Bilinear load-deflection model of fiber-reinforced polymer–concrete composite beam with interface slip

Wang, Jingquan; Zou, Xingxing; Feng, Yu

doi:10.1177/1687814015590312

Cited by 10 publications

(5 citation statements)

References 26 publications

(57 reference statements)

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“…The research of Yuan et al (Yuan and Hadi, 2017) showed that with the ignorance of the bond-slip of composite beams, the stiffness and ultimate load of the structure will be overestimated. Wang (Wang et al, 2015) highlights the debonding mechanism of the GFRP concrete composite beams theoretically, which is verified by the tests. Furthermore, Umberto (Umberto et al, 2021) used the cohesive model to simulate the bond-slip of FRP-strengthened concrete beams, and the results were in good agreement with the experimental results.…”

Section: Introductionmentioning

confidence: 63%

Numerical Analysis of Structural Performance of Concrete-GFRP Composite I-Beam

et al. 2022

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The concrete-GFRP composite beams have received extensive attention in civil engineering. However, the ambiguity of the fracture, debonding of the interface, and the GFRP profile limit the precise design of the composite beam. This article presents a comprehensive numerical study for the structural performance of composite pultruded GFRP beams to provide a better understanding of the mechanism of interfacial debonding and GFRP matrix fracture. The failure and delamination process of pultruded GFRP for anisotropy of materials is modeled using the Hashin criteria. The bond–slip behavior between the concrete slab and the top flange of the GFRP I-beam is simulated by the bilinear cohesive interface element. The availability and accuracy of the finite element model are verified by comparison with the four-point bending test results of the pure GFRP I-beam and composite beams as well. Based on the proposed comprehensive finite element model, the effects of the strength, thickness, and width of the concrete slab and the shear-span ratio of the beam on the structural behavior of the composite beam are studied. According to the parametric analysis, the excessive high strength of concrete, the width, and/or thickness of the concrete slab would lead to shear failure of the slab rather than significantly increasing the ultimate load of the composite beam. When having a small shear-span ratio, the matrix fracture and delamination will occur in the web of the GFRP profile. In addition, the height of the I-profile web has a significant effect on the stress and strain distribution of the composite beam. These parametric analyses could provide the numerical basis for the design of the GFRP composite beams.

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Section: Introductionmentioning

confidence: 63%

Numerical Analysis of Structural Performance of Concrete-GFRP Composite I-Beam

et al. 2022

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“…4. An equation for deflection of a beam can be found by direct integration of curvature using Euler-Bernoulli beam theory (Garcez & Silva Filho, 2009;Wang, 2015). The bi-linearity of the (4) δ max,el = ϕ 24 3L 2 − 4a 2 , moment-curvature relation of strain-hardening fiber reinforced cementitious material beam under monotonic loading was verified by Soranakom and Mobasher (2007).…”

Section: Analytical Calculation Of Deflectionmentioning

confidence: 92%

“…Closed-form analytical solutions for calculating deflection of beams and slabs under various loadings and assuming bi-linear moment-curvature relationship of cross-section were developed in Wang (2015). By means of a parametrized constitutive law of UHPFRC (Soranakom & Mobasher, 2007), bending moment-deflection curves were calculated, reflecting well the structural response of a beam.…”

Section: Literature Review On Modelling Of Uhpfrcmentioning

confidence: 99%

Experimental and Analytical Investigation of Deflection of R-UHPFRC Beams Subjected to Loading–Unloading

Sawicki,

Brühwiler

2024

Int J Concr Struct Mater

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Under service conditions, R-UHPFRC (Reinforced Ultra High Performance Fiber Reinforced Cementitious composite) beams exhibit residual deflection after loading–unloading. This is due to the tensile strain hardening behavior of UHPFRC. The precise calculation of deflection is thus relevant and was not addressed previously. This paper proposes a material model for UHPFRC under loading–unloading and a numerical layered model for the calculation of stress and strain distribution in the cross section. Then, a curvature-based analytical model is presented for calculation of deflection of a beam. This method is finally compared and validated against experimental results as obtained from four-point bending of full-scale R-UHPFRC beams. This research reveals the need for a specific material model for UHPFRC subjected to loading–unloading for the precise calculation of the structural response of elements and members under repetitive loading, such as service or fatigue loading.

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“…4,13 The subsequent peeling of the FRP degrades the load-bearing capacity of the member, which then fails to reach its expected design value. 14 Therefore, effective monitoring and inspection of the interfacial bond between concrete and FRP is a prerequisite for ensuring the desired strengthening effect.…”

Section: Introductionmentioning

confidence: 99%

A CNN-integrated percussion method for detection of FRP–concrete interfacial damage with FEM reconstruction

Kong

et al. 2022

Structural Health Monitoring

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Reinforced concrete (RC) structures are commonly strengthened using externally bonded fiber-reinforced polymer (FRP) sheets. The bond between the FRP and concrete is a crucial factor affecting the strengthening effect, and debonding along the FRP–concrete interface is usually accompanied by the fracture of the underlying concrete. Therefore, it is necessary to identify the interface damage of FRP-to-concrete joints and conduct mechanical analysis. However, debonding is invisible damage that occurs inside the underlying FRP layer, which makes damage detection more difficult. To this end, this study fuses a percussion method with a deep learning framework to address the detection of such invisible lesions. Meanwhile, the visualization study provides guidance for later maintenance work. To further illustrate the hazard of the identified lesions, three-dimensional reconstruction for finite element modeling (FEM) with detected damage information based on percussion is proposed to elucidate the mechanical degradation caused by the fracture of underlying concrete. Lastly, the results of this study demonstrate that the detection, visualization, and FEM reconstruction of FRP–concrete interface damage using percussion signals has considerable application potential and is worthy of further study.

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Bilinear load-deflection model of fiber-reinforced polymer–concrete composite beam with interface slip

Cited by 10 publications

References 26 publications

Numerical Analysis of Structural Performance of Concrete-GFRP Composite I-Beam

Numerical Analysis of Structural Performance of Concrete-GFRP Composite I-Beam

Experimental and Analytical Investigation of Deflection of R-UHPFRC Beams Subjected to Loading–Unloading

A CNN-integrated percussion method for detection of FRP–concrete interfacial damage with FEM reconstruction

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