Shear Strengthening of Reinforced Concrete Beams Using Epoxy-Bonded FRP Composites

doi:10.14359/531

Cited by 109 publications

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“…The focus of this paper was to provide reliable, practical, and computationally cost-efficient implementation guidelines for nonlinear FE analyses of concrete structures, which can be used as a basis for more complex cases and support the application of nonlinear analyses to real-world engineering problems, e.g., for load-bearing assessment, strengthening assessment, structural health monitoring, and damage identification of building and civil engineering structures. For instance, the use of externally bonded FRP laminates for strengthening and rehabilitation of concrete or masonry structural members [33][34][35] has emerged as an effective technique and found strong interest in both research and practice, which supported the consideration of such a case in this work. The experimental setup is shown in Section 2.…”

Section: Introductionmentioning

confidence: 88%

A Practical Finite Element Modeling Strategy to Capture Cracking and Crushing Behavior of Reinforced Concrete Structures

Mathern

Yang

2021

Materials

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Nonlinear finite element (FE) analysis of reinforced concrete (RC) structures is characterized by numerous modeling options and input parameters. To accurately model the nonlinear RC behavior involving concrete cracking in tension and crushing in compression, practitioners make different choices regarding the critical modeling issues, e.g., defining the concrete constitutive relations, assigning the bond between the concrete and the steel reinforcement, and solving problems related to convergence difficulties and mesh sensitivities. Thus, it is imperative to review the common modeling choices critically and develop a robust modeling strategy with consistency, reliability, and comparability. This paper proposes a modeling strategy and practical recommendations for the nonlinear FE analysis of RC structures based on parametric studies of critical modeling choices. The proposed modeling strategy aims at providing reliable predictions of flexural responses of RC members with a focus on concrete cracking behavior and crushing failure, which serve as the foundation for more complex modeling cases, e.g., RC beams bonded with fiber reinforced polymer (FRP) laminates. Additionally, herein, the implementation procedure for the proposed modeling strategy is comprehensively described with a focus on the critical modeling issues for RC structures. The proposed strategy is demonstrated through FE analyses of RC beams tested in four-point bending—one RC beam as reference and one beam externally bonded with a carbon-FRP (CFRP) laminate in its soffit. The simulated results agree well with experimental measurements regarding load-deformation relationship, cracking, flexural failure due to concrete crushing, and CFRP debonding initiated by intermediate cracks. The modeling strategy and recommendations presented herein are applicable to the nonlinear FE analysis of RC structures in general.

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Section: Introductionmentioning

confidence: 88%

A Practical Finite Element Modeling Strategy to Capture Cracking and Crushing Behavior of Reinforced Concrete Structures

Mathern

Yang

2021

Materials

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“…One model, herein designated as experimental-based approach (Section 3.2), is based on the evaluation of the effective strain fe  , which is estimated through an empirical approach that takes into account the total stiffness of the shear reinforcement and strengthening   fw fw sw sw EE   and the average concrete compressive strength, cm f . Similar approaches have been used to evaluate the shear resistance of NSM and EBR systems [19][20][21][22], and have also been adopted by international codes [15,16].…”

Section: Analytical Formulations 31 Strategy For the Development Of mentioning

confidence: 99%

“…The concept of effective strain to evaluate the shear contribution of the strengthening is usually applied to FRP strengthened elements [19][20][21][22], in which the strengthening material exhibits a linear elastic behavior up to failure. Since steel bars are used in the present work, the assumption of a linear elastic behavior can be used exclusively to calculate an effective strain fe  .…”

Section: Experimental-based Modelmentioning

confidence: 99%

“…9 Table 1 and Table 3; the obtained results are collected in Table 4. is much smaller than in FRP-based techniques [19,22]. The available data is relatively small for this type of approach, and the dispersion of results is high; a larger number of specimens is required for a better model assessment.…”

Section: Validation Of the Experimental Based Modelmentioning

confidence: 99%

“…The first approach, named experimental-based, is supported by the concept of effective strain, like the most of the existing approaches. The calculation of the effective strain can be performed using empirical equations [19][20][21][22] or using a bond model [23]. The second approach, named mechanical-based, is derived by modifying the simplified formulation proposed by Bianco et al [24], originally developed for CFRP strips 3 applied according to the NSM technique.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

RC beams strengthened in shear using the Embedded Through-Section technique: Experimental results and analytical formulation

Breveglieri

Aprile

Barros

2016

Composites Part B: Engineering

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The Embedded Through-Section (ETS) is a recent strengthening technique that has been developed to\ud retrofit existing reinforced concrete (RC) elements with shear reinforcement deficiencies. This technique\ud is based on the execution of holes drilled through the element cross section, in which steel or fiber\ud reinforced polymer (FRP) bars are inserted and bonded to the surrounding concrete with an epoxy adhesive.\ud An experimental program was carried out with RC T-cross section beams strengthened in shear\ud using steel ETS bars. The influence of the inclination and shear strengthening ratio of ETS on the shear\ud strengthening efficiency was evaluated, as well as the interaction of ETS bars with existing steel stirrups.\ud Two different analytical models are presented in this paper in order to calculate the contribution of ETS\ud to shear resistance. The first model follows an empirical approach (experimentally-based approach),\ud while the second model takes into account the physical and mechanical principles of the technique\ud (mechanically-based approach). The predictive performance of both models is assessed by using\ud experimental results available in literature

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Repair and Retrofit of Bridge structural elements: New Cementitious Materials

Ramaswamy

2023

ce papers

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The condition of infrastructure, the constant need to repair and maintain them and the increasing costs associated with the maintenance has led to the search for replacements for steel in new concrete infrastructure around the world. Further, alternatives for repair and strengthening of existing concrete structures ranging from the use of FRP as plates or fabrics wraps to the use of ultra‐high‐performance concrete (UHPC) elements as external reinforcements to achieve requisite strength and serviceability requirements are being attempted. The present study evaluates the performance of repaired/retrofitted structural concrete elements and sub‐assemblages damaged in flexure or shear using different repair schemes including those based on use of FRP plates or wraps, UHPC elements, etc., to restore the capacity of damaged structural concrete elements. An ANSYS based finite element model that accounts for both the constitutive properties of the primary structure in its damaged state and the repair material is used in this study to assess the different repair schemes. The analysis is shown to predict the test results very well. The importance of considering bond slip between rebar and surrounding concrete in the analysis is highlighted. Likewise, the consequence of bond between repair material and the primary structure on the overall structural performance is clearly seen. Performance of normal and high performance of concrete under high temperature resulting in spalling and significant damage from a fire and its rehabilitation with geopolymer concrete will be shown in lab scale tests and simulations. Finally, a field application of load testing of a defunct masonry arch bridge, its retrofit strategy and subsequent deployment with cementitious mixes as a repair to operationalise the bridge with significant cost saving will be illustrated.

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Shear Strengthening of Reinforced Concrete Beams Using Epoxy-Bonded FRP Composites

Cited by 109 publications

References 0 publications

A Practical Finite Element Modeling Strategy to Capture Cracking and Crushing Behavior of Reinforced Concrete Structures

A Practical Finite Element Modeling Strategy to Capture Cracking and Crushing Behavior of Reinforced Concrete Structures

RC beams strengthened in shear using the Embedded Through-Section technique: Experimental results and analytical formulation

Repair and Retrofit of Bridge structural elements: New Cementitious Materials

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