Behavior of Circular Concrete Cylinders Confined with Both

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Behavior of Circular Concrete Cylinders Confined with Both ...

2004-4-1  Behavior of Circular Concrete Cylinders Confined with Both Steel Spirals and Fiber Composites 나선형 철근 및 섬유에 의하여 동시에 구속된 원형 콘크리트 실린더의 거동 Lee Jung-Yoon (Dept. of Architectural Engineering, Sungkyunkwan University) ;

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Behavior of Circular Concrete Cylinders Confined with Both ...

When the columns of existing RC structures are repaired with FRP composites, the core concrete of the columns is confined by both materials of steel spirals (or steel hoops) and FRP composites because the FRP composites wrap the existing columns which have been already confined with steel spirals or hoops. As the stress-strain curves of steel and fiber are different to each other, the behavior ...

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Behaviour of concrete confined by both steel spirals and ...

The experimental results for the behaviour of concrete columns confined by both steel spirals and fibre-reinforced polymer (FRP) are presented. A total of fifty-six columns were investigated experimentally under axial load.The test program involves the number of FRP layers (1 or 2 layers), the type of FRP (CFRP and BFRP), and the spacing of the steel spirals.

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Compressive Behaviour of Concrete Confined by Aramid

Both circular concrete cylinders with a single spiral and rectangular concrete specimens with two interlocking spirals are investigated. ... It was found that the behaviour of confined concrete is ...

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Stress–strain model for circular concrete columns confined ...

2015-2-1  Development of the proposed model for concrete confined by internal steel and external FRP lateral reinforcement is an effort to address the aforesaid issue. 2.1. Proposed stress–strain curve. Axial stress-axial strain behavior of concrete confined by FRP and lateral steel (tie/spiral) is obtained using the Thorenfeldt et al. equation . This ...

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Comparing the cyclic behavior of concrete cylinders ...

Both strains are used to estimate the volumetric strains of concrete cylinders. Plastic strains from cyclic behavior are also estimated. For the cylinders jacketed by NiTiNb SMA wires, the monotonic axial behavior differs from the envelope of cyclic behavior. The plastic strains of the actively confined concrete show a similar trend to those ...

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Behavior of FRP-confined concrete in annular section ...

2008-4-1  Extensive research has been conducted on FRP-confined concrete using circular solid cylinders confined with an FRP jacket (i.e. FCSC specimens) (e.g. , , , , , , , ). The concrete in such FCSC specimens is uniformly confined by the FRP jacket, and the behavior of such uniformly-confined concrete is now well understood.

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[PDF] Compressive Behavior of Concrete Confined with

This paper presents the experimental results and analytical modeling of the axial compressive behavior of concrete cylinders confined by both glass fiber-reinforced polymer (GFRP) tube and inner steel spiral reinforcement (SR). The concrete structure is termed as GFRP–SR confined concrete. The number of GFRP layers (1, 2, and 3 layers) and volumetric ratios of SR (1.5% and 3%) were the ...

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BEHAVIOUR OF SQUARE CONCRETE COLUMN

2018-6-5  The behaviour of fibre reinforced polymer (FRP)-confined concrete in circular columns has been extensively studied, but much less is known about concrete in FRP-confined square columns, in which the concrete is non-uniformly confined and the effectiveness of confinement is much reduced. The present paper deals with the analysis of experimental

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Experimental behavior of reinforced concrete columns ...

2020-5-20  Results for both unconfined and confined specimens are presented in this section, expressed in terms of the following parameters: concrete axial strength f c0 and f cc at the load peak (P max), f cu0 and f cu at the ultimate load (P u, at a drop of 20% of P max) for the unconfined and confined specimens, respectively; axial strain ε c0 and ε ...

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[PDF] Compressive Behavior of Concrete Confined with

This paper presents the experimental results and analytical modeling of the axial compressive behavior of concrete cylinders confined by both glass fiber-reinforced polymer (GFRP) tube and inner steel spiral reinforcement (SR). The concrete structure is termed as GFRP–SR confined concrete. The number of GFRP layers (1, 2, and 3 layers) and volumetric ratios of SR (1.5% and 3%) were the ...

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Comparing the cyclic behavior of concrete cylinders ...

Both strains are used to estimate the volumetric strains of concrete cylinders. Plastic strains from cyclic behavior are also estimated. For the cylinders jacketed by NiTiNb SMA wires, the monotonic axial behavior differs from the envelope of cyclic behavior. The plastic strains of the actively confined concrete show a similar trend to those ...

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Behaviour of Concrete Confined with Composite Materials

2020-12-13  concrete. Compression tests were conducted on several 3 x 6 in. and 4 x 8 in. (75 x 150 and 100 x 200 mm) concrete cylinders, encased in four different types of composites. The results of the 3 x 6 in. cylinders strength wrapped with composite showed agreement with the failure envelopes of concrete under the action of axial stress f cc'

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Plasticity-based model for circular concrete columns ...

This paper presents a new designed-oriented confinement model for the axial and lateral behavior of circular concrete columns confined with steel ties, FRP composites, and both steel ties and FRP ...

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Strength of Concrete Cylinder Confined by Composite ...

2017-1-17  questions, a number of unreinforced concrete cylinders were prepared and confined with CFRP composites with different fiber orientations and various wrap thicknesses. Then an analytical modeling was performed on the stressstrain behavior of CFRP-confined circular concrete cylinders.Typical response of CFRP-confined concrete is shown in Fig. 1.

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Compressive behavior of concrete columns confined with ...

