An incremental inverse analysis procedure for identification of bond-slip laws in composites applied to textile reinforced concrete

Li, Yingxiong; Bielak, Jan; Hegger, Josef; Chudoba, Rostislav

doi:10.1016/j.compositesb.2017.11.014

Cited by 42 publications

(32 citation statements)

References 59 publications

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“…Abschließend wird ein Zusammenhang zwischen Auszugskraft und Rissöffnung eines Faserstrangs hergestellt. Aus dieser Zuordnung kann numerisch die lokale Verbundspannungs‐Schlupf‐Beziehung zurückgerechnet werden , welche Voraussetzung für die Lösung der Differentialgleichung des verschieblichen Verbunds ist.…”

Section: Verankerungsversuch Mit Variabler Einbindelängeunclassified

“…Lorenz und Kulas beschreiben Versuche und Auswertealgorithmen für die Charakterisierung des Verbunds von getränkten textilen Bewehrungen. Im laufenden Großprojekt Carbon Concrete Composites (C 3 ) wurden in den Basisvorhaben für spezielle Materialkombinationen Verbundprüfmethoden vorgeschlagen und passende Auswertemethoden entwickelt . Trotz dieser langjährigen Forschung liegen aber noch keine abgestimmten praxistauglichen Bemessungsmodelle zum Entwurf und zum Nachweis von Verankerungen und Übergreifungen von Carbonbeton vor.…”

Section: Introductionunclassified

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Verankerungsverhalten textiler Bewehrungen in dünnen Betonbauteilen

Bielak

Spelter

Will

et al. 2018

Beton und Stahlbetonbau

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Die Frage der sicheren und sinnvollen Verankerung von textiler Bewehrung im Beton beschäftigt nicht nur Anwender des innovativen Verbundwerkstoffs Carbonbeton. Auch in der Forschung sind für die Thematik des Verbunds und der Verankerung wesentliche Fragen nicht abschließend geklärt. Bisher existiert kein Bemessungsmodell für die Verankerung oder Übergreifung, welches bei der derzeit verfügbaren Bandbreite textiler Bewehrungen mit weicher bis steifer Tränkung gleichermaßen gültig ist. Die unterschiedlichen Versagensmechanismen des Verbunds, die aus den Charakteristika der Materialien resultieren, werden selten klar unterschieden. Dieser Artikel verdeutlicht die Auswirkungen des Formschlusses auf das Verankerungsverhalten am Beispiel einer textilen Bewehrung mit steifer Tränkung und ordnet Ergebnisse von experimentellen Untersuchungen in die bisherige Forschung ein. Hierzu wird ein Prüfaufbau für einen Auszugversuch vorgestellt, welcher auch zur Abschätzung des Verankerungsverhaltens in Praxisprojekten und zur Qualitätskontrolle in der Produktion genutzt werden kann.

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Section: Verankerungsversuch Mit Variabler Einbindelängeunclassified

Section: Introductionunclassified

Verankerungsverhalten textiler Bewehrungen in dünnen Betonbauteilen

Bielak

Spelter

Will

et al. 2018

Beton und Stahlbetonbau

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“…As underlined by the author in previous papers [7,8,14], this choice makes it possible to describe different types of interfacial regime depending on the values of the two coefficients and to derive explicit solutions as well. Different identification procedures can be adopted to calibrate such an interface constitutive law on the basis of the results of suitable tests (see, e.g., [17]), but this is not of interest to this paper.…”

Section: Appendix Amentioning

confidence: 99%

The Effects of an Interlayer Debond on the Flexural Behavior of Three-Layer Beams

Monetto

2019

Coatings

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Debonds at the interfaces between layers of multilayered systems make the degree of the composite action reduce. As a consequence, the global stiffness of such composites decreases. In order to investigate this reduction, even simplified analytical models are preferable to numerical analyses. This paper analyzes the flexural response of a three-point bending three-layer beam having a debonded portion at the upper interface to investigate the effects of the interlayer debond on the flexural stiffness of the three-layer beam and to examine the feasibility of detecting the presence of possible manufacturing or in-service flaws. A more general model proposed and validated previously by the author was specialized to solve the equilibrium problem considered. A parametric analysis was then performed on varying the model parameters and evaluating the maximum deflection to compare with that for perfectly bonded layers as a measure of the reduction of the flexural stiffness due to the presence of the debond. The numerical results obtained show that the flexural behavior of the sandwich beam under consideration is affected strongly by the length of the debond but only moderately by its position along the interface unless the outer faces are quite stiffer than the core.

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“…where G c I and G c II = the fracture toughness in the tangential and normal directions, respectively, A • = area under the normalized bond-slip curve, and T and S = are the peak traction stresses in the normal and tangential directions, respectively. The fracture toughness G c II and the normalized area A • were calculated using Equations (15) and (16), respectively.…”

Section: Cohesive Elementsmentioning

confidence: 99%

“…In other words, they assumed perfect bond between the bar and surrounding grout, which is not the case in grouted corrugated duct connections. Additionally, Li et al [15] used an inverse analysis technique to derive a multi-linear bond-slip law based on FE simulations of pull-out tests.…”

Section: Introductionmentioning

confidence: 99%

Predicting Behavior of Grouted Dowel Connections Using Interfacial Cohesive Elements

Elsayed¹,

Nehdi

Ghrib

2019

Applied Sciences

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Grouted dowel connections are used extensively in precast load bearing walls owing to their simple construction and forgiving tolerances. Current design guidelines do not adequately consider the composite nature of such connections. Moreover, robust numerical models for these connections are yet to be developed. Therefore, a finite element model of grouted dowel connections was developed in this paper. The model adopts a phenomenological bond-slip constitutive law to predict the load versus slip response of grouted bars and considers tensile yielding of the reinforcement. The local bond-slip law used was generated from carefully designed experiments to eliminate spurious effects associated with bond testing. The model was validated using experimental results on grouted connections, as well as data retrieved from the open literature. Excellent agreement between experimental and numerical results was observed, highlighting the accuracy of the model in depicting interfacial stresses of the assembly. The model requires simple calibration, is computationally efficient, and can accurately simulate the failure behavior of bars embedded in grouted connections.

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An incremental inverse analysis procedure for identification of bond-slip laws in composites applied to textile reinforced concrete

Cited by 42 publications

References 59 publications

Verankerungsverhalten textiler Bewehrungen in dünnen Betonbauteilen

Verankerungsverhalten textiler Bewehrungen in dünnen Betonbauteilen

The Effects of an Interlayer Debond on the Flexural Behavior of Three-Layer Beams

Predicting Behavior of Grouted Dowel Connections Using Interfacial Cohesive Elements

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