a model for the bondslip of a gfrp bar in concrete

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A model for the bond-slip of a GFRP bar in concrete ...

Sep 01, 2017  A commercially available GFRP bar with a fine sand coated and helically wrapped fiber surface and a nominal diameter of 12.7 mm was investigated in this study. First, the pull-out test was performed on GFRP bars embedded in concrete cylinders. The average bond-slip relationship was extracted using the experimental data.

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A model for the bond-slip of a GFRP bar in concrete ...

Proposing a parametric bond-slip law for a GFRP composite bar in concrete based on an experimental study. Explicit modeling of the bond action between the concrete and GFRP reinforcement. Presenting the difference of nodal and average bond-slip models by

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A model for the bond-slip of a GFRP bar in concrete ...

Sep 01, 2017  T1 - A model for the bond-slip of a GFRP bar in concrete. AU - Gooranorimi, Omid. AU - Suaris, Wimal. AU - Nanni, Antonio. PY - 2017/9/1. Y1 - 2017/9/1. N2 - Glass fiber reinforced polymer (GFRP) bars are emerging as desirable alternatives for traditional steel reinforcements in concrete

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A model for the bond-slip of a GFRP bar in concrete ...

The experimental data was employed to develop a parametric bond-slip law for the GFRP bars in concrete [32]. The proposed model consists of three stages and five parameters as shown in Fig. 2 ...

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A Model for the Bond-slip of a GFRP Bar in Concrete

Sep 01, 2017  A Model for the Bond-slip of a GFRP Bar in Concrete. Glass fiber reinforced polymer (GFRP) bars are emerging as desirable alternatives for traditional steel reinforcements in concrete industry. A proper bond between concrete and reinforcement is critical for the performance of reinforced concrete structures.

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Modelling the bond in GFRP bar reinforced concrete thin ...

Apr 01, 2020  Local bond-slip model obtained from the eccentric pull-out experimental tests having the same GFRP bar, same concrete cover and similar concrete mechanical properties was employed in this study. Instead, in the case of perfect bond simulation, it was used the concrete tension stiffening law proposed by Bischoff and Paixao [26] , suitable for ...

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(PDF) The Evaluation of Bond-slip Behaviour of GFRP Bars ...

The Evaluation of Bond-slip Behaviour of GFRP Bars in Conventional and Sustainable Concrete Al‐Khafaji, A.F.1, Myers, J.J.2, Alghazali, H.3 1 Graduate Research Assistant and Ph.D. Student, Missouri University of Science and Technology, Rolla, Missouri, USA 2 Professor of Civil, Architectural, and Environmental Engineering and Associate Dean, Missouri University of Science and Technology ...

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GFRP BARS IN CONCRETE TOWARD CORROSION-FREE RC

Comprehensive understanding of the bond between GFRP bars and concrete, in particular under in-service conditions or extremely severe events, enables scientists and engineers to provide their proper design, assessment and long-term predictions, and ultimately to implement them toward

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Experimental study of bond-slip of GFRP bars in concrete ...

A total of 12 pull-out specimens were tested for a period of between 90 and 130 days. Two concrete strengths (35 MPa and 50 MPa), two bond lengths (5 and 10 times the diameter of the reinforcing bar) and two reinforcing materials (glass fibre reinforced polymer (GFRP) and steel) were used.

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Bond of GFRP Bars in Concrete: Experimental Study and ...

Results of the study were summarized in the form of local bond-slip curves, whereby performance limit states were quantified by the amount of loaded end slip and bond strength. An analytical model of the bond stress-slip response of a GFRP bar was derived from first principles and calibrated against the test data of the present investigation.

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ANALYTICAL BOND MODEL FOR GFRP BARS TO STEEL FIBER ...

The first bond-slip relationship for GFRP bars was presented by Malvar in 1995. Later on, Cosenza et al. (1997) adopted for FRP bars the bond-slip constitutive law proposed by Eligehausen et al. (1983) for steel bars. This model is known as “double branch” and

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Analytical Bond Model for GFRP Bars to Steel Fiber ...