2019-1-4  3.2 Behavior of FRP -confined circular columns 11 3.3 Behavior of FRP -confined non -circular columns 12 4 Research Methodology 14 4.1 Experimental program 14 4.2 S pecimens design 16 4.3 Material properties 17 4.4 Specimen preparation 20 4.5 Instrumentation 21 4.6 Test procedure 23

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Monotonic and cyclic bond behavior of confined

Cyclic tensile behavior of the NiTiNb SMA wire under residual stress. Figure 3. Dimensions of a reinforcement bar. in figure 1(b) with marked values. In this case, the assigned prestrain was estimated as 4.7% by interpolation from figure 1(b). 3. Specimens and test set-up This study used concrete cylinders with dimensions of

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Compressive behavior of circular and square concrete ...

2020-1-6  This article studies the compressive behavior of concrete columns confined by different basalt fiber–reinforced polymers. A total of 30 columns were divided into 10 groups according to section shapes (circular and square), basalt fiber–reinforced polymer types (unidirectional basalt fiber–reinforced polymer, bidirectional basalt fiber–reinforced polymer, and hybrid basalt fiber ...

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Modeling the behavior of FRP-confined concrete using ...

2016-9-13  The compressive behavior of concrete cylinders confined with fiber reinforced polymer (FRP) composites has been extensively studied during the past two decades. A large number of experimental and analytical studies have been conducted to understand the ultimate conditions of FRP-confined concrete including the compressive strength ( f′ cc ...

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2013 Behaviour of shape-modified columns confined

2020-10-13  Figure 2.3 Stress-strain curves of FRP-confined concrete and Steel-confined concrete (Samaan et al. 1998) ..... 9 Figure 2.4 Richard and Abbot (1975) four parameter stress-strain curve..... 10 Figure 2.5 Stress-strain curves of FRP-confined concrete (Eid and Paultre 2008) . 12

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Behaviour of Concrete Confined with Composite Materials

2020-12-13  concrete. Compression tests were conducted on several 3 x 6 in. and 4 x 8 in. (75 x 150 and 100 x 200 mm) concrete cylinders, encased in four different types of composites. The results of the 3 x 6 in. cylinders strength wrapped with composite showed agreement with the failure envelopes of concrete under the action of axial stress f cc'

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Strength of Concrete Cylinder Confined by Composite ...

2017-1-17  questions, a number of unreinforced concrete cylinders were prepared and confined with CFRP composites with different fiber orientations and various wrap thicknesses. Then an analytical modeling was performed on the stressstrain behavior of CFRP-confined circular concrete cylinders.Typical response of CFRP-confined concrete is shown in Fig. 1.

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Compressive behavior of concrete cylinders confined by ...

Abstract Application of carbon fiber-reinforced polymer (CFRP) is one of the effective strengthening methods for structural members such as reinforced concrete columns and beams. However, air voids and debonds between CFRP and concrete due to poor workmanship may degrade the structural performance otherwise expected by the strengthening. In order to minimize such debonds and ease the ...

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BEHAVIOR OF AXIALLY LOADED CIRCULAR R.C.

2014-9-5  BEHAVIOR OF AXIALLY LOADED CIRCULAR R.C. COLUMN ... to be strengthened as well as upon both the volume and configuration of the wrapped reinforcement. Such parameters include concrete strength, percentage of longitudinal reinforcement, volume of internal stirrups, shape of cross-section, volume of wrapped reinforcement and arrangements of ...

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Behavior of Confined High Strength Concrete Columns

and equal numbers of spiral confined 150 mm diameter circular section columns. The remaining 8 columns were prepared as 4 square and 4 circular plain (unconfined) concrete specimens to establish the properties of uncon-fined concrete and thereby to get comparison of in place strength of concrete with standard cylinder compressive strength.

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Compressive behavior of concrete columns confined with ...

2019-1-4  3.2 Behavior of FRP -confined circular columns 11 3.3 Behavior of FRP -confined non -circular columns 12 4 Research Methodology 14 4.1 Experimental program 14 4.2 S pecimens design 16 4.3 Material properties 17 4.4 Specimen preparation 20 4.5 Instrumentation 21 4.6 Test procedure 23

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Compressive behavior of circular and square concrete ...

2020-1-6  This article studies the compressive behavior of concrete columns confined by different basalt fiber–reinforced polymers. A total of 30 columns were divided into 10 groups according to section shapes (circular and square), basalt fiber–reinforced polymer types (unidirectional basalt fiber–reinforced polymer, bidirectional basalt fiber–reinforced polymer, and hybrid basalt fiber ...

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Behavior and Modeling of Circular Large Rupture Strain

Behavior and Modeling of Circular Large Rupture Strain FRP-Confined Ice under Axial Compression ... Both the compressive strength and the ultimate axial strain of the confined ice were significantly enhanced with an increase of the thickness of the LRS FRP tube. A theoretical model for the LRS FRP-confined ice is proposed, in which the dilation ...

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2013 Behaviour of shape-modified columns confined

2020-10-13  Figure 2.3 Stress-strain curves of FRP-confined concrete and Steel-confined concrete (Samaan et al. 1998) ..... 9 Figure 2.4 Richard and Abbot (1975) four parameter stress-strain curve..... 10 Figure 2.5 Stress-strain curves of FRP-confined concrete (Eid and Paultre 2008) . 12

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Modeling the behavior of FRP-confined concrete using ...

2016-9-13  The compressive behavior of concrete cylinders confined with fiber reinforced polymer (FRP) composites has been extensively studied during the past two decades. A large number of experimental and analytical studies have been conducted to understand the ultimate conditions of FRP-confined concrete including the compressive strength ( f′ cc ...

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