Computational and Experimental Research  of the Contact Debonding Process When Rigid  Reinforcement Is Pressed Into Concrete

Kashevarova, Galina G.; Martirosyan, Anna S.; Мартиросян, А С; Травуш, Владимир

doi:10.15593/perm.mech/2016.3.04

Cited by 6 publications

(6 citation statements)

References 2 publications

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“…As for plain reinforcement bars, shear adhesion of materials is mainly provided by bonding between the cement gel and reinforcement as well as lateral friction. According to numerous researchers (Choi and Lee, 2002;Choi and Yang, 2010;Karpenko, 2001;Kashevarova et al, 2016, Plevkov et al, 2016, mechanical interlocking due to transverse protrusions on the lateral surface is an essential aspect in adhesion when it comes to deformed reinforcement.…”

Section: Case Historymentioning

confidence: 99%

“…Kashevarova and her colleagues described factors affecting the concrete-to-steel bond strength (Kashevarova et al, 2016). The laws of interaction between concrete and reinforcement determine the specifics of reinforced concrete as a material.…”

Section: Case Historymentioning

confidence: 99%

“…An analysis of studies related to the concrete-tosteel bond reveals a mixed approach to the solution (Kashevarova et al, 2016), a lack of a uniform and theoretically substantiated method of calculation (including under non-linear conditions): there is no unified approach to the solution of a problem in obtaining an equation for the compatibility of deformations for various types of force application along the length of the contact area of materials; the stress state of concrete and reinforcement in the contact area (both in the presence and in the absence of circumferential non-through cracks) has not been studied sufficiently; there is no clarity regarding the solution of a problem related to the adhesion of materials and their relative displacement at the elastoplastic stage of linear and non-linear concrete creep; materials of the adhesion theory are not sufficiently widely used in practical methods of designing reinforced-concrete structures and analyzing their sections.…”

Section: Introductionmentioning

confidence: 99%

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Issues Related to the Adhesion Between Deformed Reinforcement and Concrete

Веселов

Chernykh

Maslennikov

et al. 2019

AEJ

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Introduction: Based on an analysis of issues related to the anchorage and active adhesion between deformed reinforcement and concrete, it is possible to identify major problems of concrete-to-steel bond breaking during the operation of bearing building structures. Purpose of the study: The authors seek to determine the mechanism of interaction between concrete and steel in the adhesion contact area, establish a relationship between external force action and crack development in the contact area. Methods: The authors suggest some dependencies to evaluate various test methods when determining the area where two materials, differing in physical characteristics, interact. Approximation to the actual phenomena related to the interaction between concrete and reinforcement, starting from the moment when through and non-through internal cracks form in the contact area and ending with destruction, is a general problem of models describing the adhesion of materials. Results: The theoretical results were compared with the experimental data and recommendations of modern regulatory documents, and it was found that they are in a satisfactory agreement. It was established that the difference of axial deformations of the bar and the surrounding concrete goes into the difference of bending displacements, which explains uneven load distribution across the protrusions. Discussion: Using the suggested dependencies, it is possible to predict crack development in the contact area of the reinforcement and cement binder as well as in the slip area in an extreme case. The concrete tensile strength in particular reinforcedconcrete elements in supporting cross-sections and with anchorage in tensile concrete represents a factor affecting the strength of the concrete-to-steel bond.

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Section: Case Historymentioning

confidence: 99%

Section: Case Historymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Issues Related to the Adhesion Between Deformed Reinforcement and Concrete

Веселов

Chernykh

Maslennikov

et al. 2019

AEJ

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“…This paper presents the results of the development of a mathematical model which takes into account the contact interaction of reinforcement with concrete [5]. The model of Menetrey-Willam [6] based on the Willam-Warnke yield surface [9], including the dependence on three independent invariants of the stress tensor, was adopted as a concrete model. The Willam-Warnke yield surface differs from the Mohr-Coulomb yield surface by the absence of sharp edges, which may cause difficulties in solving the Mohr-Coulomb surface stress.…”

Section: Mathematical Modeling For Describing the Rebar Adhesion Withmentioning

confidence: 99%

“…As it was previously established, the primary reason of adhesion failure of GCR with concrete is the detachment of the reinforcement profile from the main rebar. A cohesive zone model (CZM) [9] is used to simulate this process, where the destruction of the binder matrix is regarded as a gradual separation of the reinforcement periodic profile surface from the main rebar with the subsequent delamination. In this model, the destruction of the contact surface occurs gradually, taking into account the accumulation of defects in the adhesive matrix inside the contact layer.…”

Section: Mathematical Modeling For Describing the Rebar Adhesion Withmentioning

confidence: 99%

Analytical modeling of glass composite and metal reinforcement adhesion with cements and concrete

et al. 2019

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Adhesion refers to the ability of concrete to resist slipping of reinforcement under loading in reinforced concrete products. The term "reinforced concrete" is considered as a uniform composite material as long as there is adhesion on the contact surface between the reinforcement and the concrete. In case of disruption of the reinforcement and concrete interaction, the construction is represented by separate elements. The aim of this work is to simulate the process of glass composite and metal reinforcement adhesion with cement concrete. To solve this problem, analytical modeling was performed in the ANSYS 19.0 Workbench software package, with the help of which the nature of damage accumulation in the rebar and the distribution of stresses in the concrete mass are determined.

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Contact element use peculiarities in the numerical model construction of the reinforcing bar force interaction with an anchoring field

Belutsky

Grinev

Iovenko

2020

Russian journal of transport engineering

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The application experience of non-metallic composite materials is quite wide in foreign countries, as well as systematized and assembled into a single database. In Russia, since the necessary computing resources have become more relevant and accessible for design organizations, independent researchers, and graduate students of higher educational institutions, this question resurfaced only in the last decade. As well as benefits, non-metallic composite reinforcement has its disadvantages, which prevent it from wide usage in structures, including a relatively low elastic module, as well as the inability to bend during installation. To improve the reinforced structures with stressed reinforcement calculation and possible prestressing force loss prediction, the finite element model production has been discussed. This model would allow us to evaluate the damaging shear stresses in the reinforcement region. The bracing formation process in the scope of this model was presented in this article, with the purpose of simulation the contact layer stress-strain state between reinforcement and concrete. The calculation is performed in a linear setting. Model development of a T-section decking component reinforced with a composite reinforcement beam produced via LIRA SAPR software. Exert a force on shank ends that is equivalent to the clamping force when the prestressed reinforcement is released. The authors proposed a selection option of the junction stiffness by stem contact with the anchoring field. The stiffness is assumed to be constant along the entire length of the contact layer. Elastic coefficient variation of the contact layer was performed here. The contact layer is highlighted conditionally as a separate material. A model for three types of materials was discussed. The shear stresses patterns in the contact element region were obtained. The patterns of abutting end reinforcement bars motion are obtained. To create a span element with a pre-tensioned reinforcement, a full-scale experiment was performed, as well as reinforcement abatement. Upon abatement, the retraction was recorded. The retraction results of the shank ends were measured, the values of which are comparable to the numerical motion.

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Computational and Experimental Research of the Contact Debonding Process When Rigid Reinforcement Is Pressed Into Concrete

Cited by 6 publications

References 2 publications

Issues Related to the Adhesion Between Deformed Reinforcement and Concrete

Issues Related to the Adhesion Between Deformed Reinforcement and Concrete

Analytical modeling of glass composite and metal reinforcement adhesion with cements and concrete

Contact element use peculiarities in the numerical model construction of the reinforcing bar force interaction with an anchoring field

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