Concrete-filled cold-formed steel (CF-CFS) built-up columns under compression: Test and design

Rahnavard, Rohola; Craveiro, Hélder D.; Lopes, M. Fatima Rosa; Simões, Rui; Laím, Luís; Rebelo, Carlos

doi:10.1016/j.tws.2022.109603

Cited by 49 publications

(31 citation statements)

References 49 publications

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“…CFSTs with regular cross-sections, such as circular, square and rectangular shapes, have been widely investigated [4], yet some research has been conducted on other cross-sectional shapes, for example, Chang et al [5] conducted an experimental and numerical study to investigate the static axial performance of stiffened concrete-filled double-skin steel tubular (CFDST) stub columns with circular and square shapes. In addition, Rahnavard et al [6,7] conducted experimental and numerical analysis on four different cross-section shapes of fabricated concrete-filled cold-formed steel (CF-CFS) short and long columns. For both long and short columns, it was found that the ultimate strengths of the concrete-filled columns were higher than that of hollow columns.…”

Section: Introductionmentioning

confidence: 99%

Design Model of Rectangular Concrete-Filled Steel Tubular Stub Columns under Axial Compression

et al. 2023

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This research collected and summarized a total of 455 experimental tests of axially loaded square and rectangular concrete-filled steel tubular (CFST) stub columns. The recently published papers were used to evaluate the current design equations from four international standards, namely the American Concrete Institute (ACI) code, British Standard (BS5400), Chinese standard (BDJ13-51), and Eurocode 4 (EC4). It was found that the results obtained from the codes have appreciable differences and could be improved, especially for the specimens fabricated using high-resistance materials. Therefore, new empirical equations were proposed based on the four standard formulas and the wide range of previously available experimental data to provide more accurate estimations. The proposed equations could predict an average sectional capacity of only 0.1% lower than the experimental results, with better data scattering than the existing equation’s results.

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Section: Introductionmentioning

confidence: 99%

Design Model of Rectangular Concrete-Filled Steel Tubular Stub Columns under Axial Compression

et al. 2023

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“…Research on CFST utilising the lightweight CFS sections and lightweight concrete has been getting limited attention. Recently, Rahnavard et al [12] and Rahnavard et al [13] tested lightweight concrete-filled built-up columns composed of the combinations of four press-braked sections in U-, Cand Σ-shaped. Their test results showed EC4 [14] provided non-conservative predictions for columns with 1.05 m, however, the predictions became conservative when supplemented with effective formulation from EC3 [15]; whilst for columns with 3 m length, they found that EC4 [14] with effective width formulations from EC3 [15] yielded close agreement in predicting the axial capacity for square specimens whereas they recommended adopting buckling curve c from EC4 [14] for rectangular specimens to represent the imperfection factor.…”

Section: Introductionmentioning

confidence: 99%

Effects of section slenderness and concrete strength on the cross‐sectional behaviour of lightweight concrete‐filled cold‐formed built‐up box sections

Teoh,

Chua

2023

ce papers

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This paper concerns axial compressive behaviour of lightweight concrete‐filled cold‐formed built‐up box sections (CFBBS) at cross‐sectional level. A total of twenty‐four lightweight concrete‐filled CFBBS stub columns and their hollow counterparts—formed by nesting two asymmetric lipped channel sections front‐to‐front—were tested. The varying parameters in the present experimental study included three cross‐section slenderness (h/t) ranging from 75 to 125 and three concrete grades (fc) with measured cylinder strengths varying from 33.5 to 55.6 MPa. The typical mechanical behaviour of the stub column tests was discussed in terms of load‐end shortening response. The parametric influences on the load‐end shortening response and ultimate compressive load were scrutinised.

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“…Moreover, because the thermal conductivity and specific heat of concrete are low, it can improve the fire behaviour of composite columns. An innovative concrete-filled cold-formed steel (CF-CFS) composite type has recently been presented [1]- [7]. However, up to this stage, only its axial load-bearing capacity [5,6] and fire resistance [1]- [5] have been evaluated, and other aspects, such as design prediction, still need to be explored.…”

Section: Introductionmentioning

confidence: 99%

New fire resistance design approach for concrete‐filled cold‐formed steel (CF‐CFS) built‐up composite column

Rahnavard,

Craveiro,

Simões

2023

ce papers

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Prior research investigated the fire resistance prediction of the concrete‐filled cold‐formed steel (CF‐CFS) built‐up columns when subjected to axial compression and high temperatures. However, a complex heat transfer analysis is needed to calculate the temperature development of the steel and concrete components of the composite cross‐section to predict the fire resistance of a composite column, as provided in EN1994‐1‐2. In order to estimate equivalent temperatures for the steel and concrete used in CF‐CFS built‐up column sections, this research provides a series of empirical formulae. A two‐dimensional heat transfer analysis calibrates a finite element model to estimate temperature across the CF‐CFS built‐up column sections. The concrete infill was simplified by separating into an inner and outer core. The empirical formulas' accuracy was assessed by comparing them with 2D heat transfer analysis results. Finally, the fire resistance of a CF‐CFS column was obtained using numerical simulation and compared with the analytical prediction following EN 1994‐1‐2 incorporated with the current empirical formulation. The results showed a high accuracy of the empirical formulation to determine the equivalent temperatures of the steel and concrete core components.

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Concrete-filled cold-formed steel (CF-CFS) built-up columns under compression: Test and design

Cited by 49 publications

References 49 publications

Design Model of Rectangular Concrete-Filled Steel Tubular Stub Columns under Axial Compression

Design Model of Rectangular Concrete-Filled Steel Tubular Stub Columns under Axial Compression

Effects of section slenderness and concrete strength on the cross‐sectional behaviour of lightweight concrete‐filled cold‐formed built‐up box sections

New fire resistance design approach for concrete‐filled cold‐formed steel (CF‐CFS) built‐up composite column

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