Computational analysis of axially loaded thin-walled rectangular concrete-filled stainless steel tubular short columns incorporating local buckling effects

Ahmed, Mizan; Tran, Viet‐Linh; Ci, Junchang; Yan, Xi Feng; Wang, Fangying

doi:10.1016/j.istruc.2021.10.068

Cited by 15 publications

(5 citation statements)

References 35 publications

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“…In the development of this database, the ultimate axial load of CFSST columns was taken as the test ultimate axial load of the columns at 1% strain, as suggested by researchers earlier. [76][77][78][79] The developed database consisted of a total of 142 test data, covering a wide range of column parameters including:…”

Section: Database Collectionmentioning

confidence: 99%

“…In addition, considering the distinguish strain hardening behavior of stainless steel, some CFSST columns did not undergo strain softening and were tested for very large strain. In the development of this database, the ultimate axial load of CFSST columns was taken as the test ultimate axial load of the columns at 1% strain, as suggested by researchers earlier 76–79 . The developed database consisted of a total of 142 test data, covering a wide range of column parameters including:

D = 50 - 325 mm

t = 0.9 - 12 mm

D / t = 17 - 106

f_{c}^{'} = 19 - 75 MPa

f_{y} = 225 - 544 MPa

ξ = 0.26 - 3.2

L = 150 - 2940 mm

, and

P_{\exp} = 112 - 13499 kN

.…”

Section: Database Collectionmentioning

confidence: 99%

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Prediction of the ultimate axial load of circular concrete‐filled stainless steel tubular columns using machine learning approaches

Tran

Ahmed

Gohari

2023

Structural Concrete

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This paper investigates the accuracy of the existing empirical design models and different machine learning (ML) models, known as Decision Tree (DT), Random Forest (RF), K‐Nearest Neighbors (KNN), Adaptive Boosting (AdaBoost), Gradient Boosting Regression Tree (GBRT), and Extreme Gradient Boosting (XGBoost) in predicting the ultimate axial load of circular concrete‐filled stainless steel tubular (CFSST) columns under axial loading. A test database encompassing the test results of 142 CFSST columns is used to validate the accuracy of the existing empirical design and different ML models. It was demonstrated that all the ML models can provide a better estimation of the ultimate axial load than the existing empirical design models do, in which XGBoost can provide the best estimation of the ultimate axial load of CFSST columns. Finally, a simple equation is proposed based on the XGBoost model for the practical design of CFSST columns.

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Section: Database Collectionmentioning

confidence: 99%

D = 50 - 325 mm

t = 0.9 - 12 mm

D / t = 17 - 106

f_{c}^{'} = 19 - 75 MPa

f_{y} = 225 - 544 MPa

ξ = 0.26 - 3.2

L = 150 - 2940 mm

, and

P_{\exp} = 112 - 13499 kN

.…”

Section: Database Collectionmentioning

confidence: 99%

Prediction of the ultimate axial load of circular concrete‐filled stainless steel tubular columns using machine learning approaches

Tran

Ahmed

Gohari

2023

Structural Concrete

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“…Concrete‐filled steel tubular (CFST) columns offer improved strength, ductility, fire and seismic performance compared with traditional reinforced concrete columns; therefore are widely used in tall building structures, bridge piers and other composite constructions 1‐5 . The steel tube acts as formwork during the construction and provides confinement to the core concrete 6,7 .…”

Section: Introductionmentioning

confidence: 99%

“…Concrete-filled steel tubular (CFST) columns offer improved strength, ductility, fire and seismic performance compared with traditional reinforced concrete columns; therefore are widely used in tall building structures, bridge piers and other composite constructions. [1][2][3][4][5] The steel tube acts as formwork during the construction and provides confinement to the core concrete. 6,7 However, the outer tube of CFST columns can be exposed to a harsh environment particularly in the marine environment which may cause significant corrosion to CFST columns, thus may affect their mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies of axially loaded square concrete‐encased concrete‐filled large‐diameter steel tubular short columns

Kong²,

Ahmed

et al. 2022

Structural Concrete

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This article presents experimental and numerical studies on the axial compressive behavior of square concrete‐encased concrete‐filled steel tubular (CECFST) short columns composed of a circular inner steel tube. Tests on six full‐scale short CECFST columns with the inner circular tube diameter varying from 320 to 500 mm were carried out to study the influences of sectional diameter and the tube thickness of circular CFST columns on their axial performance. A theoretical model is developed using fiber analysis method and validated against a large test database. The accuracy of various codified design models is evaluated and a simple model is proposed to calculate their ultimate strengths. Test results show that CECFST columns have improved load carrying capacity and can sustain large axial loads without significant strength degradation. In addition, increasing the thickness of the steel tube significantly improves the composite action of the steel and concrete of the inner CFST column, which increases the compressive strength of CECFST columns by 27.3%. However, the rate of increase in the compressive strength of the core concrete of the CFST column has been found to be higher for the column with a smaller local slenderness ratio. The ductility of CECFST columns is influenced by the concrete strength and the spacing of the stirrups. Furthermore, the design model suggested in this study can provide a better estimation than the codified design models.

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“…Although scholars have done a lot of work in the research of CFSST, the available researches include the following: (1) performance of CFSST columns under combined compression and bending, [15][16][17][18] (2) performance of CFSST members subjected to tension, [19] and (3) the research on the behavior, analysis, and design of concrete-filled double-skin steel tubular (CFDST). [6,[20][21][22] (4) Aspects of other research on CFSST members include bond-slip and flexural and fire-resistant behavior.…”

Section: Introductionmentioning

confidence: 99%

Size effect of circular concrete‐filled stainless steel tubular short columns under axial compression

Liu

Wang

Yuan

2022

Structural Design Tall Build

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Summary Concrete‐filled stainless steel tube (CFSST) members combine the advantages of stainless steel materials and concrete‐filled steel tube (CFST) members. Therefore, it has a broad range of applications than CFST members in the marine environment and other scenarios requiring great durability and corrosion resistance. However, there are limited researches on the large‐sized CFSST members. In this paper, 30 circular CFSST members with varying steel ratios (3.7% ≤ α ≤ 10.3%), diameters (500 mm ≤ D ≤ 900 mm), and strength of concrete ( fcu = 40 MPa, 50 MPa) are studied on the size effect under axial compression. For peak axial stress, peak axial strain, and composite elastic modulus, size effects are investigated. According to the results, the peak axial stress and peak axial strain of the members increase with the increase in diameter. The modulus of composite elasticity essentially stays constant as the diameter increases, showing that there is no obvious size effect on the composite elastic modulus. The size effect of peak axial stress and peak axial strain is influenced by the steel ratio. Increasing the steel ratio tended to decrease the size effect. According to the generated data, it was found that the current codes of Chinese and European underestimate the ultimate bearing capacity of CFSST short columns significantly. To this end, the resistances of the large‐sized austenitic CFSST columns with a low steel ratio are well predicted by the proposed design model after being modified, based on GB 50936‐2014 and EN 1994‐1‐1 design codes.

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Computational analysis of axially loaded thin-walled rectangular concrete-filled stainless steel tubular short columns incorporating local buckling effects

Cited by 15 publications

References 35 publications

Prediction of the ultimate axial load of circular concrete‐filled stainless steel tubular columns using machine learning approaches

Prediction of the ultimate axial load of circular concrete‐filled stainless steel tubular columns using machine learning approaches

Experimental and numerical studies of axially loaded square concrete‐encased concrete‐filled large‐diameter steel tubular short columns

Size effect of circular concrete‐filled stainless steel tubular short columns under axial compression

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