Axially Loaded Reinforced Concrete Columns with a Square Section Partially Confined by Light GFRP Straps

Triantafyllou, Garyfalia G.; Rousakis, Theodoros; Karabinis, Athanasios I.

doi:10.1061/(asce)cc.1943-5614.0000496

Cited by 77 publications

(51 citation statements)

References 43 publications

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“…A significant enhancement of the strength, as well as the ductility for the GFRP-SR confined cylinders, was achieved by increasing the thickness of GFRP tubes and the volumetric ratio of SR. For example, the average compressive strength obtained for specimens P1S2 and P2S1 were 70.95 MPa and 109.71 MPa, respectively, whereas the average ultimate compressive strain determined for specimens P1S2 and P2S1 were 0.0222 and 0.0244, respectively. The ultimate condition shown in Table 3 was dominated by the rupture of the GFRP tube and the rupture of GFRP in specimens with higher volumetric SR ratio, which corresponded to larger axial compressive strength and strain, as reported also by Lee et al [34]. The concrete ultimate axial strains (εcu) corresponding to failure varied widely from 0.0222 to 0.03, with a tendency to increase for specimens with more GFRP layers and higher SR volumetric ratio.…”

Section: Residual Compressive Behavior Of Confined Concrete After Rupsupporting

confidence: 73%

“…The final failure of FRP-confined concrete corresponding to the rupture of FRP is very sudden and explosive because of the linear elastic tensile stress-strain behavior of FRP, thus, relatively high compression strength as well as high ductility are expected for concrete under combined FRP-SR confinement, i.e., in FRP-SR confined concrete. Few tests have been performed to investigate the behavior of concrete confined with both transverse steel reinforcement (TSR) and FRP [32][33][34][35][36][37][38][39][40][41][42]. Moreover, most of these tests were conducted to examine the performance of FRP jackets in retrofitting existing reinforced concrete (RC) columns that contained small amounts of TSR, which did not influence the behavior of FRP confined concrete.…”

Section: Introductionmentioning

confidence: 99%

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Compressive Behavior of Concrete Confined with GFRP Tubes and Steel Spirals

et al. 2015

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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 experimental variables. Test results indicate that both GFRP tube and SR confinement remarkably increase the ultimate compressive strength, energy dissipation capacity, and ductility of concrete. The volumetric ratio of SR has a more pronounced influence on the energy dissipation capacity of confined concrete with more GFRP layers. In addition, a stress-strain model is presented to predict the axial compressive behavior of GFRP-SR confined concrete. Comparisons between the analytical results obtained using the proposed model and experimental results are also presented.

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Section: Residual Compressive Behavior Of Confined Concrete After Rupsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Compressive Behavior of Concrete Confined with GFRP Tubes and Steel Spirals

et al. 2015

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“…Many experimental studies reported that external wrapping by FRP composite could remarkably increase the load-carrying ability of circular, square, and rectangular concrete columns [5][6][7]. Different types of FRPs have been used for the lateral confinement of concrete columns, which includes carbon [8][9][10][11][12][13][14], glass [7,[15][16][17][18], aramid [6,[19][20][21], polyethylene napthalate (PEN) [22,23], polyethylene terephthalate (PET) [22][23][24][25][26], and basalt [27][28][29]. These FRP composites are effectively used in enhancing the load-bearing capacity and energy absorption of masonry and reinforced concrete infrastructures.…”

Section: Introductionmentioning

confidence: 99%

Performance of Concrete Confined with a Jute–Polyester Hybrid Fiber Reinforced Polymer Composite: A Novel Strengthening Technique

Wahab

Srinophakun

Hussain³

et al. 2019

Fibers

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The strengthening and rehabilitation of concrete members is an important issue which arises worldwide. Carbon, aramid and glass fiber reinforced polymer (FRP) composites are mainly used for strengthening and rehabilitation. However, its use is limited on a small scale because of its high price, lack of availability and environmental impacts. The solution of this issue gives rise to the use of locally available natural fibers and low-cost synthetic fibers. This paper presents the experimental and analytical results of circular and square concrete columns confined with jute-polyester hybrid FRP composites. The main objective of this study is to evaluate the viability and performance of concrete confined with the hybridization of jute and polyester (FRP) composite sheets to utilize its superior properties. A novel hybrid technique has been applied for the wrapping of fiber sheets. The fiber sheets were applied in such a way that a uniform bond between the inner and outer layer was achieved. A total of 32 plain, standard size circular and square concrete specimens, externally wrapped with a jute-polyester FRP (JPFRP) composite, were tested under monotonic axial compressive loads. The result shows that JPFRP confinement increased the strength, strain and ductility index ranged between 1.24 and 2.61, 1.38 and 8.97, and 4.94 and 26.5 times the un-jacketed specimen, respectively. Furthermore, the wrapping has a significant effect on the low-strength specimens, having a circular cross-section. For high strength specimens, the post-peak stress-strain behavior was dominated by the outer polyester jacket because of its large rupture strain. Additionally, the test results were used to evaluate the existing strength-strain models derived for conventional FRPs. The models predicted values either underestimating or overestimating the compressive strength and strain of JPFRP-confined specimens. However, the strength models performed better than the strain models. The JPFRP wrapping significantly enhanced the strength, fracture energy, ductility index, and post-peak response. Therefore, JPFRP confinement can be used for a small-scale application, where little strength and high ductility is demanded. Moreover, it can be used to prevent the peeling of the concrete cover and moisture penetration into the concrete.

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“…Good bonds are essential for the effectiveness of the composite action between the FRP and the concrete structure. In the case of non bond-critical applications such as confinement, with or without the use of resin [7], bonding is generally not of significance, but the weather durability of the FRP is still a major concern.…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of Epoxy under Accelerated Hygrothermal Conditions

Elarbi

2017

Fibers

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Fibers by themselves have a limited use in engineering applications since they cannot transmit loads from one to another; therefore, the matrix material plays an important role in the overall function of the fiber reinforced polymer (FRP) composites. This paper intends to study the long term strength of epoxy resins subject to accelerated hygrothermal conditions. Such tests are able to predict the weather durability performance of epoxy materials, which is particularly important for many FRP bonded concrete structures. Several sets of epoxy beam specimens have been constructed and exposed to various hygrothermal environments (25 • C, 100 • C, 180 • C and 0% or 100% relative humidity). Specimens were then evaluated at selected thermal cycles by three-point flexural tests. The flexural strength, mid-span deflection, and stiffness, as well as the mode of failure, have been examined in this study.

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Axially Loaded Reinforced Concrete Columns with a Square Section Partially Confined by Light GFRP Straps

Cited by 77 publications

References 43 publications

Compressive Behavior of Concrete Confined with GFRP Tubes and Steel Spirals

Compressive Behavior of Concrete Confined with GFRP Tubes and Steel Spirals

Performance of Concrete Confined with a Jute–Polyester Hybrid Fiber Reinforced Polymer Composite: A Novel Strengthening Technique

Flexural Behavior of Epoxy under Accelerated Hygrothermal Conditions

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