Study on the mechanical behavior of L‐shaped concrete‐filled steel tubular columns under axial compression

Huang, Hong; Wang, Yi; Zhang, Liqing; Chen, Mengcheng; Zhu, Yihua

doi:10.1002/suco.202200015

Cited by 8 publications

(9 citation statements)

References 38 publications

(55 reference statements)

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“…Furthermore, the fly ash itself contains silicate components that can also react with alkaline substances. As a result, the alkaline substances content inside concrete is reduced again because of reaction consumption, which further accelerates the carbonation process of concrete, and the carbonation resistance performance of concrete is therefore weakened 29,42 . Felix et al 8 found that concrete carbonation depth increased with water‐binder ratio, fly ash content, and CO 2 concentration, and there was a positive statistical correlation among these parameters.…”

Section: Influence Factors Of Carbonation Depthmentioning

confidence: 99%

Probabilistic prediction model of concrete carbonation depth considering the influence of multiple factors

Qin

Wang

2023

Structural Concrete

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In order to realize the probability prediction of concrete carbonation depth, this paper proposed a probabilistic prediction model of carbonation depth based on 433 sets of existing experimental data. First, considering the influence of water‐binder ratio, fly ash content, stress level, and carbonation time, a deterministic prediction model of carbonation depth was established based on stepwise regression method. Then, based on the established deterministic prediction model, considering the influence of aleatory and epistemic uncertainties, a probabilistic prediction model of carbonation depth was established, and the posterior distributions of the parameters in the probabilistic prediction model were updated iteratively by using Bayesian theory and Markov chain Monte Carlo method, and the influence of standard deviation of prior distribution of the parameters in probabilistic prediction model on their posterior distributions was discussed. Finally, the prediction accuracy of the probabilistic prediction model was verified by comparing with another 127 sets of existing experimental data and the predicted values of the deterministic prediction model, and the effect of the standard deviations of prior distribution of the parameters on the prediction accuracy of the probabilistic prediction model was analyzed. The results showed that the prediction accuracy of the proposed probabilistic prediction model of carbonation depth after three updates was higher than that of the deterministic prediction model. When the standard deviation of prior distributions of the parameters in probabilistic prediction model was 100, the proposed probabilistic prediction model after three updates had the highest prediction accuracy. Under the tensile stress state of concrete, the prediction accuracy of the probabilistic prediction model was improved by 26.76% compared with the deterministic prediction model, and when the concrete under compressive stress state, the prediction accuracy of the probabilistic prediction model was 44.07% higher than that of the deterministic prediction model.

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Section: Influence Factors Of Carbonation Depthmentioning

confidence: 99%

Probabilistic prediction model of concrete carbonation depth considering the influence of multiple factors

Qin

Wang

2023

Structural Concrete

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“…Tu et al [28,29] analyzed the influence of parameters such as concrete and steel strength on L-shaped CFST columns through FEA and proposed a formula for calculating the axial compressive bearing capacity. Huang [30] proposed a design formula for the bearing capacity of ribbed L-shaped CFST columns that took into account improvements in concrete performance. Chen [31] proposed a simplified strength model of ECB for L-shaped CFST based on the composite yielding method.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Axial Compression Behavior of L-Shaped Concrete-Filled Steel Tubular Columns with Different Combinations

Li,

Tao,

Han

2024

Buildings

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L-shaped concrete-filled steel tubular (CFST) columns, a kind of structural member appropriate for high-rise buildings, not only avoid the defect of conventional square columns protruding from the wall but also have the green and low-carbon properties of steel structures appropriate for fabricated construction. To learn more about their axial compression behavior, refined 3D finite element models were established using the general finite element software ABAQUS. The reliability of the models was subsequently verified based on failure tests and load–displacement relation tests on eight L-shaped specimens. The axial compression mechanism of L-shaped CFST columns was investigated using the verified finite element models. Further systematic parameter analysis was carried out to investigate the influence of parameters such as steel strength, concrete strength, length ratio of long limb to short limb, the angle between the two limbs, and combination methods on the axial compression behavior of L-shaped CFST columns. The results demonstrate that the angle between the two limbs has a significant impact on the stress distribution of concrete and steel pipes. The corner effect increases as the angle between the two limbs decreases. The combination of F-type specimens can better exert the constraint effect of steel pipes on concrete, while the triangular cavity of unequal-limb specimens and specimens with an included angle of 60° cannot effectively trigger the interaction between steel pipes and concrete. The initial stiffness of L-shaped CFST columns increases with an increase in concrete strength and a decrease in limb length ratio, which is not sensitive to changes in steel strength and the included angle. The peak bearing capacity of the specimens increases with increases in steel strength and concrete strength and a decrease in the limb length ratio. Compared to C-type and Z-type specimens, the initial stiffness of F-type specimens is slightly higher, and the peak bearing capacity is significantly increased.

