Behavior and design of concrete-filled narrow rectangular steel tubular (CFNRST) stub columns under axial compression

Zhang, Lei; Yang, Shaohua; Fu, Bo; Tong, Genshu; Tong, Jing-Zhong; Ting, Jing

doi:10.1016/j.jobe.2021.102166

Cited by 11 publications

(4 citation statements)

References 16 publications

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“…Columns with square cross-sections exhibited the greatest ductility, and the elongation of one of the cross-section sided has a negative effect on its ductility. Similar observations were presented in [ 39 ].…”

Section: Ductility Of Cfst Columns—state-of-the-artsupporting

confidence: 91%

Experimental Investigation on the Vertical Ductility of Rectangular CFST Columns Loaded Axially

Grzeszykowski

Szmigiera

2022

Materials

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A total of 5 steel and 21 rectangular composite concrete-filled steel tube (CFST) columns of moderate slenderness were tested to investigate their ductility under axial compression. The importance of the vertical ductility of columns was discussed, and a novel ductility measure was proposed and utilized to examine the ductility of tested specimens. The analyses showed that the ductility of axially compressed CFST columns highly depends on their failure mode. The key feature influencing the ductility is their ability to dissipate the energy of imposed loads. The larger the volume of a material that may permanently deform and consequently dissipate the energy, the greater this ability. In consequence, the ductility of specimens exhibiting local failure mode was higher in comparison to the columns that underwent global or mixed global—local failure. It was found that both steel and composite columns were able to carry axial loads in the post-critical state; but due to the limitations of local buckling of the steel cross-section in the concrete core and concrete confinement, all tested composite columns showed greater ductility than their steel counterparts.

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Section: Ductility Of Cfst Columns—state-of-the-artsupporting

confidence: 91%

Experimental Investigation on the Vertical Ductility of Rectangular CFST Columns Loaded Axially

Grzeszykowski

Szmigiera

2022

Materials

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“…Therefore, the accuracy of the bearing capacity prediction model based on the Gaussian process regression algorithm in this paper is better than that of the traditional empirical formula. In order to verify that the proposed bearing capacity model can predict data outside the database, this article collected an additional 60 sets of data [71][72][73][74] as test sets to verify the accuracy of the formula. From the results in Figure 12, it can be seen that the data points calculated by the proposed calculation formula are concentrated within an error line of ±10%, with an accuracy of 93.73%.…”

Section: Discussionmentioning

confidence: 99%

An Improved Equation for the Bearing Capacity of Concrete-Filled Steel Tube Concrete Short Columns Based on GPR

Ding

Jia

2023

Buildings

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The determination of the bearing capacity prediction model of concrete-filled steel tubular columns is a key issue in the structural design of prefabricated buildings, which directly relates to the stability and safety of prefabricated buildings. The purpose of this paper is to study the bearing capacity model of concrete-filled steel tubular columns, and propose an explicit formula based on the Gaussian process regression algorithm to calculate the bearing capacity. In order to solve the problem of low accuracy of the traditional empirical bearing capacity model, this paper first proposes a more accurate bearing capacity prediction model based on Gaussian process regression algorithm to automatically learn and capture the characteristics of 122 groups of test data; the paper then determines the function of high sensitivity parameters and section influence parameters through the established bearing capacity prediction model, and this process gives the display formula. Compared with the implicit formula given by a machine learning model, the explicit formula proposed in this paper is more suitable for practical engineering design. In order to verify the validity of the formula, we generated the bearing capacity data through the proposed formula based on the test data and used the descriptive statistical method to verify. The results show that the proposed formula is superior to other existing methods, the error between the data generated by the proposed formula and the test data is smaller, and its accuracy reaches 93.73%, which is more suitable for calculating the bearing capacity of concrete-filled steel tubes with different cross sections.

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“…Süleyman Ipek [29] developed an experimental and analytical study on CFST columns with different cross-sections to investigate their behavior against axial load; the study focused on the elliptical sections, and the study showed that three types of failure occurred in the elliptical section, shear failure, local buckling failure, and phenomena of the elephant foot buckling, which occurred nearly of the top and bottom of the CFST columns; finally, the study showed that the design codes formula of AISC and EC4 for (rectangular and circular) section were modified to be capable of expecting the axial load value for the elliptical section of the CFST columns. Lei Zhang [30] carried out an experimental study on CFST narrow rectangular columns to study their behavior under axial compressions loading. Twenty-four experimental specimens were tested to involve the behavior of CFST columns with a narrow rectangular section, The study showed that the local buckling failure of CFST occurred near the buckling ring, and the study demonstrated that when the ratios of D/B decreased, D/t increased the ductility index and the strength index improved remarkably; finally the study showed that more different codes have a good predictor to the safe design loads.…”

Section: Introductionmentioning

confidence: 99%

Parametric Study on the Behavior of Steel Tube Columns with Infilled Concrete—An Analytical Study

et al. 2022

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Concrete-filled steel tube (CFST) columns are used in tall buildings and bridges, and they provide more rigidity and higher bearing capacity, but buckling affects their behavior. There is an exceptional need to study the behavior of these columns under various conditions. The numerical method is beneficial in supplementing the experimental works and is used to explore the effects of various parameters because of the limitations in cost, apparatus, and time of the experimental program. The various parameters, such as the different slenderness ratios, i.e., column-height-to-cross-section-dimension (H/D), different steel-tube-thickness-to-column-dimension (D/t), and different compressive strength of concrete to yield strength of steel tube ratio (fc/fy) under concentric axial loading are considered in this current study. Firstly, a finite element model used the “ANSYS” software program and was constructed to validate the results of the experimental works. The extensive numerical models were carried out to extensively widen the study in this field. The numerical work was conducted on sixty-four specimens. Moreover, the analytical calculations from the different international codes/standards were compared with the numerical results to test their reliability in predicting the ultimate carrying loads. The study provided results that show the improvement effect of CFST columns with the high compressive strength of infilled concrete, while no remarkable enhancement effect with the high yield strength of steel tube was observed. Increasing the columns’ diameter is more effective in enhancing the load capacity (about three times more) than increasing the tube thickness (about 1.3 times). Ring stiffeners for long CFST columns (H/D > 12) do not lead to any enhancement of the column behavior due to yielding occurring firstly at the location of the rings. ECP205-2007 is the most conservative design code in predicting the load capacity of CFST columns, while the AIJ design code is good at predicting the ultimate load failure compared to the other codes/standards. Eurocode 4 provides underestimation values of the load-carrying capacity of CFST columns.

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Behavior and design of concrete-filled narrow rectangular steel tubular (CFNRST) stub columns under axial compression

Cited by 11 publications

References 16 publications

Experimental Investigation on the Vertical Ductility of Rectangular CFST Columns Loaded Axially

Experimental Investigation on the Vertical Ductility of Rectangular CFST Columns Loaded Axially

An Improved Equation for the Bearing Capacity of Concrete-Filled Steel Tube Concrete Short Columns Based on GPR

Parametric Study on the Behavior of Steel Tube Columns with Infilled Concrete—An Analytical Study

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