Experimental and numerical study on flexural behaviors of damaged RC beams strengthened with UHPC layer using the bonding technology of post-installed reinforcing bar

Gao, Xiaolong; Wu, Kai; Yi-qing, Guo; Zhao, Yun-Chuan; Guo, Jun-Yuan

doi:10.1016/j.conbuildmat.2023.131835

Cited by 9 publications

(7 citation statements)

References 27 publications

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“…To study how different horizontal spacings of shear-resistant steel bars, yield strengths of shear-resistant steel bars, compressive strengths of matrix concrete, and diameters of shear-resistant steel bars affect the shear properties at the interface of UHPC and RC, 15 sets of push-out specimens were designed based on previous research [35]. Table 1 shows the specifics of these specimens.…”

Section: Test Overview 21 Push-out Testmentioning

confidence: 99%

“…Table 1 shows the specifics of these specimens. The literature [35] makes reference to each of the materials' mechanical properties for the push-out specimens. Figure 1 displays details of the specimen geometry and steel bars.…”

Section: Test Overview 21 Push-out Testmentioning

confidence: 99%

“…ameters of shear-resistant steel bars affect the shear properties at the interface of UH and RC, 15 sets of push-out specimens were designed based on previous research Table 1 shows the specifics of these specimens. The literature [35] makes reference to of the materials' mechanical properties for the push-out specimens. Figure 1 displays tails of the specimen geometry and steel bars.…”

Section: Test Overview 21 Push-out Testmentioning

confidence: 99%

“…The parameters of UHPC in the CDP model are shown in Table 4. The critical data are adopted from the relevant materiality test data in another paper [35]. The compressive strength f cu of the UHPC compressive stress-strain relationship is defined as 144.1 MPa.…”

Section: Materials Constitution Model Of Uhpcmentioning

confidence: 99%

“…A significant amount of frictional resistance is still produced by the clamping effect even in cases where the post-installed reinforcing bars' embedment depth is insufficient. Gao et al [35] investigated the effect of different post-installed reinforcing bar embedment lengths on the interfacial shear strength and found that a length-to-diameter ratio greater than or equal to 2.5 is sufficient to give full play to the anchorage capacity of strengthened UHPC. Zhu Y [36] and others used the method of "unit node localization tracking", i.e., setting the "localization unit" with material properties much lower than those of the model components, to adjust the activation position of the UHPC reinforcement layer so as to make it coincide with the contact of the unloaded RC interface, and used the damage plasticity model of ABAQUS to simulate the intrinsic model.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation Analysis of the Bending Performance of T-Beams Strengthened with Ultra-High-Performance Concrete Based on the CDP Model

Long,

Jiang,

Zou

et al. 2024

Buildings

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In bridge reinforcement projects, damaged T-beams are the most common objects for reinforcement, yet the interface bonding and bending performance of UHPC reinforcement on T-beams have hardly been studied. To ensure the reliability and stability of UHPC-strengthened T-beams in practical applications, this study introduced a post-installed rebar bonding technique to efficiently connect T-beams with UHPC layers. Initially, using ABAQUS software [2020 version] for finite element simulation, this study investigated the effects of various post-installed rebar parameters (horizontal spacing, yield strength, diameter, and matrix concrete strength) on the shear performance of the UHPC and RC interface, obtaining the optimal connection parameters. Subsequently, by comparing shear formulas in domestic and international standards, a new UHPC-RC steel bar interface shear strength theoretical formula with 93.6% accuracy was derived. Finally, finite element simulations analyzed the impact of different post-installed reinforcing bar layout forms and longitudinal spacing, as well as UHPC-strengthened location and layer thickness, on the bending performance of damaged T-beams. The results showed a good match between simulation outcomes and experimental results, applicable for further reinforcement analysis of T-beams. When the horizontal spacing of post-installed rebars is 12d, with diameters ranging from 10 mm to 14 mm, their anchoring capability is efficiently utilized. A square form of a post-installed rebar with a longitudinal spacing of 300 mm effectively improves the ultimate bending load capacity of the strengthened beam. The simulation analysis and theoretical results help in the design and application of post-installed steel connections and UHPC-strengthened structures in UHPC-strengthened reinforced concrete T-beam structures.

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Section: Test Overview 21 Push-out Testmentioning

confidence: 99%

Section: Test Overview 21 Push-out Testmentioning

confidence: 99%

Section: Test Overview 21 Push-out Testmentioning

confidence: 99%

Section: Materials Constitution Model Of Uhpcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation Analysis of the Bending Performance of T-Beams Strengthened with Ultra-High-Performance Concrete Based on the CDP Model

Long,

Jiang,

Zou

et al. 2024

Buildings

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Experimental and Numerical Study on Flexural Behaviors of Steel-UHPC Composite Beams under Hogging Moment

Mao,

Yin,

Shen

et al. 2024

KSCE J Civ Eng

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Shear strengthening of damaged reinforced concrete beams with iron-based shape memory alloy (Fe-SMA) strips: numerical and parametric analysis

Tabrizikahou,

Białasik,

Borysiak

et al. 2024

Arch. Civ. Mech. Eng.

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Shape memory alloys (SMAs) are metallic materials that are characterized by their ability to restore their original shape after large deformation when activated by heating. This unique property renders SMAs appealing for various civil engineering applications. Iron-based SMAs (Fe-SMAs), including alloys like Fe–Mn–Si, stand out due to their cost-effectiveness and high strength. The primary focus of this research lies in the computational modeling of Fe-SMA strips utilized to reinforce damaged concrete structures. To achieve this, details from an experimental test are leveraged for the computational simulation of real-scale reinforced concrete beams that were first loaded to some level of damage, then released and strengthened, and subsequently retested. The strengthening approach involves the application of external Fe-SMA strips wrapping around the beams. This paper presents an original computational modeling setup that incorporates a switch option for the Fe-SMA material. This feature enables one to use a single simulation platform for the whole process. The significance of this method originates from its capacity to ensure a robust analysis that includes all simulation steps-testing unstrengthened beams, installing and heating Fe-SMA strips, and testing both damaged and strengthened beams—in a single, multi-step analysis. The computational simulation results were compared with the outcomes of the experimental test, revealing an acceptable level of agreement. The findings indicate a substantial increase in both shear strength and ductility as a result of the application of Fe-SMA strips. Additionally, parametric and mesh sensitivity studies were conducted. These aimed to investigate the mesh dependency of the model and to identify the optimal mesh size. Furthermore, variations in the details of the Fe-SMA strips, including thickness, width, quantity, and effect of applied temperature were explored to compare the outcomes of different applications of these strips.

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Experimental and numerical study on flexural behaviors of damaged RC beams strengthened with UHPC layer using the bonding technology of post-installed reinforcing bar

Cited by 9 publications

References 27 publications

Numerical Simulation Analysis of the Bending Performance of T-Beams Strengthened with Ultra-High-Performance Concrete Based on the CDP Model

Numerical Simulation Analysis of the Bending Performance of T-Beams Strengthened with Ultra-High-Performance Concrete Based on the CDP Model

Experimental and Numerical Study on Flexural Behaviors of Steel-UHPC Composite Beams under Hogging Moment

Shear strengthening of damaged reinforced concrete beams with iron-based shape memory alloy (Fe-SMA) strips: numerical and parametric analysis

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