Finite element modeling of debonding failures in FRP-strengthened RC beams: A dynamic approach

Chen, G.M.; Teng, Jinguang; Chen, J.F.; Xiao, Q. G.

doi:10.1016/j.compstruc.2015.05.023

Cited by 96 publications

(41 citation statements)

References 58 publications

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“…This feature could be illustrated by the fact that, in the simulations of FRP-concrete bonded joint with no or insufficient stiffness proportional damping, the difficulty of convergence is only encountered when a certain length of crack has been formed at the joint, but not in the initial stage due to the presence of inherent numerical damping in HHTmethod [24][25][26]. At the same time when FRP-concrete bonded joints deteriorated, the mass of the already debonded portion also becomes larger, as indicated in (14), a change that also makes the value of frequency smaller, thereby making the stiffness proportional damping ratio smaller in the process of damaging at the joint, as indicated in (13).…”

Section: Discussionmentioning

confidence: 99%

“…It is found that the mass proportional damping coefficient has no effect on the stress-displacement curve, leading to the stress-displacement curve of the case with zero damping being exactly the same as that of the other cases. This element's tests indicate that there is no need to use mass proportional damping for improvement of convergence, due to unnoticeable oscillation in simulations under Mode I loading and the inherent presence of numerical damping in HHT-method [24][25][26]. Also, no negative effect is found on the simulation results.…”

Section: Element Tests Under Mode I Loadingmentioning

confidence: 99%

“…[24] investigated the effect of Rayleigh damping on the numerical results of FRP-plated RC beams. They found that only the stiffness proportional damping coefficient that is related to the stiffness matrix is essential to damping out highfrequency oscillations, and the low-frequency oscillation is damped out automatically in an implicit dynamic approach, HHT-approach, which they used in their study [24,25]. However, this may not be the case for simulating debonding behavior of FRP-concrete bonded joint under Mode II loading.…”

Section: Introductionmentioning

confidence: 99%

“…It is for this reason that a dynamic approach proves to be more robust than conventional Newton-Raphson and arc-length techniques in overcoming the convergence difficulty arising from concrete cracking [24]. As a result, the implicit dynamic approach [24] is adopted herein to simulate the debonding behavior of FRP-concrete bonded joint under Mode II loads.…”

Section: Dynamic Approachmentioning

confidence: 99%

See 3 more Smart Citations

Mesoscale Modelling of Bond Behavior at FRP-Concrete under Mode II Loading: Effect of Rayleigh Damping

Xiao

et al. 2017

International Journal of Polymer Science

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The paper mainly focuses on the study of the effects of Rayleigh damping in the simulations of FRP-concrete bonded joints, thereby proposing an approach to determine the value of its appropriate Rayleigh damping. Specifically, the element tests under Mode I and Mode II fracture modes were first carried out to investigate the effects of the mass proportional Rayleigh damping and the stiffness proportional Rayleigh damping. An FRP-concrete bonded joint is then employed to further investigate the effects of Rayleigh damping on the simulation results under Mode II fracture mode. It is shown that low-frequency vibrations are produced in the simulations of the specimens loaded by Mode I loading and could be damped by the mass proportional Rayleigh damping, while high-frequency vibrations are produced in the simulations of the specimens loaded by Mode II loading and could only be damped by the stiffness proportional Rayleigh damping. It also shows that the stiffness proportional damping is essential to damp out the oscillations in such simulations, thereby improving the convergence. In addition, the procedure proposed in this paper can lead to a proper interval for the value of the stiffness proportional Rayleigh damping, beyond which an unreasonable simulation result may be obtained.

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Section: Discussionmentioning

confidence: 99%

Section: Element Tests Under Mode I Loadingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Dynamic Approachmentioning

confidence: 99%

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Mesoscale Modelling of Bond Behavior at FRP-Concrete under Mode II Loading: Effect of Rayleigh Damping

Xiao

et al. 2017

International Journal of Polymer Science

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“…The consideration of the inertial terms in the FE formulation allowed to detect the spectral response of the structure and to quantify the impact of cracking and IC debonding on the response in the frequency domain. Chen et al (2015) used a dynamic 2D FE model to study the response of an FRP strengthened reinforced concrete beam. The FRP layer was modeled using truss elements whereas the adhesive layer and its two physical interfaces were modeled using an aggregated bond-slip relation that was implemented in an interfacial element.…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical study of the dynamic debonding in FRP plated beams

