Concrete Beams with Fiber-Reinforced Polymer Shear Reinforcement

Kim, Dae-Jin; Kim, Min Sook; Choi, Jonghoon; Kim, Hee-Cheul; Scanlon, Andrew; Lee, Young Hak

doi:10.14359/51686633

Cited by 13 publications

(13 citation statements)

References 15 publications

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“…Recent studies investigated the shear capacities of FRP stirrups and proposed an equation of shear strength [12][13][14][15]. Kim et al proposed a new type of FRP shear reinforcement as a substitute for steel stirrups [16]. Plate-type FRP shear reinforcement has better constructability and easier fabrication than FRP stirrups.…”

Section: Introductionmentioning

confidence: 99%

Shear Behavior of Concrete Beams Reinforced with GFRP Shear Reinforcement

Kim

Kim²,

Ko³

et al. 2015

International Journal of Polymer Science

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This paper presents the shear capacities of concrete beams reinforced with glass fiber reinforced polymer (GFRP) plates as shear reinforcement. To examine the shear performance, we manufactured and tested a total of eight specimens. Test variables included the GFRP strip-width-to-spacing ratio and type of opening array. The specimen with a GFRP plate with a3×2opening array showed the highest shear strength. From the test results, the shear strength increased as the strip-width-to-strip-spacing ratio increased. Also, we used the experimental results to evaluate whether the shear strength equations of ACI 318-14 and ACI 440.1R can be applied to the design of GFRP shear reinforcement. In the results, the ACI 440 equation underestimated the experimental results more than that of ACI 318.

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Section: Introductionmentioning

confidence: 99%

Shear Behavior of Concrete Beams Reinforced with GFRP Shear Reinforcement

Kim

Kim²,

Ko³

et al. 2015

International Journal of Polymer Science

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“…Plate type shear reinforcement consists of horizontal and vertical strips, as shown in Figure 1. Kim et al [12] reported that the horizontal components of the plate did not contribute significantly enough to the shear strength. Based on this investigation, the shear strength equation by Kim et al [12] only considered vertical components and used Equation (4) to calculate the cross-sectional area of the FRP reinforcement.…”

Section: Modified Aci Building Code (Kim Et Al [12])mentioning

confidence: 99%

“…where n is number of the GFRP and steel plate vertical components, w f is the width of the GFRP and steel plate and t f is the thickness of the GFRP and steel plate. Kim et al [12] proposed a shear strength equation for concrete beams with shear reinforced FRP plates by modifying the ACI 318-11 shear strength equation [11]. Plate type shear reinforcement consists of horizontal and vertical strips, as shown in Figure 1.…”

Section: Modified Aci Building Code (Kim Et Al [12])mentioning

confidence: 99%

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Improved Shear Strength Equation for Concrete Wide Beams

2019

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Featured Application: This study provides a reasonable method to predict shear strength for concrete wide beams.Abstract: An improved shear strength equation is proposed that considers transverse reinforcement spacing and support conditions for concrete wide beams. Eighteen specimens were fabricated to examine the influence of transverse reinforcement spacing, the number of transverse shear reinforcement, and support width on shear capacity. From the test results, a shear strength equation is proposed and used to evaluate the shear strength of 23 specimens from previous studies and 18 from this study. For the 41 specimens, the proposed shear strength equation results had a mean of 1.16 and a standard deviation of 0.16. It showed that the proposed shear strength equation can predict shear strength reasonably well for concrete wide beams. Appl. Sci. 2019, 9, 4513 2 of 15 reinforcement to investigate the effectiveness of various types of shear reinforcement in improving the shear capacity of wide beams. The results showed that independent bent-up bars increased the shear capacity and ductility of wide beams. The combination of bent-up bars with stirrups can achieved higher shear capacity and gradual failure of wide beams. Conforti et al. [7] conducted shear tests on 14 wide shallow beams with different widths and depths to evaluate shear performance. The experimental results indicated that wide shallow beams with width-to-effective depth ratio from 2 to 3 enhanced shear behavior, and shear equations of current codes do not consider the extra resistance in shear of wide shallow beams. Also, Conforti et al. [8] evaluated the influence of width-to-effective-depth ratio (b/d) and reinforcement spacing-to-effective depth ratio on the shear behavior of reinforced concrete beams without the web reinforcement. The experimental results showed that for b/d > 1, an increase in the b/d determines a non-negligible increment in the shear strength whereas the s/d does not affect the capacity. Khalil et al. [9] analyzed effect of the beam width-to-depth ratio and the column width-to-beam-width ratio. The test results presented that although the beam-width-to-depth ratio and support width has significant influence on shear performance, the predictive equations for shear strength did not take those effect into consideration which leads to a major error in estimating the shear strength of wide shallow beams. A modified formula was proposed to predict the effective width accurately based on statistical procedure.In addition to evaluating the effect of design parameters on the shear capacity for concrete wide beams, recent studies have been conducted to add fiber to concrete. Several authors have performed experiment to determine the shear contribution provided by polypropylene fibers in slender beams. Conforti et al. [10] showed that macro-synthetic fibers can be used as a shear reinforcement in wide shallow beams based on experimental programs. Navas et al. [11] performed the test on 16 full-scale specimens. The results indicated ...

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“…Lastly, a model for evaluating the shear carried by internal CFRP grids in concrete beams was introduced. The validity of the proposed model was considered by comparing the calculatated results with experimental results and also with a set of experimental data from Kim et al 10) .…”

Section: Introductionmentioning

confidence: 99%

Replacement of Conventional Steel Stirrups by Internal Reinforcing CFRP Grids in Shear of Concrete Beams

et al. 2017

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This study proposes an innovative idea of shear reinforcement in concrete beam by replacing the conventional steel stirrups with CFRP grids at the shear span inside concrete cover. The compatibility between the internal grids and the surrounded concrete was investigated first in the elementary test. Flexural performances of two concrete elements reinforced by different spacing of internal grids were compared and discussed. After that, a concrete beam test was conducted with a total of eight RC beams varied in the number of grid strips in the shear span and the spacing of reinforcing grids. The experimental results showed that the shear capacity and the shear carried by internal CFRP grids significantly improved with a higher amount of grid strips; however, the increasing ratio of shear capacity was not proportional to the shear reinforcement ratio. Moreover, the location of internal grid in the shear span was an important part of the shear-resisting effectiveness in this study since the more number of grid strips located near the center of the shear span was much more effective to resist the propagation of diagonal shear crack than the grids at the edge. Finally, a model for evaluating shear carried by internal CFRP grids was introduced. Validity of the proposed model was explained by comparing with the experimental results and also other sets of experimental results.

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Concrete Beams with Fiber-Reinforced Polymer Shear Reinforcement

Cited by 13 publications

References 15 publications

Shear Behavior of Concrete Beams Reinforced with GFRP Shear Reinforcement

Shear Behavior of Concrete Beams Reinforced with GFRP Shear Reinforcement

Improved Shear Strength Equation for Concrete Wide Beams

Replacement of Conventional Steel Stirrups by Internal Reinforcing CFRP Grids in Shear of Concrete Beams

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