Compressive Behavior of Concrete Confined by Various Types of FRP Composite Jackets

Xiao, Yan; Wu, Hsiao-Ming

doi:10.1177/0731684403035430

Cited by 126 publications

(73 citation statements)

References 13 publications

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“…The coarse aggregates and cement paste were torn from the concrete core in the case of NCC-CFRP; however, in the case of HPC a small amount of aggregate and a surface layer of cement paste were detached from the surface of the HPCC-CFRP. This indicates a worse co-operation of the epoxy resin with the surface of high-performance concrete; however, it should be emphasised that this is a phenomenon reported in the literature [11,14].…”

Section: Adhesion Of Cfrp Confinement To the Concrete Surfacementioning

confidence: 76%

The influence of CFRP sheets on the strength of specimens produced using normal concrete and high-performance concrete assessed using uniaxial compression tests

Ostrowski

2017

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The influence of cfrp sheets on the strength of specimens produced using normal concrete and high-performance concrete assessed using uniaxial compression tests Wpływ włókien węglowych na wytrzymałość próbek z betonu zwykłego i wysokowartościowego ściskanych jednoosiowo Abstract This article presents the results of an experimental investigation on the influence of carbon-fibre-reinforced polymer (CFRP) sheets on the strength of short concrete columns constructed from normal concrete (NC) and high-performance concrete (HPC). The results show that external confinement can significantly improve the ultimate strength and strain of the specimens. The stress-strain response of confined concrete depends largely on the type of concrete with regard to its compressive strength. The results demonstrate that composite columns constructed from normal concrete work in an elastic-plastic range with strengthening, whereas strengthening of columns constructed from high-performance concrete did not occur. The study indicates that the confinement .Keywords: composite column, normal concrete, high-performance concrete, carbon reinforced polymer material, stress-strain Streszczenie W artykule przedstawiono rezultaty eksperymentalnych badań poświęconych wpływowi mat z włókien węglo-wych na wytrzymałość krótkich kolumn betonowych wyprodukowanych z betonu zwykłego i wysokowytrzymałościowego. Wyniki wskazują, iż stosowanie CFRP może w znaczący sposób zwiększyć wytrzymałość i odkształcalność próbek. Charakterystyka naprężenie-odkształcenie wzmocnionych kolumn zależy w istotny sposób od wytrzymałości betonu. Wyniki przeprowadzonych badań wskazują na sprężysto-plastyczną ze wzmocnieniem charakterystykę pracy wzmocnionych kolumn z betonu zwykłego, w przeciwieństwie do betonu wysokowartościowego, gdzie wzmocnienie nie występuje. Badania wskazują, iż efektywność wzmocnienia kolumn zespolonych spada wraz ze wzrostem wytrzymałości na ściskanie rdzenia betonowego.Słowa kluczowe: słup zespolony, beton zwykły, beton wysokowytrzymałościowy włókna węglowe, naprężenie-odkształcenie.42

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Section: Adhesion Of Cfrp Confinement To the Concrete Surfacementioning

confidence: 76%

The influence of CFRP sheets on the strength of specimens produced using normal concrete and high-performance concrete assessed using uniaxial compression tests

Ostrowski

2017

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“…Our own results for CFRP confined plain concrete were compared with the test results of Xiao and Wu (2003), Lee et al (2004), Eid et al (2009), andTeng (2004). Because of this procedure, we were able to enlarge our own data base significantly.…”

Section: Comparison With Experimental Results Of Other Research Groupsmentioning

confidence: 97%

“…Because of this, the proposal of Xiao and Wu (2003) was used to involve the unconfined strength into analysis. If fl is deployed in relation to fc0, very good regressions can be found to explain fcc and εccu.…”

Section: Cfrp Confined Plain Concretementioning

confidence: 99%

Proposal of a material model for FRP confined, circular, short concrete columns with and without internal reinforcement

