Flexural bearing capacity of reinforced concrete beams reinforced with carbon fiber reinforced plastics strips and ultra-high performance concrete layers

Liu, Long; Wan, Songqiang

doi:10.1108/ijbpa-04-2022-0056

Cited by 6 publications

(5 citation statements)

References 36 publications

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“…After 10 years of service, the deterioration of the bottom of the RC deck did not significantly progress, primarily because the UHPC surface layer prevented the infiltration of environmental factors attacking this region. The effectiveness of UHPC overlays has been confirmed in several studies by authors such as Hoang [7], Liu [8] and El-Mandouh [9]. Fiber-Reinforced Polymer (FRP) sheets are commonly used for the repair and strengthening of steel-reinforced concrete structures [1].…”

Section: Introductionmentioning

confidence: 90%

Rehabilitation of reinforced concrete slab using ultra high-performance concrete and fiber reinforced polymer

Hoang Viet,

Nguyen Hoang

2024

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Rehabilitation the flexural capacity of reinforced concrete structures has been the subject of many studies. However, there is currently limited research on repairing such structures using Ultra-High-Performance Concrete (UHPC) and the combination of UHPC with Fiber-Reinforced Polymer (FRP) materials. This article presents the results of an experimental study on the flexural behavior of 4 specimens: 1 specimen of reinforced concrete (RC), 1 specimen strengthened with FRP sheets, and 02 specimens with the same height as the RC specimen but with a replacement of 3 cm of the protective concrete layer with a UHPC layer, either bonded or not bonded to the existing concrete, with or without the reinforcement of FRP sheets. The experimental results of the 4-point bending tests indicate that, while maintaining the height of the RC specimen constant, replacing the protective concrete layer with a UHPC layer and incorporating FRP in the tension zone led to an increase of approximately 83.35% in flexural capacity, with the deflection at the failure stage rising by only 12.8%. This research opens up a new and promising direction for improving and extending the service life of RC bridges using UHPC and FRP

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Section: Introductionmentioning

confidence: 90%

Rehabilitation of reinforced concrete slab using ultra high-performance concrete and fiber reinforced polymer

Hoang Viet,

Nguyen Hoang

2024

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“…(2) Structural safety assessment of corbel beams by finite element simulation based on real state Method ( 2) is based on the safety inspection and test data for finite element simulation, analyzing the stress distribution state of the corbel beam structure under the real state, finding out the dangerous area of its stress concentration, and assessing the working state of the corbel beam structure in combination with the field inspection. Then, the shear force of the corbel beam structure subjected to the center point of the radial gate support thrust at the cross-section is calculated and brought into equation ( 4) for calculation [31][32][33]. Finally, considering the field test data, simulation results analysis, and review calculation results, an accurate safety assessment of the corbel beam structure is made.…”

Section: Structural Safety Review Methods For Corbel Beamsmentioning

confidence: 99%

Research on the Safety Assessment of Corbel Beams of Reservoir Radial Gates Based on Real States

et al. 2023

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The radial gate corbel beam is a kind of gate support structure more often used in large and medium-sized reservoirs, but the current corresponding structural design code does not give a review calculation method for it. Because there are obvious differences between a corbel and a corbel beam in structural form and force, if the corbel beam is just simplified in the calculation as a corbel structure, it can easily lead to misjudgment of insufficient bearing capacity. This misjudgment has a significant impact on later safety assessment, danger removal, and reinforcement. Currently, there are limited studies available on the internal stress distribution of the corbel beam. In this study, taking the danger removal and reinforcement of the radial gate beam of a medium reservoir in Beijing as an example, the concrete quality of the dam was tested by the core drilling method, and two safety review methods of the corbel beam for different types of reservoirs were proposed in combination with the Code for Design of Hydraulic Concrete Structures (SL191-2008). Then, three different types of calculation model were established by the method of theoretical mechanics calculation and finite element simulation. Combined with the safety test data, the stress state of the combined stress structure of the corbel beam and gate pier under the real state was analyzed and the safety evaluation was carried out. The calculation results of these two corbel beam safety review methods were respectively reduced by 32% and 47% compared with the current calculation method. Engineering practice has proved the rationality of the two safety evaluation methods proposed in this paper, which can provide a certain reference for similar engineering reinforcement.

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“…Te "Tie" method is used to simulate the interaction between beam and pad, and the "Embedment" method is used to simulate the interaction between beam, rebar, and bolt. Te mesh size of the fnite element model is 40 × 40 mm [30,31]. Te fnite element model is shown in Figure 3.…”

Section: Finite Element Modelmentioning

confidence: 99%

“…Te fnite element model of the RC beam was established, and the fnite element model results were compared with the experimental results in the literature [29]. Te rationality of the fnite element model was verifed by comparison of the loaddefection curve, crack distribution, and failure modes, which is a common research method [30,31]. A more detailed study was carried out on the parameters of the new reinforcement method later, including the thickness of the UHPC layer, the cross-section area of longitudinal tension rebar, and concrete strength.…”

Section: Introductionmentioning

confidence: 99%

Flexural Reinforcement of Over-Reinforced Beam by Ultrahigh Performance Concrete Layer

Yang

Yao

Liu

2022

Mathematical Problems in Engineering

Self Cite

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In order to improve the failure state of over-reinforced beams and enhance their ductility, an innovative reinforcement method was proposed by adding an ultrahigh performance concrete (UHPC) layer on the top surface of the over-reinforced beam to take advantage of the high compressive strength of UHPC. The numerical simulation method was used to carry out the research. The validity of the finite element model was verified by comparing it with the experimental results, and the effectiveness of the new reinforcement method was verified by comparing it with the calculation results after adding the UHPC layer. Then, a detailed parameter study was carried out, including the thickness of the UHPC layer, the cross-section area of longitudinal tension rebar, and concrete strength. The load-deflection curve, flexural bearing capacity, and deflection ductility coefficient were studied. The results show that the bearing capacity of the UHPC-reinforced over-reinforced beams is significantly increased by 88.1%. And the stiffness and ductility of the beams are also significantly increased, with the ductility coefficient reaching 23.85. In addition, flexural bearing capacity increases with the thickness of the UHPC layer and sectional area of longitudinal tension rebar. Finally, a prediction model for the flexural bearing capacity of UHPC layer-reinforced over-reinforced beams is proposed, which further verifies the effectiveness of this method.

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Flexural bearing capacity of reinforced concrete beams reinforced with carbon fiber reinforced plastics strips and ultra-high performance concrete layers

Cited by 6 publications

References 36 publications

Rehabilitation of reinforced concrete slab using ultra high-performance concrete and fiber reinforced polymer

Rehabilitation of reinforced concrete slab using ultra high-performance concrete and fiber reinforced polymer

Research on the Safety Assessment of Corbel Beams of Reservoir Radial Gates Based on Real States

Flexural Reinforcement of Over-Reinforced Beam by Ultrahigh Performance Concrete Layer

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