Behavior of CFST short column and beam with initial concrete imperfection: Experiments

Liao, Fei-Yu; Han, Lin‐Hai; He, Shan-Hu

doi:10.1016/j.jcsr.2011.06.009

Cited by 110 publications

(43 citation statements)

References 16 publications

(24 reference statements)

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“…In average, gaps were 1.97-mm and 2.99-mm deep for the specimen filled with the PVC funnel (without pressure) and the metallic device (with pressure), respectively. These observations corroborate previous literature findings regarding initial concrete imperfections due to construction process in circular CFST members (Liao et al [12]). …”

Section: Figuresupporting

confidence: 93%

“…In such cases, high-strength epoxy (Han [6]) or high-strength cement mortar (Gho and Liu [5]) (Jiang et al [10]) was used to fill this longitudinal gap. The gap between steel tube and concrete core has been recognized as a type of initial concrete imperfection in CFST circular members (Liao et al [12]). Circumferential gaps may be caused by the concrete shrinkage and usually appears in vertical elements.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on the flexural behavior of large-scale rectangular concrete-filled steel tubular beams

Flor

Fakury

Caldas

et al. 2017

Rev. IBRACON Estrut. Mater.

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Experimental study on the flexural behavior of largescale rectangular concrete-filled steel tubular beamsEstudo experimental sobre o comportamento à flexão de vigas de aço tubulares retangulares preenchidas com concreto em larga escala Abstract ResumoThis paper presents a series of test results of large-scale rectangular concrete-filled steel tubular (CFST) beams to explore their performance under pure bending. Concrete-filling tests were initially carried out on two beam specimens of 12-m in length to investigate the feasibility of casting horizontally large-scale rectangular tubes. A total of six 6-m long specimens were subjected to flexural test afterward, including four CFST beams and two steel hollow section (SHS) beams for comparison. The test results showed that the rectangular CFST beams behaved in a relatively ductile manner. The concrete infilling enhanced the flexural behavior and performance of the steel tubes. Finally, the rigid-plastic theory showed suitable to predict the moment capacity of CFST compact beams.Keywords: concrete filled steel tube, rectangular section, beam, pure bending, moment capacity.Este artigo apresenta uma série de resultados de ensaios experimentais executados em vigas mistas de aço tubulares retangulares preenchidas com concreto (VMPC) em larga escala para se estudar o comportamento à flexão pura. Inicialmente, foram realizados testes de concretagem em dois protótipos de 12 m de comprimento para se investigar a viabilidade executiva do preenchimento com concreto de tubos de aço retangulares em larga escala posicionados horizontalmente. Na sequência, seis protótipos de 6 m de comprimento foram submetidos ao ensaio de flexão, incluindo quatro VMPC retangulares e duas vigas puramente de aço tubulares retangulares (VA) para comparação. Os resultados dos ensaios mostraram que as VMPC retangulares apresentaram comportamento à flexão relativamente dúctil. O preenchimento de concreto melhorou o comportamento à flexão e o desempenho dos tubos de aço. Finalmente, a teoria rígido-plástica apresentou-se adequada para se estimar a capacidade resistente ao momento fletor de VMPC retangulares compactas.Palavras-chave: tubo de aço preenchido com concreto, seção retangular, viga, flexão pura, capacidade resistente ao momento fletor.

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Section: Figuresupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Experimental study on the flexural behavior of large-scale rectangular concrete-filled steel tubular beams

Flor

Fakury

Caldas

et al. 2017

Rev. IBRACON Estrut. Mater.

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“…Unfortunately, this imperfect bonding can reduce the initial stiffness and elastic strength of CFST columns considerably. The situation can be even worse in case of high-strength CFST columns, see Liao et al (2011). Despite that, research works on composite action in CFST columns are still very limited in literature.…”

Section: Introductionmentioning

confidence: 99%

“…To date, only a few researchers have studied composite action in CFST columns; see e.g. Liao et al (2011), Hajjar et al (1998, Fam et al (2004), Roeder et al (2010). In all of these studies, it has been shown that composite action in CFST columns is not well understood and thus remains as an interesting topic for future research.…”

Section: Introductionmentioning

confidence: 99%

Buckling of Slender Concrete-Filled Steel Tubes with Compliant Interfaces

Schnabl

Planinc

2017

Lat. Am. j. solids struct.

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This paper presents an exact model for studying the global buckling of concrete-filled steel tubular (CFST) columns with compliant interfaces between the concrete core and steel tube. This model is then used to evaluate exact critical buckling loads and modes of CFST columns. The results prove that interface compliance can considerably reduce the critical buckling loads of CFST columns. A good agreement between analytical and experimental buckling loads is obtained if at least one among longitudinal and radial interfacial stiffnesses is high. The parametric study reveals that buckling loads of CFST columns are very much affected by the interfacial stiffness and boundary conditions.

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“…For composite structures, there is often a requirement on the shear force transfer between the concrete and metal (e.g., steel rebars, steel columns). Bond between the dissimilar materials is critical to allow this to occur, and should be checked and monitored during the life-cycle of the structures [1][2]. It was shown that steel imperfections can be significantly reduced using the supporting effect of the in-filled concrete [3] whilst imperfections of concrete caused by not proper manufacturing process and/or its natural shrinking may lead to gap between metal and concrete surfaces of CFST which reduced compressive and flexural behaviour of CFST members [1].…”

Section: Introductionmentioning

confidence: 99%

Measurement and monitoring of gap in concrete-metal structures using microwave sensor technologies

Kharkovsky

Tao

2012

2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings

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This work is in the response of concrete-metal bond problem in structures used in infrastructure engineering such as concrete-filled steel pipes and columns. In this paper the capabilities of near-field microwave waveguide sensors for the purpose of measurement and monitoring of gap between concrete and metal surfaces is demonstrated. It was shown that a microwave dielectric-loaded waveguide sensor provides higher sensitivity to the gap than a conventional open-ended waveguide sensor. The performances of the dielectric-loaded waveguide sensor are studied and optimised.

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Behavior of CFST short column and beam with initial concrete imperfection: Experiments

Cited by 110 publications

References 16 publications

Experimental study on the flexural behavior of large-scale rectangular concrete-filled steel tubular beams

Experimental study on the flexural behavior of large-scale rectangular concrete-filled steel tubular beams

Buckling of Slender Concrete-Filled Steel Tubes with Compliant Interfaces

Measurement and monitoring of gap in concrete-metal structures using microwave sensor technologies

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