CFDST stub columns having outer circular and inner square sections under compression

Uenaka, Kojiro

doi:10.1016/j.jcsr.2015.12.005

Cited by 43 publications

(6 citation statements)

References 20 publications

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“…Farahi et al (2016) have pointed out that the use of corrugated polygonal steel sheets in the inner wall (cross-sectional shape of the inner wall) of CFDST columns leads to a relative increase in the ultimate bearing capacity of this type of column due to the increase in the contact area between concrete and steel. Uenaka et al (2016) conducted a comprehensive investigation of the structural performance of columns with round outer skin and square inner skin made of CFDST material. The results showed that specimens with a higher steel content had higher strength but lower ductility.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Behavior of Concrete-Filled Double Steel Tubular Column with New Reinforced Circular Cross-Section

Faramarzzadeh,

Ferdousi,

Zandi

2024

Preprint

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The concrete-filled double tubular steel column (CFDST) is a composite column that shows remarkable potential for the construction of tall buildings and bridge piers. When this type of column is exposed to external forces such as collisions with ships or cargo vehicles, explosions or fires, it loses strength. The outer steel tube of the column is affected, resulting in the loss of the concrete inclusion between the two layers of steel. As a consequence, a significant drop in column strength becomes evident. The aim of this study is to investigate the effects of cyclic loading on CFDST columns with a new reinforced circular cross-section, which have a constant number of stiffeners and stirrups over the entire column. Two specimens were subjected to constant axial compression and lateral cyclic loading to compare the behavior of a proposed reinforced cross-section (new reinforced cross-section) with that of a simple cross-section. The data from the test was used to validate a finite element analysis (FEA). Subsequently, the validated numerical models were used to evaluate the effects of various parameters, including the thickness of the pipes and the compressive strength of the concrete, on both cross-sections. In summary, the results show a significant improvement in the cyclic behavior of the column with a reinforced cross-section compared to a simple cross-section. The recommended reinforced cross-section thus prevents a sudden drop in column strength after the outer steel tube has been damaged.

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Section: Introductionmentioning

confidence: 99%

Cyclic Behavior of Concrete-Filled Double Steel Tubular Column with New Reinforced Circular Cross-Section

Faramarzzadeh,

Ferdousi,

Zandi

2024

Preprint

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“…Huang et al (2010) investigated CFDST stub columns with square hollow sections (SHS) (square hollow section) or circular hollow sections (CHS) (circular hollow section) outer tube and CHS inner tube and presented typical curves of average stress versus longitudinal strain. Uenaka (2016) and Zhao and Grzebieta (2002) studied the failure mode of CFDST columns by varying the diameter to thickness ratio of inner and outer steel tubes. Yan and Zhao (2020) investigated the behavior of axially loaded circular CFDST stub columns.…”

Section: Introductionmentioning

confidence: 99%

Axial compression performance of concrete filled double skin (SHS outer and CHS inner) steel tubular columns strengthened by CFRP

Wan

Wang

Liang

et al. 2023

Advances in Structural Engineering

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This paper reports the compressive behavior of concrete-filled double skin steel tubular (CFDST) columns strengthened by CFRP under axial loading. The outer skin was made of square hollow sections (SHS), while the inner skin was made of circular hollow sections (CHS). Twelve CFDST columns strengthened by CFRP and three CFDST columns were tested. The failure mode, load-displacement relationship, axial load-carrying capacity and initial stiffness are given and analyzed. The results showed that the CFDST columns strengthened by CFRP have better mechanical properties than the column without CFRP reinforcement (i.e. the CFDST columns). The CFDST columns strengthened by CFRP eventually failed due to CFRP rupture or buckling of the external steel tube near the end and cracked concrete damage from the outer steel tube. The stiffness and axial load bearing capacity of the column can be improved as the number of CFRP layers increases. A simplified design formula of CFDST columns strengthened by CFRP is proposed, which is in good agreement with the experimental results.

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“…Guo et al [11] experimentally investigated the strength and deformation of concrete-lled double steel tube (CFDST) column specimens as in uenced by eccentricity, concrete strength and section hollow ratio. In addition, studies on the sectional shape parameters of the inner and outer tubes have been carried out by some scholars [12][13].…”

Section: Introductionmentioning

confidence: 99%

Axial compression performance of concrete filled double skin (SHS outer and SHS inner) steel tubular columns confined by CFRP

Wang

Liang

et al. 2023

Preprint

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This paper focuses on the axial compression performance of 15 concrete filled double skin tubes CFDST columns by the different CFRP reinforcement schemes. The design of this test used an outer square steel tube with a square steel tube inside and concrete poured at the sandwich and the inner steel tube kept in hollow. Firstly, the damage mechanisms of the specimens were observed and analysed. Secondly, the mechanical properties of the specimens were further analysed from the data of load displacement, peak load and ultimate displacement. The data analysis was mainly used to compare the different axial compressive properties of CFDST columns wrapped with CFRP sheet and those without CFRP sheet. Finally, by referring to the previous model on CFRP-CFST, a modification was made and a computational model of a CFRP-confined CFDST column was developed, which was found to be in good agreement with the experimental results by comparison.

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CFDST stub columns having outer circular and inner square sections under compression

Cited by 43 publications

References 20 publications

Cyclic Behavior of Concrete-Filled Double Steel Tubular Column with New Reinforced Circular Cross-Section

Cyclic Behavior of Concrete-Filled Double Steel Tubular Column with New Reinforced Circular Cross-Section

Axial compression performance of concrete filled double skin (SHS outer and CHS inner) steel tubular columns strengthened by CFRP

Axial compression performance of concrete filled double skin (SHS outer and SHS inner) steel tubular columns confined by CFRP

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