Experimental behavior of concrete-filled double-skin steel tubular (CFDST) stub members under axial compression: A comparative review

Vernardos, Stelios; Gantes, Charis J.

doi:10.1016/j.istruc.2019.06.025

Cited by 43 publications

(9 citation statements)

References 44 publications

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“…It has been observed that the effect of inner tube strength and ( Diti) ratio has minor influence on the load carrying capacity of stub CFDST columns due to the less contribution of the inner steel tube in column strength. Local buckling in the outer tube and inner tubes in stub columns, while as global buckling in slender CFDST columns, has been the major cause of failure in these CFDTS columns (Elchalakani et al , 2002; Essopjee and Dundu, 2015; Han et al , 2010; Kato, 1996; Li et al , 2012b; Nakanishi et al , 1999; Vernardos and Gantes, 2019; Wang et al , 2018; Yang et al , 2008; Ye et al , 2018). To remove this inadequacy, thickness of outer tube has been increased while as hollowness ratio, χ has been decreased in previous investigation.…”

Section: Introductionmentioning

confidence: 99%

Behavior of partial-length stiffened and full-length stiffened CFDST columns under axial load

Hassan

Bhat

2023

WJE

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Purpose Concrete-filled double skin tube (CFDST) columns are considered one of the most effective steel-concrete composite sections owing to the higher load carrying capacity as compared to its counterpart concrete-filled tube (CFT) columns. This paper aims to numerically investigate the performance of axially loaded, circular CFDST short columns, with the innovative strengthening technique of providing stiffeners in outer tubes. Circular steel hollow sections have been adopted for inner as well as outer tubes, while varying the length of rectangular steel stiffeners, fixed inside the outer tubes only, to check the effect of stiffeners in partially and full-length stiffened CFDST columns. Design/methodology/approach The behaviour of these CFDST columns is investigated numerically by using a verified finite element analysis (FEA) model from the ABAQUS. The behaviour of 20-unstiffened, 80-partially stiffened and 20-full-length stiffened CFDST columns is studied, while varying the strength of steel (fyo = 250–750 MPa) and concrete (30–90 MPa). Findings The FEA results are verified by comparing them with the previous test results. FEA study has exhibited that, there is a 7%–25% and 39%–49% increase in peak-loads in partially stiffened and full-length stiffened CFDST columns, respectively, compared to unstiffened CFDST columns. Originality/value Enhanced strength has been observed in partially stiffened and full-length stiffened CFDST columns as compared to unstiffened CFDST columns. Also, a significant effect of strength of concrete has not been observed as compared to the strength of steel.

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Section: Introductionmentioning

confidence: 99%

Behavior of partial-length stiffened and full-length stiffened CFDST columns under axial load

Hassan

Bhat

2023

WJE

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“…The findings reveal that when the axial compressive force level is low, the hollow ratio and concrete strength have little effect on the behavior of the test specimens, whereas the axial compressive load level and thickness of outer tubes have a major impact (Zhou et al 2016). By merging rectangular and circular tubes, Hassaneina et al (2018) and Vernardos et al (2019) investigated and researched the many types of double-skin steel tubular. Zheng et al (2018) researched double-tube concrete-filled stainless steel tubular (CFSST) columns with circular outer stainless steel tube and circular inner carbon steel tube under cyclic loads.…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Behavior of Upgraded Concrete-filled Tubular Columns

Barghlame

Ferdousi

Ghasemi

2022

ACT

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Many advantages of concrete-filled steel tube columns have led to their use in a variety of distinctive and important structures in recent years, including high-rise buildings, piers, stairs and other structures. The exterior steel wall of these columns is uncoated, which is the main disadvantage. When these columns are subjected to external pressure on the external steel wall, such as collision, explosion, fire or other accidents, the confinement of concrete will be lost owing to the weakness generated in the steel wall, resulting in an abrupt loss in column strength. In this study, a new upgraded section using internal steel mesh is designed and introduced, with this steel mesh and the external steel wall acting as a double-skin steel tube to protect the concrete core from being destroyed if the external steel wall is destroyed and the column's strength drops suddenly. Under axial and cyclic loads, a comparison of the behavior of this innovative section (with internal steel mesh) with the most commonly used sections of concrete-filled steel columns was conducted. Following the verification of the finite element modeling, various other studies were carried out. The results of the analyses clearly show that the suggested CFT section has increased strength, improved resistance to progressive collapse, and energy absorption capacity under axial and cyclic loading, particularly abrupt loads such as fire or explosion, and thus its use in construction is recommended.

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“…Generally, while the ultimate capacity kept constant, CFDST has wider cross-section and greater flexural stiffness than the conventional concrete-filled steel tube (CFST), as the inner steel tube replaces part of the concrete core for this new type of sections. Moreover, CFDST generally uses less materials, and therefore has lower self-weight, better fire resistance and superior seismic performance compared to the conventional CFST [2][3][4], especially when a higher flexural stiffness is required, such as viaduct piers, mega columns in various bridges, space structures and high-rise buildings, and so on [5,6]. Furthermore, the CFDSTs consist of inner and/or outer stainless steel tubes with a larger internal space can be used as offshore platform legs, submarine pipelines, underground integrated pipeline corridors and cabins, etc.…”

Section: Introductionmentioning

confidence: 99%

“…In order to well assist the engineering practice, researchers have conducted comprehensive studies on the structural behaviour of CFDST members, joints and frames while subjected to different loading cases, such as short-term static loading [5,6,[10][11][12], long-term sustained loads [13], axial and lateral partial compression [14,15], dynamic loading [16][17][18], fire exposure [2,19,20], etc. Moreover, specification or guidelines [4,21] for the design of CFDST structures have also been issued.…”

Section: Introductionmentioning

confidence: 99%