Tests on concrete filled double-skin (CHS outer and SHS inner) composite short columns under axial compression

Elchalakani, Mohamed; Zhao, Xiao‐Ling; Grzebieta, Raphael

doi:10.1016/s0263-8231(02)00009-5

Cited by 198 publications

(77 citation statements)

References 12 publications

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“…For circular sections, a regression analysis of steel CHS stub column data 17,18 led to equation (7). The CHS stub column data and regression curve have been plotted in Fig.…”

Section: Relationship Between Deformation Capacity å Lb and Slendernessmentioning

confidence: 99%

The continuous strength method

Gardner

2008

Proceedings of the Institution of Civil Engineers - Structures

177

148

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Many of the principal concepts that underpin current metallic structural design codes were developed on the basis of bilinear (elastic, perfectly-plastic) material behaviour; such material behaviour lends itself to the concept of section classification. The continuous strength method represents an alternative treatment to crosssection classification, which is based on a continuous relationship between slenderness and (inelastic) local buckling and a rational exploitation of strain hardening. The development and application of the continuous strength method to structural steel design is described herein. Materials that exhibit a high degree of nonlinearity and strain hardening, such as aluminium, stainless steel and some high-strength steels, fit less appropriately into the framework of cross-section classification, and generally benefit to a greater extent from the continuous strength method. The method provides better agreement with test results in comparison to existing design codes, and offers increases in member resistance and a reduction in scatter of the prediction. An additional benefit of the proposed approach is that cross-section deformation capacity is explicitly determined in the calculations, thus enabling a more sophisticated and informed assessment of ductility supply and demand. Further developments to the method are under way.

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“…For circular sections, a regression analysis of steel CHS stub column data 17,18 led to equation (7). The CHS stub column data and regression curve have been plotted in Fig.…”

Section: Relationship Between Deformation Capacity å Lb and Slendernessmentioning

confidence: 99%

The continuous strength method

Gardner

2008

Proceedings of the Institution of Civil Engineers - Structures

177

148

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“…In this line, the main contributions can be found in published works [1], [2], [3], [4] and [5]. Thus, Zhao and Grzebieta [1] and Elchalakani et al [4] carried out experimental campaigns on stub columns with SHS-SHS and CHS-SHS respectively. In both campaigns the outer steel tube was thicker than the inner one (thick-thin) and the concrete of the outer ring had a compressive strength of 60-64 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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“…Two strategies can be considered to increase the fire resistance of CFST columns: On one hand the usage of innovative cross-sections like doubleskin and double-tube columns (Zhao et al [5], [6], Han et al [7] or Romero et al [8]), and on the other hand the improvement of the fire resistance by using advanced materials in columns and connections. Nonetheles, in this paper the emphasis is on the materials.…”

Section: Introductionmentioning

confidence: 99%

Advanced materials for concrete-filled tubular columns and connections

et al. 2015

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The advantages of concrete-filled steel tubular (CFST) columns are well known at room and elevated temperatures, however, beyond a certain slenderness their load-bearing capacity starts to decrease. Besides, blind-bolts represent a proper system to allow endplate bolted connections to hollow steel tubular columns and CFST, although the resistance of the bolt shank conditions affects the performance of the connection. In this paper, the use of innovative materials is proposed as a method of enhancing of the load-bearing capacity for both CFST columns and connections. In this line, a first approach of the benefits using high strength steel, fire-resistant steel and geopolymer concrete applied for CFST columns in the fire situation is developed, obtaining better fire results although depending on the columns cross-sections configuration and the part where the advanced material is applied. Related to blind-bolts connections under fire conditions, the use of fire-resistant bolts is assessed. Their higher strength retention in fire could avoid the use of protection, but only in limited cases. Furthermore, a preliminary study on shape memory alloys in the blind-bolts is performed at room temperature and supporting cyclic pull-out loading.

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Tests on concrete filled double-skin (CHS outer and SHS inner) composite short columns under axial compression

Cited by 198 publications

References 12 publications

The continuous strength method

The continuous strength method

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

Advanced materials for concrete-filled tubular columns and connections

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