Structural behavior of concrete filled steel tubular sections (CFT/CFSt) under axial compression

Evirgen, Burak; Tuncan, Ahmet; Taşkin, Kıvanç

doi:10.1016/j.tws.2014.02.022

Cited by 123 publications

(57 citation statements)

References 14 publications

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“…Steel tube performs both longitudinal and lateral reinforcement as well as it is used in formwork. A concrete core resists axial force, at the same time preventing the buckling of steel in an inward direction on a tube [10]. In spite of many advantages of CFST column members, they have some disadvantages.…”

Section: Introductionmentioning

confidence: 99%

“…The more number of carbon fibre wrap usage were enhanced the axial deformation capacity as well as compressive strength [12]. Geometrical shape, compressive strength of concrete and thickness of steel tube have also serious effect on CFST members within the stress -strain characteristics [10]. Fibre reinforced concrete are used to improve of mechanical behaviours of concrete such as ductility, compressive strength, tensile strength and modulus of elasticity.…”

Section: Introductionmentioning

confidence: 99%

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08.57: The friction investigation of CFRP confined CFST specimens with modified concrete

Evirgen

Tuncan

2017

ce papers

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Nowadays, concrete filled steel tube (CFST) composite members have in wide range application areas such as transverse beams, piers, slender columns, stub columns, wind turbines etc. around the world. The frictional behavior between concrete and steel tube has a vital role in selection of required size and materials during the laboratory experiments, in-situ applications and modelling studies. In this study, 16 CFST members were subjected to push out tests within the aim of determination the effect of carbon fibres reinforced polymer (CFRP) confinement and modified concrete at the same time. Modified concrete indicates some mechanical additives are inside the concrete for instance steel fibres, polypropylene fibres and crumb rubber. Furthermore, external CFRP confinement was applied with three different arrangements on the outside circumference of the steel tube. Frictional stress created on the lateral interaction surface ranges between 0.18 MPa and 0.63 MPa due to maximum striping force. Maximum frictional strength was observed on the unconfined reference concrete. Although CFRP application seriously increased the axial strength of composite sections, this process decreases the frictional strength between concrete and steel tube, unexpectedly. Therefore, considering different frictional coefficient emerges as a foregone conclusion during the design procedure of CFRP confined CFST sections.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

08.57: The friction investigation of CFRP confined CFST specimens with modified concrete

Evirgen

Tuncan

2017

ce papers

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“…This is one important reason why it is advantageous to use Composite Columns consisting of Concrete-Filled Steel Tubes (CFST) instead of traditional Reinforced Concrete Columns. BurakEvirgen et al (2014) [2]they investigated the compressive behavior of CFST section considering various cross-sectional shapes like circular, hexagonal, rectangular and square. Experimental study was carried out by varying B/t (Breadth to thickness) ratio and grades of concrete.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Circular and Square Concrete Filled Steel Tube Columns Subjected to Axial Compression Loads

Panchal¹

2016

IJRET

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This paper investigates the behaviour of concentrically axially loaded circular and square high strength steel tube (Fe310 grade) columns filled with different grades (M20, M30 & M40 etc.) of concrete. The effects of grade of concrete and composite action between the steel tube and the concrete core on axial load capacity are studied & graphs of Axial load v/s vertical deflection (axial shortening curves) are plotted experimentally. Some important performance indices entitled as Ductility Index (DI), Strength factor (SI) and Concrete Contribution Ratio(CCR) are also evaluated and compared between the circular and the square shaped Concrete Filled Steel Tube (CFST) columns.By referring many research works, we can know firmly that confinement effect is restricted to short column only. So, we choose 300mm length for all the specimens of 88.9mm dia and 80×80mm size, to keep the columns stub only for getting benefit of confinement effect especially in circular sections.From the results, it has been noted that square columns have higher axial capacity when compared with circular columns of same resisting area under compression. Hence, size reduction for square column is possible. While ductility index for circular columns are quite better than square ones. Ultimate failure patterns are obtained by applying axial compression loads concentrically up to ultimate stage on circular and square CFST stub columns. as expected, the results shows a Local buckling i.e. crushing of concrete type of failure at supports. Ultimate axial load capacity of Concrete filled steel tubular columns are evaluated and compared experimentally as well as by calculations also, as per the guidelines suggested by EC4(Eurocode part-4, British Standards Institutions) code, which is the best suitable code for design of CFST columns amongst all other international codes for composite structure design. From the study it is concluded that, loads obtained by EC4 fits nearer to perfection and depicts the behaviour well enough by 15-20% error with experimental ultimate loads. The results obtained by experimental and EC4 code are validated well with the previous scholar researchers too

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“…The steel tube in CFST section lies at the outer perimeter, which effectively resist tension and bending moments and also increases stiffness of CFST section as steel has a high modulus of elasticity. The inner concrete core of CFST section also plays an important part in delaying the inward buckling of steel tube and improves the behavior of CFST section [4,5]. Steel tube in CFST also provides good confinement to the inner concrete core, which increases the compressive strength of the CFST section [6].…”

Section: Introductionmentioning

confidence: 99%

Performance of Concrete Filled Steel Tube (CFST) Section: A Review

2015

IJSR

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Concrete Filled Steel Tube (CFST) is the composite section formed by filling concrete into a hollow steel tube. The CFST section resists applied load through the composite action of concrete and steel, this advantageous interactive behavior between steel tubes and concrete increases the strength of CFST section and hence it has become popular in recent days and is being used in structures such as bridges, electricity towers, buildings etc. Extensive works carried out on CFST in past years have indicated that the CFST sections possess high ductility, strength and stiffness properties. These properties are considered to be important, especially for the multi-storied buildings required to be erected in earthquake prone areas. Therefore, behaviour of buildings with CFST sections needs to be studied. The present paper reviews various research works carried out by several researchers on CFST sections for investigating the behavior considering parameters such as length to diameter (L/D) ratio, Diameter to thickness (D/t) ratio, thickness of steel tube etc.

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Structural behavior of concrete filled steel tubular sections (CFT/CFSt) under axial compression

Cited by 123 publications

References 14 publications

08.57: The friction investigation of CFRP confined CFST specimens with modified concrete

08.57: The friction investigation of CFRP confined CFST specimens with modified concrete

Experimental Study on Circular and Square Concrete Filled Steel Tube Columns Subjected to Axial Compression Loads

Performance of Concrete Filled Steel Tube (CFST) Section: A Review

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