Structural behavior of CFRP-strengthened steel beams at different service temperatures: Experimental study and FE modeling

Dong, Guangneng; Wang, Huaping; Liu, Yunling; Gao, Wan-Yang; Dai, Jian‐Guo

doi:10.1016/j.engstruct.2023.116646

Cited by 9 publications

(2 citation statements)

References 57 publications

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“…Furthermore, various bond-slip models have been developed based on experimental results from bonded joint tests to describe the local bond-slip characteristics at the inerface between FRP and concrete (e.g., Dai et al, 2005;Lu et al, 2005a). However, when assessing the influence of elevated temperatures, numerous studies have investigated the bond behavior and the mechanisms leading to debonding in FRP-strengthened RC or steel beams subjected to combined mechanical and thermal loadings (Guo et al, 2022a(Guo et al, , 2022b(Guo et al, , 2023a(Guo et al, , 2023bBiscaia et al, 2023;Dong and Hu, 2016;Gao et al, 2012Gao et al, , 2015Jia et al, 2021;Zhou et al, 2022). Temperature-dependent bond-slip models for the FRP-to-concrete interface at elevated temperatures have also been developed (Dai et al, 2013;Dong et al, 2022;Guo et al, 2023c).…”

Section: Introductionmentioning

confidence: 99%

Nonlinear bond-slip model for fiber-reinforced polymer laminates externally bonded to thermally damaged concrete

Lv,

Xie,

Gao

2024

Advances in Structural Engineering

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This paper presents a novel nonlinear local bond-slip model for fiber-reinforced polymer (FRP) laminates externally bonded to thermally damaged concrete substrates. The proposed model is an extension of an existing two-parameter bond-slip model and incorporates two key parameters including interfacial fracture energy ([Formula: see text]) and interfacial brittleness index ([Formula: see text]). To study the variations of [Formula: see text] and [Formula: see text] with different thermal damage levels of the concrete substrate, an extensive experimental database of shear tests on FRP-to-thermally damaged concrete bonded joints was collected from the existing literature. The [Formula: see text] values were calculated from the peak pull loads with proper consideration of the bond length and width effects, while the [Formula: see text] values were obtained by least-squares regression analysis using experimental load-displacement curves or measured strain distributions in the FRP laminates. The results have indicated that the [Formula: see text] values initially exhibit a slight increase accompanied by mild thermal damage of the concrete substrate after exposure to moderately high temperatures; however, these values significantly decrease when the exposure temperature exceeds 300°C. The [Formula: see text] values initially decrease with high-temperature exposure and stabilize at around 50% of the initial values when the temperatures reach around 400°C. Despite the inherent variability in the test database, the proposed temperature-dependent bond-slip model has demonstrated its accuracy, as demonstrated by the comparisons between the theoretical predictions generated by the model and the corresponding shear test results. This interfacial bond-slip model is expected to serve as a constitutive law to characterize the bond behavior between externally bonded FRP laminates and thermally damaged concrete substrate, thus facilitating the practical application of high-performance FRP composites in the repair and strengthening of thermally or fire-damaged RC members.

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Section: Introductionmentioning

confidence: 99%

Nonlinear bond-slip model for fiber-reinforced polymer laminates externally bonded to thermally damaged concrete

Lv,

Xie,

Gao

2024

Advances in Structural Engineering

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“…[37][38][39][40][41][42] The above merits make FRU composites a form of advanced construction material being used widely for strengthening existing deteriorated structures or building novel structures. [43][44][45][46][47] Preliminary test results on FRU structural elements have brought faith to researchers that FRU is of excellence in mechanical properties and suitable for marine and offshore construction. 27 The authors' group has tested FRU elements including plates, tubular beams and tubular columns under various loading conditions, and all of these studies have demonstrated excellent mechanical properties of FRU elements.…”

Section: Introductionmentioning

confidence: 99%

Offshore floating wind turbine foundation revolution enabled by fiber-reinforced polymer (FRP) reinforced cementitious materials

Fan,

Zeng,

et al. 2024

TIMS

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<p>Offshore floating wind turbines (OFWTs) are gaining popularity due to their superior wind energy capture and minimal visual impact. However, traditional steel support foundations for OFWTs are plagued by corrosion issues. This article proposes the use of Fiber-Reinforced Polymer (FRP) reinforced Ultra-High Performance Concrete (UHPC) composites, referred to as FRU composites, for OFWT foundations. Durability assessment of FRU plates under simulated marine environment is conducted based on accelerated aging tests on FRU plates. Scanning electron microscope (SEM) analyses are conducted to explore the fracture surface and interface between FRP and UHPC matrix. A series of tests are conducted and the test results of the FRU elements are summarized in this article. Strength design methodologies for FRU elements under various loadings are established based on summary of existing studies. Hydrodynamic analyses and comparative studies between FRU and steel OFWTs reveal that FRU OFWTs demonstrate improved stability and reduced motion responses under combined wind-wave-current loading conditions. The successful development of FRU composites is anticipated to revolutionize the OFWT industry by offering durable and cost-effective foundation options.</p>

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Effects of temperature and low strain rate on tensile performance of aramid fiber bundle

Wang,

Gao,

Zhou

et al. 2024

Polymer Composites

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In this research, the effects of ultimate strain rate and environmental temperature on the mechanical performance of the aramid fiber bundles were experimentally investigated. The scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR) were used to detect the tensile failure mechanism of the aramid fiber bundle. The results indicated that the tensile strength, failure strain, elastic modulus, and toughness of the aramid fiber bundle were sensitive to the strain rate, which was represented as the typical bilinear monotonic relationships. In contrast, the impact of environmental temperature on the four parameters of aramid fiber bundle was more complex. The ultimate strength, failure strain and toughness of aramid fiber bundle increased with the temperature changing from −60 to 30°C, but rapidly decreased from 30 to 90°C. Finally, the dispersion of the mechanical performance was quantitatively analyzed based on the scale and shape parameters obtained from Weibull model.Highlights Tensile tests for aramid fiber bundle under different strain rates and temperatures were conducted. Strain rate and temperature effects on tensile properties of fiber bundle were quantified. Tensile failure mechanism of fiber bundle was analyzed. Dispersion of the mechanical performance was quantitatively analyzed.

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Structural behavior of CFRP-strengthened steel beams at different service temperatures: Experimental study and FE modeling

Cited by 9 publications

References 57 publications

Nonlinear bond-slip model for fiber-reinforced polymer laminates externally bonded to thermally damaged concrete

Nonlinear bond-slip model for fiber-reinforced polymer laminates externally bonded to thermally damaged concrete

Offshore floating wind turbine foundation revolution enabled by fiber-reinforced polymer (FRP) reinforced cementitious materials

Effects of temperature and low strain rate on tensile performance of aramid fiber bundle

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