforced polymer strengthened beams[J]. ACI Structural Journal, 2008, 105(1): 41-50.
[6] WU Y F, HUANG Y. Hybrid bonding of FRP to reinforced concrete structures[J]. Journal of Composites for Construction, 2008, 12(3): 266-273.
[7] WU Z M, HU C H, WU Y F, et al. Application of improved hybrid bonded FRP technique to FRP debonding prevention[J]. Construction and Building Materials, 2011, 25(6): 2898-2905.
[8] ZHOU Y, GOU M, ZHANG F, et al. Reinforced concrete beams strengthened with carbon fiber reinforced polymer by friction hybrid bond technique: Experimental investigation[J]. Materials & Design, 2013, 50: 130-139.
[9] CHEN C, WANG X, SUI L, et al. Influence of FRP thickness and confining effect on flexural performance of HB-strengthened RC beams[J]. Composites Part B: Engineering, 2019, 161: 55-67.
[10] WU Y F, WANG Z, LIU K, et al. Numerical analyses of hybrid-bonded FRP strengthened concrete beams[J]. Computer-Aided Civil and Infrastructure Engineering, 2009, 24(5): 371-384.
[11] 高磊. 混合粘贴FRP加固钢筋混凝土梁的界面黏结特性和抗弯性能[D]. 济南: 山东大学, 2020.
[12] ZHANG F, GAO L, WU Y F, et al. Flexural design of reinforced concrete structures strengthened with hybrid bonded FRP[J]. Composite Structures, 2021, 269: 113996.
[13] WU Y F, YAN J H, ZHOU Y W, et al. Ultimate strength of reinforced concrete beams retrofitted with hybrid bonded fiber-reinforced polymer[J]. ACI Structural Journal, 2010, 107(4): 451-460.
[14] GUAN Y, JIANG B, SONG X. Experimental study and numerical simulation on bonding behavior of the new HB-FRP strengthening technology[J]. Journal of Performance of Constructed Facilities, 2012, 26(2): 220-227.
[15] POPOVICS S. A numerical approach to the complete stress-strain curve of concrete[J]. Cement and Concrete Research, 1973, 3(5): 583-599.
[16] HORDIJK D A. Local approach to fatigue of concrete[D]. Delft University of Technology, 1991.
[17] HILLERBORG A, MODÉER M, PETERSSON P E. Analysis of crack formation and crack growth in concrete by means of fracture mechanics and finite elements[J]. Cement and Concrete Research, 1976, 6(6): 773-781.
[18] LIN J P, WU Y F. Numerical analysis of interfacial bond behavior of externally bonded FRP-to-concrete joints[J]. Journal of Composites for Construction, 2016, 20(5): 04016028.
[19] CEB-FIP model code 1990[M]. Thomas Telford Publishing, 1993.
[20] LUBLINER J, OLIVER J, OLLER S, et al. A plastic-damage model for concrete[J]. International Journal of Solids and Structures, 1989, 25(3): 299-326.
[21] WU Y F, YUN Y, WEI Y, et al. Effect of predamage on the stress-strain relationship of confined concrete under monotonic loading[J]. Journal of Structural Engineering, 2014, 140(12): 04014093.
[22] CHEN G M, TENG J G, CHEN J F. Finite-element modeling of intermediate crack debonding in FRP-plated RC beams[J]. Journal of Composites for Construction, 2011, 15(3): 339-353.
[23] GAO X, GAO L, ZHANG F. A new bond-slip model of hybrid bonded FRP-to-concrete Joints[J]. KSCE Journal of Civil Engineering, 2023, 27: 270-284.