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“…The results demonstrated that the stiffeners could decelerate the development of local buckling, and the mechanical behavior of the welded steel tube concrete columns was better than that of ordinary steel tube concrete columns. Eight L‐shaped concrete‐filled steel tubular short columns with and without stiffeners were conducted by Huang 9 . The mechanisms of the longitudinal stress of the concrete, longitudinal stress of the outer steel tube, et al were discussed.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, under longitudinal and radial stress, the walls of SCFST are susceptible to local buckling, thus weakening the confinement effect of the steel tube on core concrete, which leads to a reduction in the bearing capacity, especially when the wall widthto-thickness ratio (B/t) is comparatively high. 1,2 In response to this problem, researchers [3][4][5][6][7][8][9][10][11] found that setting longitudinal stiffeners in the tube wall can effectively restrict the local buckling and increase the bearing capacity and ductility.…”

Section: Introductionmentioning

confidence: 99%

“…Eight L-shaped concrete-filled steel tubular short columns with and without stiffeners were conducted by Huang. 9 The mechanisms of the longitudinal stress of the concrete, longitudinal stress of the outer steel tube, et al were discussed. The results indicated that the stiffening ribs could delay the occurrence of local buckling failure of the steel tube.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical studies on mechanical behavior of stiffened concrete‐filled square steel tube columns subjected to axial compression

Sun¹,

Xu²,

Zuo³

2022

Structural Concrete

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In this study, nine square concrete‐filled steel tubular (SCFST) columns considering longitudinal stiffeners as parameters were produced to investigate the axial compression mechanical properties of SCFST columns in the condition of constant steel consumption. This included one specimen without stiffeners, three specimens stiffened with one stiffener on each tube wall, two specimens stiffened with two stiffeners on each tube wall, two specimens stiffened with three stiffeners on each tube wall and one specimen stiffened with four stiffeners on each tube wall. Simultaneously, numerical simulations were performed under identical conditions using ABAQUS software. The results showed that the longitudinal stiffeners can act as an out‐of‐plane restriction support to delay the development of local buckling of the steel tube, which indirectly improved the constraint effect of steel tube on core concrete. First, both the number of local buckling and the ultimate displacement of the specimens grew correspondingly when the number of stiffeners increased. As the sub‐wall width‐to‐thickness ratio was increased, the steel tube became prone to local buckling. Second, the installation of stiffeners decreased the confinement effect of steel tube on the core concrete, in which the sub‐wall width‐to‐thickness ratio and the stiffener width‐to‐thickness ratio had a great influence on the ultimate bearing capacity of the specimens. Further, the experimental outcomes indicated that the bearing capacity of stiffened specimens was less than that of the unstiffened specimen. The bearing capacity of the specimens stiffened with three and four stiffeners was higher than that of the specimens stiffened with one and two stiffeners. Third, the stiffener width‐to‐thickness ratio had a considerable impact on the ductility of the specimens. The ductility of specimens stiffened with one and two stiffeners was greater than that of the specimens stiffened with three and four stiffeners. Finally, the finite element simulations were consistent with the experimental process. The confinement factor of stiffened specimens became enlarged when either the number of stiffeners in the same thickness condition increased or the thickness of steel tube wall under condition of the same number of stiffeners grew.

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Study on the mechanical behavior of L‐shaped concrete‐filled steel tubular columns under axial compression

Cited by 8 publications

References 38 publications

Probabilistic prediction model of concrete carbonation depth considering the influence of multiple factors

Probabilistic prediction model of concrete carbonation depth considering the influence of multiple factors

Finite Element Analysis of Axial Compression Behavior of L-Shaped Concrete-Filled Steel Tubular Columns with Different Combinations

Experimental and numerical studies on mechanical behavior of stiffened concrete‐filled square steel tube columns subjected to axial compression

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