Flexural behaviour of concrete-filled steel tubes

Han, Lin‐Hai

doi:10.1016/j.jcsr.2003.08.009

Cited by 262 publications

(113 citation statements)

References 18 publications

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“…When the applied load is about 60% of the estimated flexural load carrying capacity, the magnitude of the loading step reduces. The estimated flexural load carrying capacity is obtained by the following method: the transverse and the longitudinal CFRPs are transferred to equivalent steel tube, and then the flexural load carrying capacity can be calculated by using corresponding equations of C-CFST flexural members (Han [16]). However, the equivalent steel tube besides longitudinal CFRP is not considered in calculating the confinement factor of the steel tube ( s  ) (Han [17]).…”

Section: Test Setup and Instrumentationmentioning

confidence: 99%

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: Test Setup and Instrumentationmentioning

confidence: 99%

Flexural Performance of Circular Concrete Filled CFRP-Steel Tubes

Shao¹,

Wang²

2015

Volume 11 Number 2

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“…The stiffness after cracking was mainly governed by the laminate structure of the tube and the diameter-to-thickness ratio. Han [11] conducted a series of tests on the flexural behaviour of CFSHS beams. The parameters varied in these tests were depth to width ratio from 1 to 2 and tube depth to wall thickness ratio from 20 to 50.…”

Section: Previous Researchmentioning

confidence: 99%

Flexural Behaviour of SFRC in-Filled Light Gauge Steel Rectangular Box Sections

Selvan¹,

Nagamani²,

Chandrasekaran³

2007

Volume 3 Number 4

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This paper presents an experimental study on the flexural behaviour of plain cement concrete (PCC) and steel fiber reinforced concrete (SFRC) in-filled light gauge steel rectangular box sections under pure bending. Concrete in-fill provides internal support to the section and delays local buckling. It also contributes to the inertia of the section which increases the flexural strength and stiffness of the member. A reference hollow beam, plain concrete in-filled and SFRC in-filled (with three different volume fraction of fibers) beams are tested up to failure in pure bending with respect to their principal axes. Extensive strain and deformation measurements are taken at compression and tension zones. It is found that the SFRC in-filled sections take more load than hollow and plain concrete in-filled beams when it is subjected to loads about their major and minor axes. In this experimental study, it is observed that SFRC in-filled beams with 1% volume fraction of fibers have enhanced structural properties much more than other types of beams. The moment -strain plots show, a good ductility performance by the hollow and SFRC in-filled beams compared to the plain concrete in-filled beams. A comparison of the observed moment capacities and flexural stiffnesses is made, with the values calculated using the expressions recommended by the various codes of practice such as AIJ, BS 5400, Eurocode 4 & LRFD. It was found that the values predicted by the AIJ code agree reasonably well with the experimental results. The codes developed for ordinary cement concrete in-filled beams require modifications when they are applied to high performance concretes such as SFRC in-filled composite beams.Keywords: Hollow; PCC and SFRC in-filled beams; pure bending; flexural stiffness; flexural strength; ductility INTRODUCTIONHybrid structures such as concrete-filled or Steel Fiber Reinforced Concrete (SFRC) in-filled steel hollow sections are very effective in special types of applications such as piles, poles, highway overhead sign structures, bridge components, etc. Concrete-filled steel hollow section (CFSHS) columns are widely used in the construction industry for the past few years owing to the advantages of combining two materials. The steel hollow sections in-filled with concrete have higher strength and greater stiffness than the conventional structural steel sections and reinforced concrete sections. Concrete being a brittle material, has low tensile strength and low ductility. Steel fiber reinforced concrete, a two phase composite material, having randomly distributed steel fibers, has higher resistance against cracking, improved strength in shear, tension, compression and flexure with better toughness and ductility as compared to plain concrete. The addition of randomly distributed fibers improves many properties of concrete such as fracture strength, toughness, impact resistance, flexural strength and fatigue resistance. Both ductility and structural performance factors depend on the structural form selected and the m...

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“…Additional advantages of this type of CFST column system include (i) construction efficiency due to the elimination of formwork, besides the reduction in manpower, construction cost and construction time, (ii) fire resistance improved by the infilled concrete, and (iii) reduced environmental impact by omitting the formwork. Over the last decades, some studies have been carried out on the flexural behavior of CFST members under pure bending (Lu and Kennedy [3]) (Elchalakani et al [4]) (Gho and Liu [5]) (Han [6]) (Han et al [7]) (Lu et al [8]) (Moon et al [9]) (Jiang et al [10]) (Wang et al [11]). The studies demonstrated the increase in ductility and showed the enhancement in flexural capacity of the composite beams over that of steel hollow sections.…”

Section: Introductionmentioning

confidence: 99%

“…Few researchers reported a very small amount of longitudinal shrinkage at the top of the specimens during curing. 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]).…”

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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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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Flexural behaviour of concrete-filled steel tubes

Cited by 262 publications

References 18 publications

Flexural Performance of Circular Concrete Filled CFRP-Steel Tubes

Flexural Performance of Circular Concrete Filled CFRP-Steel Tubes

Flexural Behaviour of SFRC in-Filled Light Gauge Steel Rectangular Box Sections

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

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