Performance of concrete-filled double-skin circular tubes in compression

Essopjee, Y.; Dundu, M.

doi:10.1016/j.compstruct.2015.08.033

Cited by 84 publications

(54 citation statements)

References 9 publications

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“…This is synonymous with test data reported by [17], where the CFST long column capacity predictions were reported to be highly conservative in nature. However, it is totally in contrast to the reported test data for long column CFDST [19,20,21]. Most governing reason for this variation in the results is due to the low initial imperfection of tested specimens in the present study.…”

Section: Test Resultscontrasting

confidence: 55%

“…This approach has been validated through a large set of experimental data [17] and it is found to be conservative. Recently, few experimental studies were carried out for CFDST long columns [19][20][21] to understand their behaviour and to evaluate the member stability approach as used for CFST. It is found that the present approach over estimates the load carrying capacity.…”

Section: Introductionmentioning

confidence: 99%

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Investigations on global buckling behaviour of concrete-filled double-skinned steel tubular columns

Sulthana

Jayachandran

2018

Proceedings 12th International Conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018

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Concrete-Filled Double-skinned Steel Tubular columns (CFDST) are proved to possess exceptional structural resistance in case of fire and multi-hazard situations. This superior quality of CFDST makes it preferable in long column applications. However, studies on the long column behaviour of CFDST is very few, and their results are not in line with the behaviour of CFST long columns. Whereas, several researches on stub column CFDST shows that, the axial compression behaviour of CFDST is similar to CFST. In this paper, selected results (4 numbers of circular CFDST specimens) from a large test data is presented. Axial compression behaviour of long column CFDST specimens is studied, with non-dimensional slenderness λ around 1.0, and hollowness ratio as the governing parameter for study. Test results namely, axial load carrying capacity, axial deformation and lateral deflection are presented in this paper. Numerical models are also developed and validated with the experimental results, to carry out more parametric studies. Further, the experimental axial capacity values are compared with modified capacity equations from EC4 and AISC. Results show that extended EC4 and AISC equations gives conservative predictions for CFDST column even in the long column range. Moreover, the initial imperfections in the specimen and their corresponding boundary conditions for load application, are found to be governing parameters in long column buckling study.

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Section: Test Resultscontrasting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Investigations on global buckling behaviour of concrete-filled double-skinned steel tubular columns

Sulthana

Jayachandran

2018

Proceedings 12th International Conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018

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“…In this field, it is worth to mention the work developed by Essopjee and Dundu [9] on double-skin circular tube columns (inner steel tube empty) with a thickness combination thick-thin. In total, 32 columns were tested and the nominal compressive strength of the outer ring was 30 MPa.…”

Section: Introductionmentioning

confidence: 99%

Influence of Ultra-high Strength Concrete on Circular Concrete-filled Dual Steel Columns

et al. 2017

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This paper presents the results of an experimental program where the load-bearing capacity at room temperature of 14 slender circular concrete-filled dual steel tubular (CFDST) columns under axial load was analysed. In this study, two specimens were prepared as ordinary concrete-filled steel tubular (CFST) columns to be used as references to evaluate the mechanical contribution of the inner steel tube and its infill in the CFDST columns. In addition, the effect of two types of concrete: normal strength concrete (NSC) and ultra-high strength concrete (UHSC) was assessed. Besides, in order to study the influence of the steel share between the inner and outer tube, different cross-sectional configurations were considered. Since the number of experimental results available in the literature on slender CFDST columns is scarce, this work provides novel results to this research field. The different influence of the steel distribution in the response of the specimens of each series was observed, with no influence in the case of columns with ultra-high strength concrete in the outer ring. Finally, the current provisions of Eurocode 4 for the design of composite columns were assessed by means of the results of these tests, being necessary more test data to extract solid conclusions about their accuracy and reliability.

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“…Authors like Essopjee and Dundu [10] and Wan and Zha [11] reported experimental data on double-skin and double-tube slender columns under axial loads, although the influence of UHSC was not studied yet in these campaigns.…”

Section: Introductionmentioning

confidence: 99%

Ultra-high Strength Concrete on Eccentrically Loaded Slender Circular Concrete-filled Dual Steel Columns

et al. 2017

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This paper presents an experimental study which was undertaken to investigate the effect of ultra-high strength concrete (UHSC) on the mechanical response of concrete-filled dual steel tubular columns (CFDST) subjected to eccentric loads. This campaign is a continuation of a previous program on axially loaded members and consists in testing 12 CFDST specimens and two concrete-filled tubular (CFST) columns which serve as references. The location of the dual-grade concretes (outer ring and inner core) and the steel thicknesses configuration were the parameters analysed. Therefore, in this program, two series can be distinguished: 6 columns with normal strength concrete in their outer rings and, conversely, 6 with ultra-high strength concrete. In addition, two different steel tube thicknesses configurations were considered: columns with thin outer steel tube and thick steel tube (thin-thick); and the opposite pattern (thick-thin). Moreover, the experiments on the CFST columns of reference served to investigate the effect of the extra inner steel tube and its filling in CFDST columns. Since the number of campaigns on eccentrically loaded slender CFDST columns is scarce, the results presented in this work become particularly relevant.The analysis of the results revealed that, for both series, the response of the specimens showed similar trend but the effect of UHSC differed from that observed for axially loaded Ibañez C, Romero ML, Espinos A, Portolés JM, Albero V. Ultra-high strength concrete on eccentrically loaded slender circular concrete-filled dual steel columns. 2017. Structures; 12: 64-74. doi: 10.1016/j.istruc.2017 2 columns. Finally, the experimental data were contrasted to the predictions given by Eurocode 4 for the design of composite columns resulting, in general, in slightly unsafe predictions.

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Performance of concrete-filled double-skin circular tubes in compression

Cited by 84 publications

References 9 publications

Investigations on global buckling behaviour of concrete-filled double-skinned steel tubular columns

Investigations on global buckling behaviour of concrete-filled double-skinned steel tubular columns

Influence of Ultra-high Strength Concrete on Circular Concrete-filled Dual Steel Columns

Ultra-high Strength Concrete on Eccentrically Loaded Slender Circular Concrete-filled Dual Steel Columns

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