Theoretical Solutions on Interfacial Stress Transfer of Externally Bonded Steel/Composite Laminates

Yuan, Hong; Wu, Zhishen; Yoshizawa, Hiroyuki

doi:10.2208/jscej.2001.675_27

Cited by 78 publications

(82 citation statements)

References 10 publications

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“…Based on energy method or force equilibrium method, Eq.14 was derived by many researchers (Täljsten et al 1997, Yuan et al 2001 and now is applied widely in predicting the ultimate bond forces of FRP sheet-concrete interfaces.…”

Section: Description Of the Methodologymentioning

confidence: 99%

“…Based on different types of interfacial bond stress-slip relationships, Yuan et al (2001) proved that the maximum interfacial bond force can be expressed as a function of the G f and FRP stiffness (elastic modulus×thickness). Due to the clear physical meaning of the G f , it is very useful to apply it in numerical analysis for deriving bond strength and anchorage length models as well as for clarifying the debonding failure mechanisms of FRP sheet-concrete interfaces in more comprehensive ways Wu 1999, Wu andYin 2002).…”

Section: Literature Reviewmentioning

confidence: 99%

“…Yuan et al (2001) gave a theoretical expression for the effective bond length (defined as the bond length undertaking the 97% of whole interfacial load) based on the assumed interfacial fracture energy and interfacial bilinear τ~s relationship.…”

Section: )mentioning

confidence: 99%

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Development of the Nonlinear Bond Stress–Slip Model of Fiber Reinforced Plastics Sheet–Concrete Interfaces with a Simple Method

2005

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In this paper, a new analytical method for defining the nonlinear bond stress-slip models of Fiber Reinforced Plastics (FRP) sheet-concrete interfaces through pullout bond test is proposed. With this method, it is not necessary to attach many strain gages on the FRP sheets for obtaining the strain distributions in FRP as well as the local bond stresses and slips. Instead, the local interfacial bond stress-slip models can be simply derived from the relationships between the pullout forces and loaded end slips. Based on a series of pullout tests, the bond stress-slip models of FRP sheet-concrete interfaces, in which different FRP stiffness, FRP materials (Carbon FRP, Aramid FRP, Glass FRP), and adhesives are used, have been derived. Only two parameters, the interfacial fracture energy and interfacial ductility index, which can take into account the effects of all interfacial components, are necessary in these models. Comparisons between analytical results and experimental ones show good accordance, indicating the reliability of the proposed method and the proposed bond stress-slip models.

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Section: Description Of the Methodologymentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

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Development of the Nonlinear Bond Stress–Slip Model of Fiber Reinforced Plastics Sheet–Concrete Interfaces with a Simple Method

2005

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“…In general, these models can be classified into three categories: i ) empirical models based on the regression of test results (Maeda et al, 1997); ii) engineering formulations based upon simplified assumptions and appropriate safety factors (Brosens and Van Gemert, 1997;Chen and Teng, 2001;Mancusi and Ascione, 2012); iii ) fracture-mechanics-based models (Holzenkämpfer, 1994;Yuan et al, 2001;Neubauer and Rostasy, 1997). Despite the variety of the reinforcing materials, of the strengths of the substrates and of the geometry of the stiffeners, there is a general agreement on many aspects of the failure process.…”

Section: Introductionmentioning

confidence: 99%

“…Since no part of the stiffener is inactive regardless of its D R A F T length, the definition itself of effective bond length needs an engineering interpretation. For example, many researchers define the effective bond length as the bond length over which the shear stresses offer a total resistance which is at least 97% of the ultimate load 3 of an infinite joint (Yuan et al, 2001(Yuan et al, , 2004Wu et al, 2002;Chen et al, 2012). According to other authors, the evaluation cannot but be purely experimental.…”

Section: Introductionmentioning

confidence: 99%

Cohesive debonding of a stiffener from an elastic substrate

Franco

Royer-Carfagni

2014

Composite Structures

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To strengthen concrete or masonry, a modern technique uses adherent strips made of Fiber Reinforced Polymer (FRP). A model problem for this is here considered, represented by an elastic stiffener pulled at one end, in adhesive contact with an elastic half space in generalized plane stress. An analytical solution is developed under the hypothesisà la Baranblatt that cohesive adhesion forces remain active between the two materials when relative slip occurs (provided this is less than a critical value), so that the stress singularity predicted by the theory of elasticity in the case of perfect bonding is removed. We find that the bond length beyond which no further increase of strength could be achieved, referred to as the effective bond length, coincides in practice with the ultimate length of the cohesive zone, i.e., its maximal extension prior that the critical slip limit is attained. The debonding process in a pull-out experiment is analyzed in detail. Results are in better agreement with experimental data than those obtainable with traditional models, which neglect as a rule the deformation of the substrate.

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Interface bond between FRP sheets and concrete substrates: properties, numerical modeling and roles in member behaviour

Ueda¹,

Dai²

2004

Progress Structural Eng Maths

122

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SUMMARYThe success of most of strengthening or retrofitting technologies for concrete structures by using external bonded FRP sheets highly depends on the interface bond between FRP sheets and concrete substrates. This paper reviews current studies on evaluating the bond properties of FRP sheet-concrete interfaces, and in particular, focuses on several newly developed bond models for describing the bond characteristics of FRP sheet-concrete interfaces under various loading conditions. This paper also gives several examples that apply those interfacial bond models to the design of different retrofitting cases. Analytical solutions are discussed that consider the local interfacial delamination and slip behaviour, which can improve the prediction of strength and deformation performances, as well as clarify the failure mechanisms of concrete members upgraded with FRP composites. Moreover, the improvement in structural performances of retrofitted concrete members is discussed by relating them to the optimum microscopic properties of the interface bond and the properties of retrofitting materials.

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Theoretical Solutions on Interfacial Stress Transfer of Externally Bonded Steel/Composite Laminates

Cited by 78 publications

References 10 publications

Development of the Nonlinear Bond Stress–Slip Model of Fiber Reinforced Plastics Sheet–Concrete Interfaces with a Simple Method

Development of the Nonlinear Bond Stress–Slip Model of Fiber Reinforced Plastics Sheet–Concrete Interfaces with a Simple Method

Cohesive debonding of a stiffener from an elastic substrate

Interface bond between FRP sheets and concrete substrates: properties, numerical modeling and roles in member behaviour

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