Mulian

Rabinovitch

2016

International Journal of Solids and Structures

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a b s t r a c tThis paper presents an experimental study of the dynamic debonding failure mechanism in FRP plated beams. The experimental study is accompanied by an analytical/numerical study. The focus in the experimental investigation is on the dynamic aspects of the brittle, rapid, and abrupt failure mechanism and on its characterization and quantification. The experimental technique is based on four point bending tests of FRP plated steel beam specimens. The main dynamic monitoring technique uses high-speed digital photography with rate of 88,050 frames per second. The analytical and numerical aspects of the investigation use an extended high order layered beam theory with a physical modeling resolution that considers nucleation and evolution of the debonding mechanism in each physical interface. This is achieved by using cohesive interfaces and a specially tailored finite element formulation that is based on the theory. Digital image processing of the experimental results reveals and quantifies the dynamics of the interfacial failure with propagation velocities in the order of 100-1000 m/s and duration of less than 0.2 ms. The results reveal the dynamic nature of the failure process and provide an experimental benchmark for its consideration. They also provide direct experimental data for supporting and validating the theory and for determining the fracture energy and length scale parameters of the cohesive interfaces. With that, the combined experimental and theoretical study further explores the dynamic features of the failure mechanism.

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Numerical study of structural behavior of fiber‐reinforced polymer‐strengthened reinforced concrete beams with bond‐slip effect under cyclic loading

Pathak

Zhang

2018

Structural Concrete

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Two simple finite element models denoted as FEM-B and FEM-BC are developed in this paper to investigate the structural behavior of fiber-reinforced polymer (FRP) strengthened reinforced concrete (RC) beams under static and cyclic loading. First, the FEM-B is developed for analysis of FRP-strengthened RC beams under static loading and the bond-slip effect between FRP, adhesive and concrete is included. Then FEM-BC is developed based on FEM-B for analysis of structural behavior of FRP-strengthened RC beams under cyclic loading, and degradations of material properties of concrete, steel reinforcement, and FRP due to cyclic loading are taken into account. The developed FEMs are validated against experimental results and demonstrated to be effective for structural analysis of FRP-strengthened RC beams. Furthermore, parametric studies are carried out to learn the effects of types, thickness, and length of FRP on the structural behavior of FRP-strengthened RC beams based on the FEM-BC model. The research findings are summarized finally.bond-slip, cyclic loading, fiber reinforced polymer (FRP), finite element analysis, RC beams | INTRODUCTIONStructural retrofitting and rehabilitation of existing reinforced concretes (RC) such as bridges have become vital aspects of construction in many countries in recent decades. For example with the expansion of highway systems, there is an increased need to provide corrosion-free RC components for highway bridges. 1 Steel-rebar RC structures are often subjected to structural deterioration, which might be caused by design and construction defects, environmental effects, and extreme loadings such as earthquake, fire, impact and cyclic loadings. In particular, cyclic load, which is often applied to RC structures such as bridge during their service life, causes degradation of materials, consequently reducing the expected life and performance. Due to the superior characteristics of fiber-reinforced polymers (FRPs), such as high strength to weight ratio, ease of application, immunity to corrosion, fatigue resistance, and good durability, they are being used increasingly to strengthen RC structures. 2 FRP has been used to strengthen RC beam, which is one of the most fundamental structural elements as well as an indispensable part for most civil constructions including bridges. Experimental study of RC beams strengthened with FRP composites demonstrated the feasibility and efficiency of FRP strengthening systems in improving flexural stiffness and strength. 3 FRP plates or sheets are usually glued to the bottom or tension side of a RC beam to increase the flexural strength or applied on sides of a RC beams to increase the Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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Finite element modeling of debonding failures in FRP-strengthened RC beams: A dynamic approach

Cited by 96 publications

References 58 publications

Mesoscale Modelling of Bond Behavior at FRP-Concrete under Mode II Loading: Effect of Rayleigh Damping

Mesoscale Modelling of Bond Behavior at FRP-Concrete under Mode II Loading: Effect of Rayleigh Damping

Experimental and analytical study of the dynamic debonding in FRP plated beams

Numerical study of structural behavior of fiber‐reinforced polymer‐strengthened reinforced concrete beams with bond‐slip effect under cyclic loading

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