Corner strengthening of square and rectangular concrete-filled FRP tubes

Chen, Linpeng; Ozbakkaloglu, Togay

doi:10.1016/j.engstruct.2016.03.031

Cited by 52 publications

(15 citation statements)

References 38 publications

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“…The majority of the existing experimental and analytical investigations have been carried out to examine the stress–strain response of rectangular concrete columns with or without internal steel reinforcement confined with FRP, subjected to monotonic axial loading. Most of them have examined the experimental behavior and the analytical modeling of small‐scale concrete columns 2–10 and others have been focused on large‐scale specimens 4,11–15 …”

Section: Introductionmentioning

confidence: 99%

Assessment of analytical stress and strain at peak and at ultimate conditions for fiber‐reinforcement polymer‐confined reinforced concrete columns of rectangular sections under axial cyclic loading

Fanaradelli

Rousakis²

2020

Structural Concrete

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Confinement with fiber‐reinforcement polymer (FRP) materials is a technique, which can increase adequately the axial strain ductility of concrete. Plain and reinforced concrete columns, with circular, square and rectangular cross sections, confined with FRP materials, subjected to monotonic or cyclic compressive load, have been extensively studied over the last 35 years. Also, a lot of predictive expressions for peak and ultimate axial strength and strain, suitable for the available concrete sections, have been proposed. However, it is proven that it is difficult to accurately model and predict the behavior of the noncircular confined concrete columns, especially in the presence of internal longitudinal and transverse steel reinforcement, which is the real case for the majority of existing reinforced concrete structures. The presented study gathers all the available test results on square and rectangular reinforced or plain concrete columns confined with FRP materials and other novel techniques, subjected only to cyclic axial loading. It also assesses the performance of four significant expressions published in literature for the prediction of column load and deformation, proposed for the peak and ultimate conditions.

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Section: Introductionmentioning

confidence: 99%

Assessment of analytical stress and strain at peak and at ultimate conditions for fiber‐reinforcement polymer‐confined reinforced concrete columns of rectangular sections under axial cyclic loading

Fanaradelli

Rousakis²

2020

Structural Concrete

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“…Experimental results showed that the load-carrying capacity of the columns increases with the increase of corner radius. Chen and Ozbakkaloglu 5 strengthened the corner of the concrete column and tested sixteen square and rectangular columns. Test results exhibited that the strength softening section was eliminated in the stress-strain curves of the strengthened square and rectangular columns, and the strength of the composite columns was increased.…”

Section: Introductionmentioning

confidence: 99%

High strength expansive concrete-encased-steel filled carbon fiber reinforced polymer tubes under axial monotonic and cyclic load

Cao

et al. 2020

Journal of Composite Materials

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High-strength concrete-encased-steel filled CFRP (carbon fiber reinforced polymer) tube (HCSFC) takes advantages of high strength of concrete, steel and confinement of FRP, resulting in enhanced structural load carrying capacity and deformability. In this study, expansive high-strength concrete is filled between CFRP tube and sectional steel to study the mechanical properties of high-strength expansive concrete-encased-steel filled CFRP tube (HECSFC) under monotonic and cyclic axial compression. Twenty-four specimens were fabricated in this study. The variables included the number of CFRP layers (0, 1, 2 layers), cross-sectional shape (circular and square), self-stress level (with or without self-stress) and loading mode (monotonic and cyclic). Test results show that the peak load of HCSFC specimen is greater than their nominal load-carrying capacity, which indicates that CFRP plays a confinement role on the internal core concrete-encased-steel. As the number of layers increases, both the normalized peak load and the ultimate axial strain increase. For specimens under the same number of layers, cross sectional shape and loading mode, the ultimate axial strain and strain reduction factor of self-stressing specimens are higher than those of nonprestressed specimens. At the same time, it is found that the confinement efficiency of CFRP on circular specimen is higher than that of square specimen. Analytical results show that the modified existing stress-strain models of CFRP confined concrete predict well with the experimental results.

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“…Many studies reported the effectiveness of FRP jacket to enhance both the strength and ductility of concrete columns by providing confinement to the concrete under concentric or eccentric compressive loadings [2,3]. More recently, several studies were focussed on the use of FRP composites for the construction of new concrete structures, such as concrete-filled FRP tubes (CFFTs) and FRP bars reinforced concrete (RC) members [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, the infilled concrete prevents the FRP tube from local buckling. A significant number of studies demonstrated the ability of CFFTs to develop considerable strength, stiffness and ductility, making FRP tube an attractive alternative to steel tube and steel bars [5][6][7][8][9][10]. With the increasing popularity of the construction of CFFTs column in China, a national technical code was developed for the rational design of CFFTs [11].…”

Section: Introductionmentioning

confidence: 99%

Behaviour of concrete-encased concrete-filled FRP tube (CCFT) columns under axial compression

Wang

Sheikh

Hadi

et al. 2017

Engineering Structures

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A new composite column named concrete-encased concrete-filled fibre reinforced polymer tube (CCFT) column has been proposed in this study. This composite column consists of an inner concrete-filled fibre reinforced polymer (FRP) tube, outer concrete confined with polymer grid, and concrete cover. In this study, a total of 16 concrete stub columns were cast and tested under axial compression. Columns were divided into eight groups, which included one group of plain concrete columns, two groups of FRP confined concrete columns, and five groups of CCFT columns. For FRP confined concrete columns, one layer and two layers of carbon FRP (CFRP) sheet were wrapped, respectively. For CCFT columns, glass FRP (GFRP) tube was used to confine the inner concrete, and polymer grid was used to confine the outer concrete. The test results show that considerable increase in strength and ductility can be obtained for CCFT columns. An analytical model has been developed to predict the axial compressive behaviour of CCFT columns. The analytical results have been found to be in good agreement with the experimental results. Based on the analytical model, the influences of different parameters on the axial compressive behaviour of CCFT columns have been investigated through parametric analyses.

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Corner strengthening of square and rectangular concrete-filled FRP tubes

Cited by 52 publications

References 38 publications

Assessment of analytical stress and strain at peak and at ultimate conditions for fiber‐reinforcement polymer‐confined reinforced concrete columns of rectangular sections under axial cyclic loading

Assessment of analytical stress and strain at peak and at ultimate conditions for fiber‐reinforcement polymer‐confined reinforced concrete columns of rectangular sections under axial cyclic loading

High strength expansive concrete-encased-steel filled carbon fiber reinforced polymer tubes under axial monotonic and cyclic load

Behaviour of concrete-encased concrete-filled FRP tube (CCFT) columns under axial compression

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