Dec 06, 2013  Analytical Bond Model for GFRP Bars to Steel Fiber Reinforced Self-Compacting Concrete ... the bond between bars and surrounding concrete influences significantly the crack width and crack spacing. The proposed bond model was established by calibrating the parameters of a multilinear bond-slip constitutive law using the experimental results of ...

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Bond between GFRP bars and concrete.

Although the use of GFRP bars solves the corrosion problem of the steel bars used in traditional concrete, other inconvenients may appear, such as the bond between GFRP bars and concrete. We started this thesis by collecting an extensive bibliography collection about the state of the art of bond of steel/GFRP bars for concrete.

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Bond strength of geopolymer concrete with steel and GFRP bars

the bond-slip behavior of GPC with both steel and GFRP reinforcement bar will be investigated. The results obtained in this work showed that GPC has a high er bond strength than the values ...

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Time-Variant Strength Capacity Model for GFRP Bars ...

for assessing the residual strength of GFRP bars embedded in con-crete. Two limitations common to all the available models are that (1) only limited long-term data on the performance of GFRP bars embedded in concrete were used (most data are for accelerated ex-posure conditions, and the exposure periods were less than three

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Evaluation of bond stress-slip models for FRP reinforcing ...

Evaluation of bond stress-slip models for FRP reinforcing bars in concrete Xiaoshan Lin, Y.X. Zhang⇑. School of Engineering and Information Technology, The University of New South Wales at the Australian Defence Force Academy, Northcott Drive, Canberra, ACT 2600, Australia

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(PDF) Bond stress-slip behaviour: Case of GFRP bars into ...

Bond characteristics of straight- and headed-end, ribbed-surface, GFRP bars embedded in high-strength concrete By Khaled Sennah and Hamdy Afefy Experimental study of bond behaviour between concrete and FRP bars using a pull-out test

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Mechanical Properties of the Bond Between GFRP Reinforcing ...

Sep 02, 2014  Test results: bond–slip relationships τ–s for GFRP bars (a) and the marked-out part of the graphs on an enlarged scale (b). Full size image A similar shape of the bond–slip curve was obtained for the steel-reinforced specimens (Fig. 8 ).

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Accelerated ageing tests and long-term prediction models ...

environmental effects on concrete compressive strength, FRP-bar constituent materials, and bond interface are examined. To simulate the pullout failure process, a new concept is proposed to determine the local bond-slip law for FRP bars in concrete. The predicted bond slip curves from analytical and Finite Element methods are in good agreement with

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Frontiers Flexural Behavior of Simply Supported Beams ...

May 25, 2021  In order to study the flexural behavior of simply supported beams consisting of gradient concrete and GFRP bars, 28 simply supported beams were designed. The main parameters included the strength grades of high-strength concrete (HSC), GFRP reinforcement ratio, and sectional height of HSC. Based on nonlinear constitutive models of materials, meanwhile, considering the bond slip

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Experimental study of bond-slip of GFRP bars in concrete ...

A total of 12 pull-out specimens were tested for a period of between 90 and 130 days. Two concrete strengths (35 MPa and 50 MPa), two bond lengths (5 and 10 times the diameter of the reinforcing bar) and two reinforcing materials (glass fibre reinforced polymer (GFRP) and steel) were used.

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Bond strength prediction of spliced GFRP bars in concrete ...

displacement modulus of GFRP bars and finally presented a relationship for the bond strength of spliced GFRP bars in RC beams considering the non-uniform distribution of the bond stress along with the splice and effects of the elasticity modulus of the GFRP bars. Koroglu (2018) proposed ANN and regression models to forecast the FRP bar-concrete

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Experimental Studies on Bond Performance of BFRP Bars ...

