Axial Loading Behavior of CFRP Strengthened Concrete-Filled Steel Tubular Stub Columns

Tao, Zhong; Han, Lin‐Hai; Zhuang, Jinping

doi:10.1260/136943307780150814

Cited by 205 publications

(67 citation statements)

References 8 publications

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“…The comparisons are shown in Table 4. As can be seen, Equation (7) can be used to accurately predict the ultimate strength of the specimens from Tao et al [9], Hu et al [7] and Gu et al [29], but overestimates the ultimate strength of the specimens from Xiao et al [6]. The reason may be attributed to the fact that these specimens have relative high ξ f .…”

Section: Prediction Of Load Capacitymentioning

confidence: 99%

“…A mean ratio (N u /N up ) of 1.025 with a standard deviation of 0.026 is obtained. Equation (7) is also used to analyze the test results reported by Xiao et al [6], Tao et al [9], Hu et al [7] and Gu et al [29]. The comparisons are shown in Table 4.…”

Section: Prediction Of Load Capacitymentioning

confidence: 99%

“…The results showed that the external bonding of CFRP not only provided additional confinement pressure to the concrete core, but also constrained the local buckling of the steel tube. Tao et al [9] studied the compressive behavior of FCCFST columns with a circular and rectangular cross-section. In the circular columns, when the number of the CFRP layers increased, the load capacity increased, but the ductility decreased.…”

Section: Introductionmentioning

confidence: 99%

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Behavior of FRP-Confined Concrete-Filled Steel Tube Columns

2014

Polymers

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This paper presents the results of an experimental study into the behavior of concrete-filled steel tube columns confined by fiber-reinforced polymer (FRP). Eleven columns were tested to investigate the effects of the FRP layer number, the thickness of the steel tube and concrete strength on their load capacity and axial deformation capacity. The experimental results indicated that the FRP wrap can effectively confine the concrete expansion and delay the local buckling of the steel tube. Both the load capacity and the axial deformation capacity of concrete-filled steel tube columns can be substantially enhanced with FRP confinement. A model is proposed to predict the load capacity of the FRP-confined concrete-filled steel tube columns. The predicted results are generally in good agreement with the experimental ones obtained in this study and in the literature.

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Section: Prediction Of Load Capacitymentioning

confidence: 99%

Section: Prediction Of Load Capacitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Behavior of FRP-Confined Concrete-Filled Steel Tube Columns

2014

Polymers

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“…Recent study shows that CF-CFRP-ST has satisfactory fire endurance time when adequate fire resistant measures have been taken (Tao et al [21]). There are many research studies about CF-CFRP-ST structures in the literature, and these studies mostly focus on Circular CF-CFRP-ST (C-CF-CFRP-ST) stub columns (Xiao et al [22]; Choi and Xiao [23]; Park et al [24]; Hu et al [25]; Li et al [26]; Teng et al [27]), C-CF-CFRP-ST flexural members (Wang and Shao [28]), Square CF-CFRP-ST (S-CF-CFRP-ST) stub columns (Tao et al [29]; Park et al [30]; Sundarraja and Ganesh [31]; Sundarraja and Ganesh [32]; Sundarraja and Ganesh [33]; Wang and Shao [34]) and S-CF-CFRP-ST flexural members (Sundarraja and Ganesh [35]; Wang et al [36]). More applications in practical engineering are columns with large slenderness ratio (as shown in Figure 2) although corresponding research is quite scarce.…”

Section: Introductionmentioning

confidence: 99%

Static Behavior of Axially Compressed Circular Concrete Filled CFRP-Steel Tubular (C-Cf-CFRP-St) Columns With Moderate Slenderness Ratio

Wang¹,

Qu²,

Shao³

et al. 2016

Volume 12 Number 3

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Thirty-two specimens are experimentally tested in this paper to study the static performance of axially compressed circular concrete filled CFRP-steel tubular (C-CF-CFRP-ST) columns. The tested results indicate that, for columns with relative small slenderness ratio, failure is dominated by the strength loss of the materials. However, for columns with relative large slenderness ratio, failure is controlled by instability. The load versus deflection curves at the mid-height of the composite column can be divided into three stages, i.e., elastic, elasto-plastic and softening stage. Analyses of the tested results show that distribution of longitudinal strains in the steel tube over depth on the cross-section is approximately linear, and the steel tube and its outer CFRP material can cooperate both longitudinally and transversely. The longitudinal strain and the transverse strain at a point have opposite signs, and the steel tube under longitudinal tension has no transverse confinement effect on its concrete. The Deformed modes of the columns, the axial load verses deflection curves at the mid-height, the axial load verses axial shortening curves and the stresses in the steel tube are simulated by using finite element method. The calculated results agree well with the experimental results to prove the accuracy of the finite element model. Stresses in the concrete, the steel tube and the CFRPs are analyzed by using finite element method. The numerical results show that the interaction force between the steel tube and the concrete decreases gradually from compressive region to tensile region. The adhesive strength between the concrete and the steel tube has little effect on the critical buckling load and on the elastic stiffness of the columns. Equation for calculating the critical buckling load of the composite columns is presented, and the estimated results agree well with the experimental results.

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“…The load capacity enhancement increased with increasing diameter-to-thickness ratio. Tae et al [6] also carried out tests on concrete-fi lled steel hollow short columns strengthened by CFRP. They found that more research is needed to investigate the effect of number of layers, the fi bre orientation, and the gap between CFRP and steel on the behaviour and strength.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Corroded Hss Tubular Members under Compression Strengthened with CFRP Composites

Sundarraja¹,

Sriram²

2014

Archives of Civil Engineering

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The main objective of this investigation is to assess the feasibility of strengthening of corroded (damaged) square hollow steel tubular sections subjected to compression and to develop or predict the suitable wrapping scheme of fi bre reinforced polymer (FRP) to enhance the structural behaviour of it. For this study, compact mild steel tubes were used with the main variable being FRP characteristics. Carbon fi bre reinforced polymer (CFRP) fabrics was used as horizontal strips (lateral ties) with other parameters such as the number of layers and spacing of strips. Among fourteen specimens, six were externally bonded by CFRP strips having a constant width of 50mm with a spacing of 20mm and the remaining six were externally bonded by CFRP strips having a constant width of 70mm with a spacing of 20mm, two columns were unbonded. Experiments were undertaken until the failure of columns to fully understand the infl uence of FRP characteristics on the compressive behaviour of the square sections including their failure modes, axial stress-strain behaviour, enhancement in the load carrying capapcity, and effect of distribution of CFRP layers. Finally, the behaviour of externally bonded hollow tubular sections was compared with one another and also with the control specimens. Evaluation of the results will lead to optimum CFRP jacketing/ wrapping arrangements for the steel tubes considered here.

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Axial Loading Behavior of CFRP Strengthened Concrete-Filled Steel Tubular Stub Columns

Cited by 205 publications

References 8 publications

Behavior of FRP-Confined Concrete-Filled Steel Tube Columns

Behavior of FRP-Confined Concrete-Filled Steel Tube Columns

Static Behavior of Axially Compressed Circular Concrete Filled CFRP-Steel Tubular (C-Cf-CFRP-St) Columns With Moderate Slenderness Ratio

Investigation on Corroded Hss Tubular Members under Compression Strengthened with CFRP Composites

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