Simplified Design Model for Uni-Axially Loaded Double-Skinned Concrete-Filled-Steel-Tubular Columns With External Confinement

Ho, J.C.M.; Dong, C.X.

doi:10.18057/ijasc.2014.10.2.4

Cited by 2 publications

(3 citation statements)

References 54 publications

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“…The empirical formulas to check the ultimate capacity were suggested. This suggested relation can predict the strength of CFDST and can be useful for structural designers (Dong and Ho, 2015; Ho and Dong, 2014). Further, various studies were conducted on stiffened CFDST columns’ behavior under axial concentric and eccentric compressive forces.…”

Section: Introductionmentioning

confidence: 98%

Axial compression behaviour of concrete filled double skin steel tube columns anchored with orbicular rings: Experimental and numerical approach

Singh,

Tiwary

2023

Advances in Structural Engineering

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Double-skin tube column sections have been used extensively in recent years. These sections are composed of two adjacent, coaxially spaced steel casings, and the space in the middle of them is occupied with concrete. These CFDST columns behave similarly to CFST sections but are more rigid and have a lesser self-weight. The behavior of a novel type of CFDST column, the orbicular anchored CFDST column, was assessed under axial compression in the current research. It comprises an inside and an outside steel tube with orbicular rings near the ends of the columns. The orbicular rings were positioned at various spots such as [Formula: see text] and [Formula: see text] and a wide range of tests were accomplished to evaluate the functionality of orbicular anchored CFDST columns in respect of maximum load-bearing capability, load-strain behavior, and load-deformation behavior. A FE model was developed and its accuracy was authenticated by comparing its findings with experimental results. Furthermore, a parametric investigation was carried out employing the authenticated FE model to examine the functioning of the proposed CFDST to variations in orbicular position, cross-sectional dimensions of rings, yield strength of orbicular ring, etc. The outcomes of the study indicated that orbicular anchored CFDST columns had 15% higher ultimate load capacity than unstiffened counterparts. The orbicular anchorage improved the ductile response and increased the axial stiffness of the CFDST column. Further, it was concluded that orbicular rings enhanced the constraining effect of external steel casing on sandwiched concrete and improved the composite action of CFDST specimens. The design formula to ascertain the load-bearing ability of columns was also developed and can be employed amid preliminary designs of proposed column sections.

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Section: Introductionmentioning

confidence: 98%

Axial compression behaviour of concrete filled double skin steel tube columns anchored with orbicular rings: Experimental and numerical approach

Singh,

Tiwary

2023

Advances in Structural Engineering

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“…Ho and Dong suggested a simplified design formula for axial strength determination of CFDST specimen with external ring confinement. 26 The proposed equation was,…”

Section: Introductionmentioning

confidence: 99%

“…With increase in FRP thickness, enhanced the maximum axial stress and strain of confined concrete. Ho and Dong suggested a simplified design formula for axial strength determination of CFDST specimen with external ring confinement 26 . The proposed equation was,

N_{p}^{'} = A f_{c}^{'} A_{c} + B f_{italicyo} A_{italicso} + C f_{italicyi} A_{italicsi}

, to estimate the strength of CFDST column subjected to uniaxial loading and is useful for structural designers.…”

Section: Introductionmentioning

confidence: 99%

Influence of anchored orbicular rings on the performance of sandwich concrete‐filled double‐skin steel tube columns

Singh,

Tiwary

2023

Structural Concrete

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Since recent years, double‐skin tube column sections formed from two parallel, concentrically spaced steel casings, with the sandwiched area between the casings packed with concrete infill, have been employed extensively. The cross‐sectional shapes of the inner and outer casings might be the same or different, such as round, square, octagonal, etc. These concrete‐filled double‐skin steel tubular (CFDST) columns act similarly to concrete‐filled steel tubular (CFST) sections but have less self‐weight and better stiffness. The present study evaluated the response of CFDST column stiffened with orbicular rings under axial compression. It consists of inner and outer steel tubes stiffened by orbicular rings near both ends of columns. The orbicular rings were provided at different locations as L/3, L/4, and L/5, and a series of tests were conducted to obtain the performance of CFDST columns stiffened with orbicular rings with regard to the maximum load‐carrying capacity, load–strain behavior, and load‐deformation behavior. Furthermore, a parametric study was conducted by varying the diameter to thickness ratio, hollowness ratio, the thickness of orbicular rings, yield strength, and location of orbicular rings. The results showed that CFDST column stiffened with orbicular rings have higher ultimate load capacity than unstiffened CFDST. Stiffened CFDST with orbicular rings showed more ductile response than CFDST column and helps to improve the outer steel tube's restraint on sandwiched concrete. In order to estimate the load‐bearing capacity of CFDST columns stiffened with orbicular rings under axial compression, an empirical equation was proposed. The experimental results and findings of the suggested equations were found to be in good agreement.

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Simplified Design Model for Uni-Axially Loaded Double-Skinned Concrete-Filled-Steel-Tubular Columns With External Confinement

Cited by 2 publications

References 54 publications

Axial compression behaviour of concrete filled double skin steel tube columns anchored with orbicular rings: Experimental and numerical approach

Axial compression behaviour of concrete filled double skin steel tube columns anchored with orbicular rings: Experimental and numerical approach

Influence of anchored orbicular rings on the performance of sandwich concrete‐filled double‐skin steel tube columns

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