Shear Behavior of Concrete Beams Reinforced with GFRP Shear Reinforcement

Kim, Hee-Cheul; Kim, Min Sook; Ko, Myung Joon; Lee, Young Hak

doi:10.1155/2015/213583

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…In Figure 8 , the GFRP width of component and spacing are defined. The accuracy of equation (4) was verified by earlier researchers 6,7 . where, V sL is the nominal shear strength provided by longitudinal shear reinforcement, A f is sectional area of a vertical component of GFRP shear reinforcement, f fu is tensile strength of GFRP shear reinforcement, t f is thickness of GFRP shear reinforcement, w f is width of shear reinforcement, and s is center-to-center spacing of longitudinal shear reinforcement.…”

Section: Proposed Shear Strength Equaitonsupporting

confidence: 55%

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Shear Strength of Concrete Wide Beams Shear Reinforced with GFRP Plates

Kim

Kang

Lee

2018

Polymers and Polymer Composites

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This paper discusses the experimental results on the shear behavior of concrete wide beams reinforced with glass fiber reinforced polymer (GFRP) plates as shear reinforcement. In order to examine the shear performance, a total of six concrete wide beams were manufactured and tested. All the specimens were designed to have the same number of legs of shear reinforcement. The transverse spacing of shear reinforcement was considered as a variable to investigate the influence of transverse spacing of concrete wide beams. From the test results, it is observed that the shear strength increased when transverse spacing of the shear reinforcement decreased. In addition, an equation is proposed to predict the shear strength of concrete wide beams in order to consider the influence of transverse spacing of the shear reinforcement. The equation is based on the test results and modified ACI 318–14. It is verified that the proposed equation is considered to be better than ACI 318–14.

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Section: Proposed Shear Strength Equaitonsupporting

confidence: 55%

“…The tensile stress of the GFRP plate was 480 MPa. The GFRP plates were manufactured as shown Figure 1 6,7 .…”

Section: Experimental Programmentioning

confidence: 99%

Shear Strength of Concrete Wide Beams Shear Reinforced with GFRP Plates

Kim

Kang

Lee

2018

Polymers and Polymer Composites

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“…(1) ACI 440.1R [14] provides a shear strength equation for concrete with FRP flexural reinforcement. However, Kim et al [15] verified that in the case of a specimen reinforced by a plate type, substituting the tensile strength for the shear strength in the equation in ACI 318-14 is more reasonable than using the equation described in ACI 440.1R. In this paper, when considering plate type and stirrups as shear reinforcement nominal shear strength is calculated using the equation in ACI 318-14 and Kim et al, as shown in Equations (1)-(4).…”

Section: Lubell's Equation For Support Conditionsmentioning

confidence: 97%

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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“…Previous studies [33][34][35][36][37][38][39] have shown that the shear span-to-depth ratio significantly affects the shear behaviour of RC elements. However, this term has been ignored in current design code equations [40,41], which estimate the shear capacity of RC beams.…”

Section: Shear Span-to-depth Ratio 411 Control Beam Specimensmentioning

confidence: 99%

Shear Behaviour of RC Beams Strengthened by Various Ultrahigh Performance Fibre‐Reinforced Concrete Systems

Mansour

Tayeh

2020

Advances in Civil Engineering

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This study presents a numerical investigation on the shear behaviour of shear-strengthened reinforced concrete (RC) beams by using various ultrahigh performance fibre-reinforced concrete (UHPFRC) systems. The proposed 3D finite element model (FEM) was verified by comparing its results with those of experimental studies in the literature. The validated numerical model is used to analyse the crucial parameters, which are mainly related to the design of RC beams and shear-strengthened UHPFRC layers, such as the effect of shear span-to-depth ratio on the shear behaviour of the strengthened or nonstrengthened RC beams and the effect of geometry and length of UHPFRC layers. Moreover, the effect of the UHPFRC layers’ reinforcement ratio and strengthening of one longitudinal vertical face on the mechanical performance of RC beams strengthened in shear with UHPFRC layers is investigated. Results of the analysed beams show that the shear span-to-depth ratio significantly affects the shear behaviour of not only the normal-strength RC beams but also the RC beams strengthened with UHPFRC layers. However, the effect of shear span-to-depth ratio has not been considered in existing design code equations. Consequently, this study suggests two formulas to estimate the shear strength of normal-strength RC beams and UHPFRC-strengthened RC beams considering the effect of the shear span-to-depth ratio.

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Shear Behavior of Concrete Beams Reinforced with GFRP Shear Reinforcement

Cited by 8 publications

References 9 publications

Shear Strength of Concrete Wide Beams Shear Reinforced with GFRP Plates

Shear Strength of Concrete Wide Beams Shear Reinforced with GFRP Plates

Improved Shear Strength Equation for Concrete Wide Beams

Shear Behaviour of RC Beams Strengthened by Various Ultrahigh Performance Fibre‐Reinforced Concrete Systems

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