Experimental investigation on low-velocity impact behavior of CFRP wraps in presence of concrete substrate

Wang, Bu; Wu, Xianhui; Sun, Zhuo; Liang, Jiaqi; Mao, Xiaopeng; Bi, Tiechuan; Song, Yu; Wei, Yang

doi:10.1016/j.conbuildmat.2021.124103

Cited by 10 publications

(3 citation statements)

References 38 publications

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“…Short-cut fibers are currently being considered as an approach for improving concrete, in terms of both strength and strain capacity [1][2][3][4], while unidirectional continuous fibers have been widely used for strengthening concrete structures [5][6][7]. Theoretically, the development of concrete microcracks can be prevented by the inclusion of short-cut fibers to some extent [8].…”

Section: Introductionmentioning

confidence: 99%

Parametric Study on Mechanical Properties of Basalt Fiber-Reinforced Pea Gravel Concrete

Li,

Wang,

Zhang

et al. 2024

Buildings

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Basalt fiber-reinforced pea gravel concrete (BFRPGC) has remarkable potential for use as the retrofitting covers for masonry walls. However, a quantitative understanding of the mechanical properties of the BFRPGC material is still a perceived gap in the current literature. In this study, the role of basalt fibers in pea gravel concrete was evaluated by a comprehensive experimental investigation involving compressive strength tests and splitting tensile tests. Fiber length and volume fraction were selected as the key parameters. Two fiber lengths of 6 mm and 12 mm were considered, while the volume fraction corresponding to each of the fiber lengths was increased from 0.3% to 0.8%, with a step of 0.1%. The measured strengths were not simply proportional to the fiber volume fraction. The reason behind this phenomenon, i.e., the coupling effect of the bridging role of basalt fibers on concrete microcracks and the fiber agglomeration in concrete, was analyzed. The best performance of the BFRPGC material was achieved by incorporating 12-millimeter-length fibers with a volume fraction of 0.4%. Compared to that of the reference pea gravel concrete, a significant increase of up to 44.5% in compressive strength was recorded in this case. Furthermore, the failure mechanism of basalt fibers in pea gravel concrete was disclosed via the scanning electron microscope observations. In addition, the uniaxial compressive stress–strain model of the BFRPGC material was established.

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Section: Introductionmentioning

confidence: 99%

Parametric Study on Mechanical Properties of Basalt Fiber-Reinforced Pea Gravel Concrete

Li,

Wang,

Zhang

et al. 2024

Buildings

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“…Dong [ 20 ] and Ding [ 21 ] reported that the enhancement with FRP could increase the lateral stiffness of RC columns, reduce the deformation, and change the failure mode from shear to flexure. Wang et al [ 22 ] stated that the initial kinetic energy level of the impactor had a significant influence on the impact behavior and damage degree of CFRP-strengthened RC columns. Xu et al [ 23 ] tested RC circular cantilever columns strengthened in shear with CFRP wraps by horizontally lateral impacts and showed the results that a sufficient amount of CFRP wraps based on the static design requirement of shear retrofitting could effectively control the shear damage and change the failure from shear to flexure.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on Dynamic Response of CFRP-Wrapped RC Columns under Lateral Impact Loading

Liu

Chen

et al. 2023

Materials

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This paper presents a numerical study examining the dynamic response and resistance mechanism of reinforced concrete (RC) columns strengthened with or without carbon-fiber-reinforced polymer (CFRP) wraps under lateral impact loading by using the software LS-DYNA. First, the information of eight column models was briefly introduced as part of the laboratory experimental program from the literature. Secondly, finite element (FE) models were established in terms of the geometries of impact tests. Then, a detailed comparison between numerical results and experimental results was made, and FE models showed a relatively high simulation accuracy. Subsequently, a series of parametric analyses were carried out with a focus on the effects of axial compression ratio, the boundary condition at the column top, the layer number of CFRP wraps, and the impact velocity and impact height on the dynamic responses of plain and strengthened columns. The results demonstrated that the CFRP retrofit mechanism was not activated during the initial Stage-I when the impact force rapidly increased to the first peak and then decreased to zero. CFRP strengthening came into play in the second stage, Stage-II, and affected the response of the shear force and moment along the column height, as well as had a great influence on the control of shear damage. The dynamic response of RC columns was more sensitive to the impact velocity than to other parameters, regardless of whether CFRP wrapping was applied. The axial compression ratio would have a different influence on the column failure mode if the impact velocity was varied. The variation in impact height and boundary condition at the column top had little influence on the damage mode of strengthened columns.

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“…In comparison to the conventional strengthening materials, fiber-reinforced polymer (FRP) materials have several advantages, and these merits are widely discussed in the literature [ 1 ]. Externally bonded FRP systems are used to upgrade the various RC elements in the different loading scenarios [ 1 , 2 , 3 ]. From a practical standpoint, FRP materials may also have the potential to be used for the shear retrofit of RC joints.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness and Efficiency of Externally Bonded CFRP Sheets for Shear Strengthening of RC Beam-Column Joints

Wang

Liu³

et al. 2022

Polymers

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To develop feasible carbon fiber reinforced polymer (CFRP) retrofit schemes for the shear strengthening of real three-dimensional reinforced concrete (RC) beam-column joints, a series of parameters in relation to the contributions of the CFRP sheets externally bonded to joint panels was numerically investigated in this study. The parameters include CFRP reinforcement ratio, CFRP layout, transverse beam-to-joint panel width ratio, transverse beam-to-joint panel height ratio, location of transverse beam, and number of transverse beams. Strengthening efficiency, a new dimensionless index, was introduced to evaluate the residual effect of a CFRP-strengthening system weakened by the presence of transverse beams in comparison with the increase in joint shear capacity in relation to the one-way counterpart. The results obtained from 44 nonlinear finite element models, which were calibrated against experimental observations, confirmed the effectiveness of the CFRP strengthening technique with regard to the relatively wide ranges of the parameters. The significant differences among the roles of the parameters were revealed, and the reasons behind the differences were analyzed. Furthermore, the shear mechanism of the CFRP-retrofitted joint panels was discussed with the proposed strut-and-tie model.

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Experimental investigation on low-velocity impact behavior of CFRP wraps in presence of concrete substrate

Cited by 10 publications

References 38 publications

Parametric Study on Mechanical Properties of Basalt Fiber-Reinforced Pea Gravel Concrete

Parametric Study on Mechanical Properties of Basalt Fiber-Reinforced Pea Gravel Concrete

Numerical Analysis on Dynamic Response of CFRP-Wrapped RC Columns under Lateral Impact Loading

Effectiveness and Efficiency of Externally Bonded CFRP Sheets for Shear Strengthening of RC Beam-Column Joints

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