Novel bond-slip model between concrete and angular CFRP fan type anchoraged CFRP strip

Ghoroubı, Rahim; Mercimek, Ömer; Sakin, Shaimaa

doi:10.1080/19648189.2021.1899990

Cited by 9 publications

(3 citation statements)

References 43 publications

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“…A limited number of studies 1,11,31,32,[38][39][40][41][42] have proposed interface models which include the effect of anchors on the shear stress-shear displacement behavior. Merto glu et al 31 proposed a shear stress-shear displacement interface material model for anchored CFRP-to-concrete joints.…”

Section: Anchored Bond-slip Modelsmentioning

confidence: 99%

A machine‐learning‐based constitutive bond‐slip model for anchored CFRP strips externally bonded on concrete members

Kurtoğlu

Anıl

Çevik

2022

Structural Concrete

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Strengthening is often required for reinforced concrete, steel, and masonry structures or structural elements when they possess insufficient performance against external loads such as earthquakes. Recently, the use of carbon fiber-reinforced polymers (CFRP) has been considered a viable strengthening technique alternative to traditional methods. The major concern is premature debonding failure hindering the efficient use of CFRP systems. FRP anchor systems have been used to avoid this phenomenon. This paper employs a machine learning (ML)-based algorithm (support vector regression) to propose predictive models to simulate the bond-slip behavior of anchored CFRP strips externally bonded to the concrete surface. A comprehensive database was constructed using the previous reports on the bond-slip behavior of FRP-to-concrete joints anchored with CFRP strips. Afterwards, the collected database was used to train and validate the proposed models. The input parameters cover all possible factors, that is, compressive strength of concrete, width of concrete block, anchor hole diameter, anchor hole depth, number of anchors at one row, number of anchors at one column; elastic modulus, width, bonding length, and thickness of CFRP strip. The output parameters are maximum shear capacity, residual shear capacity, displacement values at peak shear, and residual shear. Results imply that the proposed models have high prediction accuracies with low error rates. Proposed models are also presented in code format to be easily incorporated into analysis software for practical use.

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Section: Anchored Bond-slip Modelsmentioning

confidence: 99%

A machine‐learning‐based constitutive bond‐slip model for anchored CFRP strips externally bonded on concrete members

Kurtoğlu

Anıl

Çevik

2022

Structural Concrete

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“…FRP material is bonded to surfaces with an organic epoxy material. However, negative effects such as low resistance to fire, inability to be applied on wet or moist surfaces, inability to replace the coating layer and high cost of FRP strengthening techniques were seen in the literature review [17][18][19][20][21][22][23][24]. Considering these disadvantages of FRP, the widespread use of textile-reinforced mortar (TRM), depending on the scientific research on it, has been accepted as remarkable progress in the field of structural strengthening [19][20][21]25].…”

Section: Introductionmentioning

confidence: 99%

Textile Types, Number of Layers and Wrapping Types Effect on Shear Strengthening of Reinforced Concrete Beams with Textile-Reinforced Mortar versus Carbon-Fiber-Reinforced Polymer

Yılmaz

2023

Buildings

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In the scope of this study, the strengthening of reinforced concrete beams against to shear with different types of composite materials was investigated experimentally. A total of seventeen reinforced concrete beams, one with high shear strength and sixteen with low shear strength, were fabricated. The beam with high shear strength and one of the beams with low shear strength were chosen as reference beams. The remaining fifteen beam specimens were strengthened with textile-reinforced mortar (TRM) and carbon-fiber-reinforced polymer (CFRP). While light and heavy carbon mesh were used for strengthening with TRM, unidirectional carbon textile was used for strengthening with CFRP. Other experimental parameters were the spacing of strips, the number of layers (one or two) and the way of wrapping (strip or full). Simply supported beam specimens were tested under three-point loading. Beam specimens were compared in terms of failure mode, ultimate load capacity, ductility index and energy dissipation capacity.

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“…Zaki et al conducted loading experiments on three full-size T-beams reinforced with CFRP plates to analyze the anchoring performance of CFRP bolts and verified that the CFRP bolts effectively solved the problem of premature stripping failures of concrete beams [6]. Through loading experiments on 28 CFRP strips with different angles, Ghoroub et al proposed an equation for the ultimate bearing capacity of these strips according to the test results and established relevant models [7]. Haddad et al used CFRP cables of different sections to strengthen concrete slabs and concluded that CFRP cables with a 20 • dip angle had the best strength improvement effect [8].…”

Section: Introductionmentioning

confidence: 99%

Energy Action Mechanism of Reinforced Sandstone under Triaxial Cyclic Loading and Unloading

Shu-guang

Yang

et al. 2022

Materials

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In underground engineering, reinforcement is a necessary means to ensure the stability of surrounding rock. Due to the stress redistribution caused by excavation disturbances, the reinforced rock mass is frequently subjected to loading and unloading, and its mechanical properties change accordingly. Based on the above engineering practice, using pasted circular CFRP, an approximate simulation of the rock reinforcement effect of bolt and shotcrete support was performed. Triaxial cyclic loading and unloading tests of reinforced sandstone were carried out, and the influence of different reinforcement schemes on the mechanical properties was compared and analyzed. Furthermore, the strengthening mechanism, damage evolution, and energy transformation mechanism of CFRP are discussed. The results showed that the peak strength increased about 14.2% and 23.8% with the two reinforced schemes, and the residual strength increased about 27.3% and 52.8% with the increase in the area reinforced by CFRP. Under the same confining pressure and strain conditions, the characteristic energy density and elastic energy ratio increased with an increase in the reinforcement area, but the damage variable decreased. It is proved that CFRP can improve energy absorption efficiency, enhance the energy storage limit, and reduce dissipation efficiency. By inhibiting the propagation of internal fissures and limiting the energy dissipation during fractures, the rock mass can be restrained and strengthened.

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Novel bond-slip model between concrete and angular CFRP fan type anchoraged CFRP strip

Cited by 9 publications

References 43 publications

A machine‐learning‐based constitutive bond‐slip model for anchored CFRP strips externally bonded on concrete members

A machine‐learning‐based constitutive bond‐slip model for anchored CFRP strips externally bonded on concrete members

Textile Types, Number of Layers and Wrapping Types Effect on Shear Strengthening of Reinforced Concrete Beams with Textile-Reinforced Mortar versus Carbon-Fiber-Reinforced Polymer

Energy Action Mechanism of Reinforced Sandstone under Triaxial Cyclic Loading and Unloading

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