Holschemacher¹,

Kaeseberg²

2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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It is well known that confinement introduced by CFRP (Carbon Fiber Reinforced Polymer) jackets highly increases the ultimate compressive strength and ductility of concrete. Various experimental research programs have been carried out to express the increase in strength and strain by the use of CFRP jackets, but, in the majority of cases, the additional effects of reinforcing elements, like ties or spirals, have not been analyzed very well. This paper provides investigations on wrapped short concrete columns with and without ties and spirals. In an extensive research program the volumetric ratio of the CFRP jacket and the ratio of transverse reinforcement were varied. Thereby, columns with different geometrical shape, different CFRP thickness, and different transverse reinforcement elements were produced. Executed deformation controlled compression tests provided investigations concerning the structural behavior of the test specimens. The main results of these tests will be explained. It was able to find regression curves in order to explain mathematically the influence of the unconfined concrete strength and of the confinement pressure, which is provided by the CFRP confinement and the transverse reinforcement. Further data bases, which are available in literature, confirmed the own proposals. It was possible to find proper common regression curves despite the fact those different testing machines, test setups, and raw materials (for concrete and CFRP confinement) were deployed. As a result, the paper will present a common empirical model for predicting the compressive axial behavior of CFRP confined, short concrete columns with and without reinforcement.

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“…Column wrapping improves the strength and ductility of the concrete and improves its performance under earthquake loads. Xiao and Wu [4,5] wrapped concrete cylinders using various materials and methods. Some were wrapped with carbon fi ber fabrics, while others were wrapped with glass fi ber fabrics.…”

Section: Approximate Analyses For Columnsmentioning

confidence: 99%

Effect of confinement on the interaction diagrams for rc sections with cfrp grids and wraps

Christou¹,

Michael²,

Anastasiou³

et al. 2013

Int. J. CMEM

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Application of CFRP composite materials is a popular method of strengthening reinforced concrete members. Wrapping columns with these materials is used in seismic retrofi ts because of the increase in the strength and ductility of concrete, and therefore, of the column itself. This is particularly benefi cial for compression-controlled columns that fail by concrete crushing due to the fact that ductility and strength of the member is signifi cantly improved. For the design of columns, interaction diagrams are used which defi ne the maximum capacity of compression members that are subjected to axial force and bending moments. This work includes the development of interaction diagrams for circular compression members confi ned with CFRP composites. The concrete confi nement can be light (low confi nement pressure) or heavy (high confi nement pressure). In this paper, three levels of confi nement are evaluated: (a) zero confi nement, (b) light confi nement with the use of a CFRP composite grid, and (c) heavy confi nement with the use of CFRP composite wraps with two different thicknesses of the wrap. A comparison of the unconfi ned section to the light and heavily confi ned sections shows a considerable difference primarily in the compression-controlled region where the axial compression and bending moment are signifi cantly enhanced. The balance point for both light and heavy confi nement has moved higher up on the interaction diagram, which changes the range of the compression and tension zones. This is evident for both light and heavy confi nement. Also, the failure mode of compression-controlled columns is more ductile because of the change in the behavior of concrete due to confi nement. Keywords: CFRP, Confi nement, Interaction Diagram, RC Section Strength.1 INTRODUCTION Confi nement of concrete is an important factor that can change the failure mode of columns due to the increase in ductility of confi ned concrete. When columns with no confi nement fail in a compression-controlled mode (failure by concrete crushing), they exhibit non-ductile behavior, while columns with confi nement exhibit ductile behavior even when failing by concrete crushing.The analysis of concrete columns using an analytical solution is not an easy task. As a result, the analysis of columns is based primarily on the development and use of interaction diagrams and the plot of the load condition in order to defi ne failure of the section. Normally, the confi nement for compression members made from reinforced concrete is provided either by ties or spirals. However, other methods and materials are used in the later years, which can provide increased confi nement, and thus satisfy the requirement for increased ductility. The column wrapping with carbon-fi ber-reinforced polymers (CFRP) composites is a popular alternative for improving the ductility and strength of the concrete material, and thus the seismic resistance of columns. The increased strength of concrete due to the confi nement provided by the CFRP composite material is ...

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Compressive Behavior of Concrete Confined by Various Types of FRP Composite Jackets

Cited by 126 publications

References 13 publications

The influence of CFRP sheets on the strength of specimens produced using normal concrete and high-performance concrete assessed using uniaxial compression tests

The influence of CFRP sheets on the strength of specimens produced using normal concrete and high-performance concrete assessed using uniaxial compression tests

Proposal of a material model for FRP confined, circular, short concrete columns with and without internal reinforcement

Effect of confinement on the interaction diagrams for rc sections with cfrp grids and wraps

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