At present, there are five main kinds of bond-slip models. ˜e BPE model (hausen et˛al. 1983)was proposed by Elligehausen based on the bond-slip curve of deformed steel bars, which is also applicable to the bonding test of FRP bars and concrete. Malvar proposed a Malvar model (ar 1995)ased on the bond test between GFRP and concrete.

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Experimental Studies on Bond Performance of BFRP Bars ...

Nov 04, 2019  The BPE model (Eligehausen et al. 1983) was proposed by Elligehausen based on the bond-slip curve of deformed steel bars, which is also applicable to the bonding test of FRP bars and concrete. Malvar proposed a Malvar model (Malvar 1995 ) based on the bond test between GFRP and concrete.

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Mechanical Properties of the Bond Between GFRP Reinforcing ...

Sep 02, 2014  Test results: bond–slip relationships τ–s for GFRP bars (a) and the marked-out part of the graphs on an enlarged scale (b). Full size image A similar shape of the bond–slip curve was obtained for the steel-reinforced specimens (Fig. 8 ).

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Tension-stiffening model for FRC reinforced by hybrid FRP ...

GFRP bars, a minimum concrete cover is used in order to assure proper transmission of bond forces and maximize the inner lever arm formed by GFRP bars and concrete under compression. Some research has already been carried out where GFRP and steel bars are combined [10-12], and it is reported an improvement in the flexural behavior

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Long-term durability prediction models for GFRP bars in ...

Nov 10, 2011  Based on the short-term test results, the dominant degradation mechanism for GFRP bars in concrete was found as the deterioration of fiber/matrix interface. A degradation model based on Arrhenius concept and prediction procedures are given, and

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Simulation of Concrete Beams Strengthened by Embedded ...

fitted with ETS GFRP bars (B1, B2) due to the low Young’s modulus of GFRP bars. This discrepancy can be explained by the difference between the assumed bond-slip model and the actual bond-slip relationship. The relevant discussion can be found in the section below.

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A Modified Model for Deflection Calculation of Reinforced ...

The authors carried out experimental and analytical research to evaluate the flexural capacity and the moment-deflection relationship of concrete beams reinforced with GFRP bars. The proposed model to predict the effective moment of inertia for R/C beam with GFRP bars was developed empirically, based on Branson’s equation to have better accuracy and a familiar approach to a structural engineer.

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Bond-slip effect in flexural behavior of GFRP RC slabs ...

A proper bond mechanism between GFRP bar and concrete is essential to ensure proper functioning of such structures. The slippage between the concrete and reinforcement has usually been ignored in numerical modeling of reinforced concrete (RC) structures. ... The result obtained by incorporating the bond-slip model showed a better agreement with ...

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DEVELOPMENT OF ANN-BASED MODELS TO PREDICT THE

adequacy to model FRP-concrete bond. Three most promising models for GFRP rebars were evaluated and compared with a finite element model for the analysis of GFRP-reinforced concrete beams. Besides, several works used these models to analyze the bond behavior of GFRP bars in different materials and environments [11], [12].

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Structural Behavior of GFRP-Reinforced Circular HFRC ...

Aug 31, 2020  The previous research is rich in plain concrete columns reinforced with glass fiber-reinforced polymer (GFRP) bars, but it is deficient in GFRP-reinforced concrete columns incorporating hybrid fibers. The present study aims to explore and compare the structural behavior of steel and GFRP-reinforced concrete columns having hybrid fibers (SHFC and GHFC columns). Two types of fibers,

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Experimental Study on the Bond Performance between Fiber ...

for R-GFRP-10-5D-C70 (31.84MPa), as shown in Figure7(c).epossiblereasonisthatbasaltfiberhasbetter bondingperformancewithpolyesterresincomparedtoglass

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EFFECT OF ELEVATED TEMPERATURES ON THE BOND

Finally, bond-slip models that describe the GFRP-concrete bond constitutive relation as a function of temperature are also not available in the literature. This paper presents experimental and analytical investigations on the effects of moderately elevated temperatures on the bond between GFRP rebars and concrete.

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