Numerical Analyses of Hybrid‐Bonded FRP Strengthened Concrete Beams

Wu, Yu-Fei; Wang, Zhen Yu; Kang, Longyun; He, Wei

doi:10.1111/j.1467-8667.2009.00596.x

Cited by 68 publications

(16 citation statements)

References 22 publications

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“…The damaged plasticity model is adopted to model the material behavior of concrete. The ascending section of the tensile relationship is assumed to be linear, and the softening is assumed to be exponential, as shown in Figure 1 a, where f t refers to the tensile strength;

indicates the strain at peak stress; G f is the fracture energy of concrete; and h b is the crack band width and was taken to be

, where A is the total area of the element [ 39 ]. The fracture energy method is adopted for the post-peak cracking of concrete.…”

Section: Finite Element Modelling and Implementationmentioning

confidence: 99%

Numerical Sensing of Plastic Hinge Regions in Concrete Beams with Hybrid (FRP and Steel) Bars

Yuan

Chen

2018

Sensors

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Fibre-reinforced polymer (FRP)-reinforced concrete members exhibit low ductility due to the linear-elastic behaviour of FRP materials. Concrete members reinforced by hybrid FRP–steel bars can improve strength and ductility simultaneously. In this study, the plastic hinge problem of hybrid FRP–steel reinforced concrete beams was numerically assessed through finite element analysis (FEA). Firstly, a finite element model was proposed to validate the numerical method by comparing the simulation results with the test results. Then, three plastic hinge regions—the rebar yielding zone, concrete crushing zone, and curvature localisation zone—of the hybrid reinforced concrete beams were analysed in detail. Finally, the effects of the main parameters, including the beam aspect ratio, concrete grade, steel yield strength, steel reinforcement ratio, steel hardening modulus, and FRP elastic modulus on the lengths of the three plastic zones, were systematically evaluated through parametric studies. It is determined that the hybrid reinforcement ratio exerts a significant effect on the plastic hinge lengths. The larger the hybrid reinforcement ratio, the larger is the extent of the rebar yielding zone and curvature localisation zone. It is also determined that the beam aspect ratio, concrete compressive strength, and steel hardening ratio exert significant positive effects on the length of the rebar yielding zone.

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indicates the strain at peak stress; G f is the fracture energy of concrete; and h b is the crack band width and was taken to be

, where A is the total area of the element [ 39 ]. The fracture energy method is adopted for the post-peak cracking of concrete.…”

Section: Finite Element Modelling and Implementationmentioning

confidence: 99%

Numerical Sensing of Plastic Hinge Regions in Concrete Beams with Hybrid (FRP and Steel) Bars

Yuan

Chen

2018

Sensors

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“…With the additional slip and load, maximum shear stress of interface is obtained at the loaded end and the ultimate bond capacity is reached. According to this mechanism, many investigations are conducted and several bond‐slip laws are proposed in the literature such as bi‐ or trilinear , quadratic , and shear exponential models . But, most of these studies show that shear exponential model is more realistic when comparing with their identical experimental works .…”

Section: Local Bond Stress–slip Relationship For Frp To Concrete Intementioning

confidence: 99%

“…A study by Lu et al pulled out experimental test results and proposed three new bond‐slip models for CFRP–concrete interface. Lu et al, Wu et al, Chen, and Pan derived indirect analytical solutions using numerical simulations. Existing linear and bilinear models are evaluated with finite element (FE) simulations and results are compared with experimental tests.…”

Section: Introductionmentioning

confidence: 99%

A modified fiber-reinforced plastics concrete interface bond-slip law for shear-strengthened RC elements under cyclic loading

Selman

Alver

2015

Polym. Compos.

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The objective of this article is to realistically analyze fiber-reinforced plastics (FRP) retrofitted reinforced concrete structures under cyclic loading taking into account FRP–concrete bond-slip law with cyclic bond degradation. In literature, even though numerous studies have been conducted in FRP–concrete interface bond-slip modeling under cyclic loads, a small number of them consider the influence of cyclic degradation on FRP–concrete interface bond behavior. Within this framework, the bond-slip law for carbon fiber-reinforced plastics–concrete interface is revised by utilizing Harajli's and Ko-Sato's approaches. The procedure is distinct from others because it develops existing deficiencies of these approaches, whereas a more reliable modeling process is proposed for use in practice. Conventional bond-slip law of Lu et al. is compared with this interface relationship stated in this investigation and the difference is clearly shown in terms of structural parameters. Experimental tests are conducted at the same time for verification. It is proved that cyclic bond degradation affects the interface behavior; thus, the structural response cannot be omitted in structural evaluations. Structural performance measures are obtained in good agreement for each level of cycles. The technique proposed clearly exhibits structural response difference between monotonic and cyclic loadings while good agreement is reached with experimental results. POLYM. COMPOS., 37:3373–3383, 2016. © 2015 Society of Plastics Engineers.Scientific and Technological Research Council of Turkey (111M559

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“…The computer‐aided analysis as well as computer‐aided design of components is an indispensable help in daily engineering work. For computer‐aided design of a strengthening with EBR analytic models as presented in the previous or numerical models, in Wu et al (2009), can be used.…”

Section: Design Approachmentioning

confidence: 99%

Strengthening and Rehabilitation of Reinforced Concrete Slabs with Carbon‐Fiber Reinforced Polymers Using a Refined Bond Model

Finckh

Zilch

2012

Computer aided Civil Eng

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Slabs are one of the main load-bearing elements in nearly every structure. Because of additional live loads or modifications of the building structure these slabs often have to be strengthened. Using externally bonded carbon-fiber reinforced polymer (CFRP) strips to strengthen existing concrete structures has become common practice. One of the main failure modes is the loss of the composite action between the concrete and the CFRP strip making the bond force transfer very important. This bond force transfer depends on many parameters including the concrete strength, the ratio between shear force, and bending moment. A new parameter recently discovered by the Technische Universität München (TUM) is the deflection of the structural elements themselves. Because of this deflection self-inducted contact pressure occurs. This contact pressure affects a higher bond transfer. The lower effective depth of slabs compared to beams causes higher deflections.In this article, first a few principles on the strengthening with adhesive-bonded CFRP strips and the characteristics of the bond are explained. Then, the basics of the bond force transfer, at the end anchorage and in the rest of the element, are summarized. Based on these essentials, as well as numerous experiments, the change in the bond force transfer at the structural element caused by the curvature is then derived. With these findings, a complete verification concept is presented, which is ideal for computerized calculations. This verification concept is finally compared to several full-scale test results presented in pertinent literature.

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Numerical Analyses of Hybrid‐Bonded FRP Strengthened Concrete Beams

Cited by 68 publications

References 22 publications

Numerical Sensing of Plastic Hinge Regions in Concrete Beams with Hybrid (FRP and Steel) Bars

Numerical Sensing of Plastic Hinge Regions in Concrete Beams with Hybrid (FRP and Steel) Bars

A modified fiber-reinforced plastics concrete interface bond-slip law for shear-strengthened RC elements under cyclic loading

Strengthening and Rehabilitation of Reinforced Concrete Slabs with Carbon‐Fiber Reinforced Polymers Using a Refined Bond Model

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