Post-strengthening rapid repair of damaged RC columns using CFRP sheets for confinement and NSM-CFRP ropes for flexural strengthening

Saeed, Yasir; Aules, Wisam Amer; Rad, Franz N.

doi:10.1016/j.istruc.2022.07.073

Cited by 10 publications

(1 citation statement)

References 87 publications

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“…In recent years, polymer composite materials have been widely used as external reinforcement [ 19 , 20 , 21 , 22 , 23 , 24 ]. This technology for strengthening and repairing existing structural elements has shown effectiveness in various elements, including beams [ 25 , 26 ], columns [ 27 , 28 , 29 ], slabs [ 30 , 31 ], and others.…”

Section: Introductionmentioning

confidence: 99%

Strength of Compressed Reinforced Concrete Elements Reinforced with CFRP at Different Load Application Eccentricity

et al. 2022

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Currently, many studies are devoted to the use of polymer composite materials to increase the strength and stability of concrete elements. In compressed reinforced concrete elements, the bearing capacity depends on the eccentricity of the external application of the external force and the corresponding stress-strain state, as well as the location and number of composite materials glued to the surface of the structure. The choice of a scheme for placing composite materials depending on the stress state of the structure is an urgent scientific problem. At the same time, the issue of central compression and the compression of columns with large eccentricities has been well studied. However, studies conducted in the range of average eccentricities often have conflicting results, which is the problem area of this study. The primary aim of this study was to increase the strength and stiffness of compressed reinforced concrete elements reinforced with composite materials, as well as a comparative analysis of the bearing capacity of ten different combinations of external longitudinal, transverse, and combined reinforcement. The results of testing 16 compressed columns under the action of various eccentricities of external load application (e0/h = 0; 0.16; 0.32) are presented. It is shown that the use of composite materials in strengthening structures increases the bearing capacity up to 41%, and the stiffness of the sections increases up to 30%. Based on the results of the study, recommendations are proposed for improving the calculation method for inflexible columns reinforced in the transverse direction, which take the work of concrete under the conditions of a three-dimensional stress state into consideration.

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Section: Introductionmentioning

confidence: 99%

Strength of Compressed Reinforced Concrete Elements Reinforced with CFRP at Different Load Application Eccentricity

et al. 2022

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Automated structural repair based on continuous carbon fiber reinforced plastic 3D printing and online model reconstruction

Zhang,

Chen,

Chen

et al. 2024

Polymer Composites

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Additive manufacturing of continuous carbon fiber reinforced plastic (CCFRP) has gained increasing prominence in structural repair through material accumulation. However, the repairing process entails laborious preliminary tasks, such as positioning, model reconstruction, and data input. In this article, computer vision is integrated into a CCFRP 3D printing device and a printing path‐selecting strategy is proposed to automate the repair process with accuracy and efficiency. An irregularly damaged structure is placed arbitrarily on the printing platform. Subsequently, the damaged area is extracted by semantic segmentation to construct a 3D model. The printing paths including zig‐zag and contour offset infilling for an irregular damage area are selected, according to the prediction of flexural modulus based on the finite element method. Finally, an in‐situ composite printing is conducted based on coaxial extrusion principle. The results show that the intersection over union (IOU) of regular damaged areas by the applied pyramid scene parsing network (PSPNet) segmentation model is 0.81. Semantic segmentation is more robust than conventional feature extraction based on filtering methods. The appearance of the repaired structure is consistent with that of the surrounding structure. The combination of CV and additive manufacturing technology presents a new way to simplify the repair process and improve repair effects.Highlights An automated repairing system for irregular damaged areas is established. Deep learning for semantic segmentation is integrated into 3D printing. Finite element submodule is introduced to select optimal printing paths. The CCFRP 3D printing is introduced to surface defect repairing.

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Performance evaluation of axially loaded high strength ferrocement confined fibre reinforced concrete columns

Krishna,

Sreekumaran,

Kaliyaperumal

et al. 2024

Innov. Infrastruct. Solut.

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Post-strengthening rapid repair of damaged RC columns using CFRP sheets for confinement and NSM-CFRP ropes for flexural strengthening

Cited by 10 publications

References 87 publications

Strength of Compressed Reinforced Concrete Elements Reinforced with CFRP at Different Load Application Eccentricity

Strength of Compressed Reinforced Concrete Elements Reinforced with CFRP at Different Load Application Eccentricity

Automated structural repair based on continuous carbon fiber reinforced plastic 3D printing and online model reconstruction

Performance evaluation of axially loaded high strength ferrocement confined fibre reinforced concrete columns

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