Hysteretic behavior of multi-cell L-shaped concrete-filled steel tubular columns at different loading angles

Zheng, Yanying; Yang, Shaokun; Lai, Pengsong

doi:10.1016/j.engstruct.2019.109887

Cited by 28 publications

(8 citation statements)

References 32 publications

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“…Numerous researchers have investigated the mechanical performance of L-shaped CFST columns through ABAQUS. Zheng [11] investigated the effects of various parameters on lateral load-displacement curves of L-shaped CFST columns under diagonal loading. Chen [13] analyzed the influence of different loading directions on the ultimate bearing capacity of L-shaped CFST columns.…”

Section: Finite Element Model (Fem)mentioning

confidence: 99%

“…Shen [10] tested six specimens under constant axial and cyclically varying lateral loads to investigate the effects of width to depth ratio of section, depth to thickness ratio of steel tube, and axial load level on the strength, as well as stiffness, ductility, and energy dissipation of L-shaped CFST columns. Zheng [11] presented four tests carried out on multi-cell L-shaped CFST columns under combined constant compression and lateral cyclic loads. The main variables were loading angles and axial load levels.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Finite Element Model (Fem)mentioning

confidence: 99%

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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“…Additionally, some scholars [10][11][12][13][14][15] have used vertical steel plates, angled steel, or open-hole steel plates to strengthen the bending rigidity of the steel plate section in order to achieve the common working effect of steel tubes and core concrete. Han Linhai [16], Tao Zhong [17], Cheng Rui [18], Tu Yongqing [19,20], and Zheng Yongqian [21] adopted a multi-cell form to eliminate the adverse effects of the concave corners of special-shaped CFST columns. The measures can improve the bearing capacity and ductility of special-shaped steel tube concrete columns to some extent, but there are also some issues, such as the complexity of the processing technology, the uneven side wall of the steel tube, and the insufficient improvement of the component's ductility.…”

Section: Introductionmentioning

confidence: 99%

Axial Compressive Behavior of Cross-Shaped CFST Stub Columns with Steel Bar Truss Stiffening

Gong

et al. 2023

Materials

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Concrete-filled steel tube (CFST) columns have been widely used in residential buildings due to their high bearing capacity, good ductility, and reliable seismic performance. However, conventional circular, square, or rectangular CFST columns may protrude from the adjacent walls, resulting in inconvenience in terms of the arrangement of furniture in a room. In order to solve the problem, special-shaped CFST columns, such as cross-shaped, L-shaped, and T-shaped columns, have been suggested and adopted in engineering practice. These special-shaped CFST columns have limbs with the same width as the adjacent walls. However, compared with conventional CFST columns, the special-shaped steel tube provides weaker confinement to the infilled concrete under axial compressive load, especially at concave corners. The parting at concave corners is the key factor affecting the bearing capacity and ductility of the members. Therefore, a cross-shaped CFST column with steel bar truss stiffening is suggested. In this paper, 12 cross-shaped CFST stub columns were designed and tested under axial compression loading. The effects of steel bar truss node spacing and column–steel ratio on the failure mode, bearing capacity, and ductility were discussed in detail. The results indicate that the columns with steel bar truss stiffening can change the final deformation mode of the steel plate from single-wave buckling to multiple-wave buckling, and the failure modes of columns also subsequently change from single-section concrete crushing failure to multiple-section concrete crushing failure. The steel bar truss stiffening shows no obvious effect on the axial bearing capacity of the member but significantly improves the ductility. The columns with a steel bar truss node spacing of 140 mm can only increase the bearing capacity by 6.8% while nearly doubling the ductility coefficient from 2.31 to 4.40. The experimental results are compared with those of six design codes worldwide. The results show that the Eurocode 4 (2004) and the Chinese code CECS159-2018 can be safely used to predict the axial bearing capacity of cross-shaped CFST stub columns with steel bar truss stiffening.

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“…Another form of L-shaped CFSTs is a multicell composite L-shaped CFST column made of three rectangular CFSTs welded together, which has been studied and improved by some scholars in terms of the static behavior 30,31 and hysteretic behavior. 32,33 Columns can enhance the restraining effect on the concrete, but the welded double-layer steel tube causes material waste, and the welding conditions cannot be fully guaranteed. Chen et al 34 proposed a new type of CFST column consisting of several square CFSTs welded by lacing bars or steel plates.…”

Section: Introductionmentioning

confidence: 99%

“…However, binding bars leave many holes in the column during installation, reducing the integrity of the column. Another form of L‐shaped CFSTs is a multicell composite L‐shaped CFST column made of three rectangular CFSTs welded together, which has been studied and improved by some scholars in terms of the static behavior 30,31 and hysteretic behavior 32,33 . Columns can enhance the restraining effect on the concrete, but the welded double‐layer steel tube causes material waste, and the welding conditions cannot be fully guaranteed.…”

Section: Introductionmentioning

confidence: 99%

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

Huang

Wang

Zhang

et al. 2022

Structural Concrete

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Hysteretic behavior of multi-cell L-shaped concrete-filled steel tubular columns at different loading angles

Cited by 28 publications

References 32 publications

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

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

Axial Compressive Behavior of Cross-Shaped CFST Stub Columns with Steel Bar Truss Stiffening

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

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