Bond performance of CFRP bars embedded in UHPFRC incorporating orientation and content of steel fibers

Liu, Ke; Liang, Longming; Zheng, Feng; Li, Chuanxi; Zhou, Jiale; Li, Youlin

doi:10.1016/j.jobe.2023.106827

Cited by 6 publications

(3 citation statements)

References 43 publications

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“…The increase in RH and SSC strength increased the bond strength, which was attributable to the increase in mechanical interlocking force between the BFRP bar and the SSC. Regarding the RH, the increased slope caused by the increasing RH resulted in greater bond strength [48]. For the SSC, where bond failure mainly occurred, increasing SCC strength enhanced the bond strength.…”

Section: Bond Strength and Bond Slipmentioning

confidence: 94%

Bond Performance between Fiber-Wrapped Ribbed Basalt Fiber-Reinforced Polymer Bars and Seawater Sea-Sand Concrete

Lin,

Weng,

Xiao

et al. 2023

Buildings

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The high corrosion resistance of fiber-reinforced polymers (FRPs) and related concrete structures means that they are suitable for application in the marine environment. Therefore, the replacement of steel bars with fiber-reinforced polymer (FRP) bars enhances corrosion resistance in seawater sea-sand concrete (SSC) structures. Geometric parameters significantly influence the performance of the bond between ribbed FRP bars and SSC, thereby affecting the mechanical properties of the concrete structures. In this study, the performance of the bond between ribbed (i.e., with fiber wrapping) basalt-fiber-reinforced polymer (BFRP) bars and SSC was investigated through pull-out tests that considered rib geometry and SSC strength. The results demonstrated that an increase in rib and dent widths reduced the bond stiffness, while an increase in rib height and SSC strength gradually increased the bond stiffness and strength. Additionally, the bond stiffness and bond strength were relatively low because the surface fiber bundles buffered the mechanical interlocking force between the BFRP ribs and the concrete, resulting in plastic bond failure during the loading process. Furthermore, the adhesion of the fiber bundles to the surface of the BFRP bars also influenced bond performance, with higher adhesion leading to greater bond stiffness and strength.

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Section: Bond Strength and Bond Slipmentioning

confidence: 94%

Bond Performance between Fiber-Wrapped Ribbed Basalt Fiber-Reinforced Polymer Bars and Seawater Sea-Sand Concrete

Lin,

Weng,

Xiao

et al. 2023

Buildings

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“…6 Besides, CFRP strengthening has been widely studied in fatigue strengthening of steel structures because CFRP material has high tensile strength, fatigue resistance, corrosion resistance, and convenient processing. 7,8 CFRP arrangement is one of the crucial concerns for the fatigue behavior of CFRP-strengthened steel structures. According to the results of tests and models, Wu et al 9 discovered that the fatigue life of the double-sided CFRP strengthened steel structures might be improved 11.3 times that of the unstrengthened.…”

Section: Introductionmentioning

confidence: 99%

Fatigue performance of carbon fiber‐reinforced polymer strengthened single‐edge cracked steel plates: Effects of adhesive property and CFRP arrangement

Ke,

Chen,

Feng

et al. 2024

Polymer Composites

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Carbon fiber‐reinforced polymer (CFRP) is increasingly used to improve the fatigue behavior of damaged steel structures due to its advantages, including high strength and convenient processing. However, several issues, such as the effects of the adhesive property and CFRP arrangement, still need to be studied. In this study, a total of 20 single‐cracked steel specimens were tested under fatigue load, including two unstrengthened specimens, six single‐sided strengthened specimens, and 12 double‐sided strengthened specimens. The failure mode, fatigue life, crack propagation pattern, and interface damage development were obtained from experiments. The results show that epoxy resin structural adhesives (adhesives Araldite 420 and J133C) have the best bonding properties with CFRP. For the conventional epoxy adhesives, Araldite 420 and J133C can considerably improve fatigue life, which increased by more than 44.84 times to unstrengthened specimens. CFRP plate strengthening can significantly improve the fatigue life of single‐edge cracked steel plates. For the double‐sided strengthened specimens, the fatigue life can be improved by 6.93–44.84 times that of unstrengthened specimens. For the single‐sided, the fatigue life can be improved by 2.24–2.77 times. Properties of epoxy adhesive have a more significant effect on fatigue life compared to the thickness of the CFRP plate due to debonding.Highlights Ductile epoxy adhesives are most conducive to improving the fatigue behavior of CFRP strengthened steel plates. The fatigue life of steel plates can be improved by increasing the thickness of CFRP plates and using double‐sided CFRP strengthening. Interface debonding is the main failure mode of CFRP plates strengthening single‐edge cracked steel plates under fatigue.

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“…Compared with conventional concrete, UHPC, designed based on particle packing theory, has excellent durability and significant compressive strength (Zhou et al, 2022;Ke et al, 2023a;Zhou et al, 2023). And UHPC can be combined with carbon fiber-reinforced polymer for high load or corrosive environments (Ke et al, 2023b;Ke et al, 2023c).…”

Section: Introductionmentioning

confidence: 99%

Section optimization design of UHPC beam bridges based on improved particle swarm optimization

Li,

Liu

et al. 2023

Front. Mater.

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Ultra-high performance concrete has excellent mechanical properties such as ultra-high strength and high durability, and has a broad application prospect in the field of bridge engineering. To make full use of the superior mechanical properties of UHPC and reduce the cost of the bridge, the particle swarm optimization algorithm is used to optimize the structural design of the UHPC beam bridge; Aiming at the problem that the traditional particle swarm optimization algorithm is easy to fall into local optimum, the nonlinear adaptive weight update method is used to improve the particle swarm optimization algorithm. Based on the above-mentioned improved particle swarm optimization algorithm, the optimal design method of ordinary reinforced UHPC beams and prestressed UHPC beams with commonly used highway spans is studied. The reliability of the optimized structural limit state is analyzed by Monte Carlo (MC) importance sampling method. The results show that compared with the traditional particle swarm optimization algorithm, the improved particle swarm optimization algorithm has higher convergence speed and convergence accuracy. The optimal height-span ratio of ordinary reinforced UHPC beams decreases with the increase of the span, and the construction cost gradually increases; The optimal height-span ratio of the prestressed beam decreases first and then increases with the increase of the span, and the construction cost gradually increases. The calculation results of load capacity reliability indexes of optimization results are all higher than the target reliability indexes of similar components stipulated in China’s “Uniform Standard for Structural Reliability Design of Highway Engineering”.

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Bond performance of CFRP bars embedded in UHPFRC incorporating orientation and content of steel fibers

Cited by 6 publications

References 43 publications

Bond Performance between Fiber-Wrapped Ribbed Basalt Fiber-Reinforced Polymer Bars and Seawater Sea-Sand Concrete

Bond Performance between Fiber-Wrapped Ribbed Basalt Fiber-Reinforced Polymer Bars and Seawater Sea-Sand Concrete

Fatigue performance of carbon fiber‐reinforced polymer strengthened single‐edge cracked steel plates: Effects of adhesive property and CFRP arrangement

Section optimization design of UHPC beam bridges based on improved particle swarm optimization

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