Effectiveness of Stiffeners in CFDST Columns: Comparative Study

Hassan, Aamir; Bhat, Javed Ahmad

doi:10.1061/ppscfx.sceng-1260

Cited by 3 publications

(2 citation statements)

References 61 publications

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“…Similarly, when these 6-number of Figure 1 Column classifications stiffeners are provided in outer tubes only, up to 26% increase in axial load-carrying capacity has been observed. Furthermore, in these stiffened CFDST columns, a reduction in concrete core strength has been reported (Hassan and Bhat, 2022;Liang et al, 2019;Mohammadbagheri and Shekastehband, 2020;Wang et al, 2020). In circular-circular CFDST slender columns, subjected to axial load, with stiffeners of different shapes (profiles) in the outer tube as well as in the inner tube, a 15% increase in load carrying capacity has been observed (Ghannam and Metwally, 2020).…”

Section: Introductionmentioning

confidence: 93%

“…Externally or internally stiffened, circular-circular CFDST columns, subjected to high temperatures (fire scenario), showed 38% increase in fire resistance/rating (Mohammadbagheri and Shekastehband, 2020). The circularcircular, stiffened CFDST, provided with 6-number of stiffeners, exhibited up to 11% increase in axial load carrying capacity, when stiffeners are provided in inner tubes only (Hassan and Bhat, 2022). Similarly, when these 6-number of Figure 1 Column classifications stiffeners are provided in outer tubes only, up to 26% increase in axial load-carrying capacity has been observed.…”

Section: Introductionmentioning

confidence: 99%

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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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