Compressive Performances of the Concrete Filled Circular CFRP-Steel Tube (C-CFRP-Cfst)

Che, Yong; Wang, Q. L.

doi:10.18057/ijasc.2012.8.4.2

Cited by 14 publications

(21 citation statements)

References 15 publications

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“…In the research work on CFST (Han [17]), the confinement of steel tube to concrete is represented by a confinement factor of the steel tube ( s  ). Similarly, the confinement of the transverse CFRP can be also represented by a confinement factor of the transverse CFRP ( cf  ) (Che, Wang and Shao [15]), and the strengthening efficiency of longitudinal CFRP may be represented by a strengthening factor of the longitudinal CFRP ( ). The definitions of all the confinement or strengthening factors are listed as follows:…”

Section: Stiffnessmentioning

confidence: 99%

“…The convergent analysis is carried out by using refined mesh in finite element analysis, and the details can be referred to relative research (Che, Wang and Shao [15]). Figure 14 shows the FE mesh of a typical model.…”

Section: Mesh Discritizationmentioning

confidence: 99%

“…A new CFST column system with circular cross-section, where CFRP materials were used as additional confinement to the potential plastic hinge regions of the composite column, was proposed (Xiao, He and Choi [13]), and a simplified analytical solution in association with a numerical computer program of the CF-CFRP-ST column was developed (Choi and Xiao [14]). Additionally, a systematic study on Circular CF-CFRP-ST (denoted by C-CF-CFRP-ST) stub columns has been carried out (Che, Wang and Shao [15]). The constitutive relationship of concrete confined by circular CFRP-steel tube under compression as well as the index of load carrying capacity of the axially compressed C-CF-CFRP-ST stub columns was presented.…”

Section: Introductionmentioning

confidence: 99%

“…), the total confinement coefficient ( ) (Che, Wang and Shao [15]) and the index of axial compressive load carrying capacity …”

mentioning

confidence: 99%

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Flexural Performance of Circular Concrete Filled CFRP-Steel Tubes

Shao¹,

Wang²

2015

Volume 11 Number 2

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Sixteen circular concrete filled CFRP-steel tubular (C-CF-CFRP-ST) flexural members were tested. The test results indicate that the moment versus curvature curve at mid-span of C-CF-CFRP-ST members without longitudinal CFRP reinforcement is similar to such relationship of corresponding un-reinforced circular concrete filled steel tubular (C-CFST) flexural members. The moment versus curvature curve at mid-span for members with longitudinal CFRP reinforcement can be divided into following stages: elastic stage, elasto-plastic stage and softening stage. The longitudinal CFRP can enhance the stiffness of the specimens significantly. The steel tube and the CFRP tube could cooperate both in the transverse and in the longitudinal directions. The steel tube in the region under longitudinal tension has no confinement effect on the core concrete in the same tensile region because the concrete is in a state of contraction in transverse direction. The longitudinal strain distribution over depth of the specimens' cross-section satisfies the plane section assumption approximately. Finite element model is built and ABAQUS is used to analyze both the moment versus curvature curves at mid-span and the deformation of the C-CF-CFRP-ST flexural members. The finite element results are found to agree well with experimental results. Interaction forces exist both in the tensile region and in the compressive region between the outer tube and the concrete. However, there is essential difference between the interaction forces in the tensile region and in the compressive region respectively. Finally, flexural load carrying capacity of the C-CF-CFRP-ST is defined, and parametric equations for calculating it are presented. The accuracy and the reliability of the proposed equations are verified.

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Section: Stiffnessmentioning

confidence: 99%

Section: Mesh Discritizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…), the total confinement coefficient ( ) (Che, Wang and Shao [15]) and the index of axial compressive load carrying capacity …”

mentioning

confidence: 99%

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Flexural Performance of Circular Concrete Filled CFRP-Steel Tubes

Shao¹,

Wang²

2015

Volume 11 Number 2

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“…However, steel tubes are susceptible to degradation due to corrosion and its thin-walled section before concrete hardening [8], which results in the decrease of axial strength of the CFST column [9]. erefore, the CFRP-metal tube can also be used in civil engineering, for example, the CFRP-steel composite tube infilled with concrete has been used as the column [10], and CFRP has also been used to reinforce damaged CFST column [11]. As discussed by Gu [12], Li et al [13], and Wang et al [14], most of the research conducted has focused on the use CFRP for CFST structure.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of CFRP‐Confined CFST Stub Columns under Axial Compression

Guo

Zhang

2018

Advances in Civil Engineering

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is paper presented a comparative study of concrete-filled steel tubular (CFST) stub columns with three different confinement types from carbon fiber reinforced polymer (CFRP): outer circular CFRP, inner circular CFRP, and outer square CFRP. e compressive mechanism and physical properties of the composite column were analyzed firstly aiming at investigating the confinement effect of CFRP. Ultimate axial bearing capacity of these three CFRP-confined CFST columns was calculated based on Unified eory of CFSTand elastoplastic limit equilibrium theory, respectively. Meanwhile, the corresponding tests are adopted to validate the feasibility of the two calculation models. rough data analysis, the study confirmed the ultimate strength calculation results of the limit equilibrium method were found to be more reliable and approximate to the test results than those of Unified eory of CFST. en axial bearing capacity of the pure CFSTcolumn was predicted to evaluate the bearing capacity enhancement ratio of the three types of composite columns. It was demonstrated that the averaged enhancement ratio is 16.4 percent, showing that CFRP-confined CFST columns had a broad engineering applicability. rough a comparative analysis, this study also confirmed that outer circular CFRP had the best confinement effect and outer square CFRP did better than inner circular CFRP. e confinement effect of CFRP increased with the decrease of concrete strength, and it was proportional with relative proportions of CFRP and steel under the same concrete strength.

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Numerical and machine learning models for concentrically and eccentrically loaded CFST columns confined with FRP wraps

Xu,

Zhang,

Isleem

et al. 2024

Structural Concrete

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Previous research largely concentrated on predicting load‐carrying capacities of concrete‐filled steel tubes (CFST) confined with fiber‐reinforced polymer (FRP) wraps under pure concentric loads, neglecting the more complex failure mechanisms that occur under real‐life eccentric loading conditions. This study, therefore, employs both finite element modeling (FEM) and machine learning methods to accurately predict the load‐bearing capacities under both concentric and eccentric loading conditions. This research analyzed a comprehensive dataset comprising 128 experimental tests and an equivalent number of FEM simulations designed to evaluate their eccentric performance. These models have been thoroughly generated and validated against existing literature. Additionally, the developed ML models, particularly a hybrid deep learning model, demonstrated significant predictive accuracy, with an average R2 value of 0.969 across all model folds. Partial dependence analysis further highlighted the significant influence of concrete strength and the interactive effects of steel tube area and FRP wrap thickness on the load‐carrying capacity of the columns. Furthermore, to enhance cost‐efficiency and resource management compared with traditional laboratory testing, a user‐friendly graphical user interface (GUI) has been developed and hosted on an open‐source platform such as GitHub. This interface supports real‐time, precise predictive capabilities and promotes a collaborative environment for ongoing model refinement and improvement.

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Compressive Performances of the Concrete Filled Circular CFRP-Steel Tube (C-CFRP-Cfst)

Cited by 14 publications

References 15 publications

Flexural Performance of Circular Concrete Filled CFRP-Steel Tubes

Flexural Performance of Circular Concrete Filled CFRP-Steel Tubes

Comparative Study of CFRP‐Confined CFST Stub Columns under Axial Compression

Numerical and machine learning models for concentrically and eccentrically loaded CFST columns confined with FRP wraps

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