Modeling shear behavior of reinforced concrete beams strengthened with externally bonded CFRP sheets

Khan, Umais; Al‐Osta, Mohammed A.; Ibrahim, Abdulrahman

doi:10.12989/sem.2017.61.1.125

Cited by 11 publications

(6 citation statements)

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“…The ABAQUS software provides two methods for establishing a cohesion model based on traction–separation law: cohesive element and cohesive surface interaction method. Most studies often use the latter [ 26 , 27 ]. For traction–separation law, most studies adopt a two-line constitutive model, which is divided into a linear elastic segment before reaching ultimate strength and a linear decreasing stiffness segment after reaching ultimate strength.…”

Section: Resultsmentioning

confidence: 99%

Durability Investigation on CFRP Strengthened Cementitious Materials in Cold Region

Wang

et al. 2022

Polymers

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Epoxy resin, CFRP (Carbon Fiber Reinforced Polymer) sheet, and concrete flexural specimens are selected to study the durability of carbon fiber strengthened cementitious materials in a cold region. Two exposure environments, chloride immersion and salt-freeze coupling, are set up, and the mechanical deterioration is discussed utilizing a microscopic observation mechanical test and finite element analysis. The damage to the epoxy resin, CFRP sheet, and concrete exerts a more severe performance degradation in the salt-freeze coupling environment when compared with the chlorine salt immersion environment. The freeze–thaw action destroys the bonding surface of CFRP and concrete based on the microscope observation. The flexural strength of the specimens strengthened with CFRP is 3.6 times higher than that of the specimens without CFRP, while the degradation rate is only 50%. These observations show that the strengthened CFRP effectively improves the cementitious material’s flexural performance in the cold region. The finite element model of epoxy and CFRP subjected to chloride immersion and salt-freeze coupling environment is established. The degradation formula of bond performance between CFRP and concrete is proposed. In addition, the flexural mechanical numerical model is established with and without CFRP strengthened concrete, respectively. Research results provide a technical reference for applying CFRP reinforced cementitious materials in a cold region.

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Section: Resultsmentioning

confidence: 99%

Durability Investigation on CFRP Strengthened Cementitious Materials in Cold Region

Wang

et al. 2022

Polymers

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“…Material properties of concrete are obtained from the tests, as shown in Table 3. The C3D8R element is selected to simulate concrete material [24][25][26]. The material properties of the CFRP composite are shown in Table 1.…”

Section: Mechanical Performance Analysismentioning

confidence: 99%

Durability Investigation of Carbon Fiber Reinforced Concrete under Salt-Freeze Coupling Effect

Ji¹,

Li²,

Yang³

et al. 2021

Materials

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In order to study the durability behavior of CFRP (carbon fiber reinforced polymer) reinforced concrete, three category specimens (plain, partially reinforced, and fully reinforced) were selected to investigate its performance variation concerning chlorine salt and salt-freeze coupled environment, which included the microscopic examination, the distribution of chloride ion concentration, and the compressive properties. By observing the microscopic of the specimens, the surface and cross-section corrosion deterioration was examined with increasing exposure time, and the physical behavior of CFRP and core concrete were discussed. The chloride ion diffusion test exerted that the chloride ion concentration in plain specimens is at least 200 times higher than that of fully reinforced specimens. Therefore, the effectiveness of CFRP reinforcement will be proved to effectively hinder the penetration of chloride ions into the core section. The formula of the time-dependent effect of concrete diffusivity with salt-freeze coupling effect was presented and its accuracy verified. A time-varying finite element model of chloride ion distribution was established by using ABAQUS software. It can be seen from the axial compression test that the strength loss rate of three categories of specimens was varied when subjected to the corrosion environment. Therefore, it is proved that CFRP reinforcement can effectively reduce the deterioration of the specimen’s mechanical properties caused by the exposure environment. The research results can provide technical reference for applying the CFRP strengthened concrete in a severe salt-freeze environment.

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“…An elastic-plastic constitutive relationship with strain hardening is assumed for reinforcing steel and embedded steel truss. is model generally yields acceptable results for the response prediction of RC members [16,17]. e concrete compressive strengths were 41.5 and 40.4 MPa for the control beam and the strengthened beam, respectively while the tensile strength for both beams was 4.0 MPa and Young's modulus was 34 GPa.…”

Section: Materials Properties and Modelsmentioning

confidence: 99%

Performance of RC Beams with Embedded Steel Trusses Using Nonlinear FEM Analysis

Arafa

Alqedra

Salim

2018

Advances in Civil Engineering

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The current study investigates the shear performance of reinforced concrete (RC) beams with embedded steel trusses at small shear span to depth ratios a/d using nonlinear finite element (FE) model. Twenty-one (FE) models have been built using ABAQUS software to investigate the effect of different a/d ratios and web reinforcement on the shear performance and failure load of RC beams with embedded steel trusses. This research focuses on obtaining failure loads, failure modes, crack propagation, and midspan deflection from the developed FE models. The numerical results indicated that, using RC beams with embedded truss with different a/d ratios increased significantly the ultimate shear strength compared with the common RC beams. Furthermore, the numerical results confirmed that embedment of steel trusses in RC beams would significantly improve the structural behavior of RC beams at different a/d ratios. In addition, the results indicated that the shear reinforcement has a small effect on failure and midspan deflection of RC beams with embedded angle trusses at different a/d ratios.

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Modeling shear behavior of reinforced concrete beams strengthened with externally bonded CFRP sheets

Cited by 11 publications

References 0 publications

Durability Investigation on CFRP Strengthened Cementitious Materials in Cold Region

Durability Investigation on CFRP Strengthened Cementitious Materials in Cold Region

Durability Investigation of Carbon Fiber Reinforced Concrete under Salt-Freeze Coupling Effect

Performance of RC Beams with Embedded Steel Trusses Using Nonlinear FEM Analysis

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