Uniaxial compression performance of rectangular CFST columns with different internal construction characteristics

Hao, Dong; Li, Yanna; Cao, Wanlin; Qiao, Qiyun; Li, Ruijian

doi:10.1016/j.engstruct.2018.09.051

Cited by 45 publications

(8 citation statements)

References 25 publications

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“…To date, the research in this field has focused on the comprehensive static and seismic behaviors of such a kind of composite column, as well as experimental investigations into structural behavior of composite columns subjected to axial [14,15], eccentric [16,17], and hysteretic loads [18,19,20], analytical studies on buckling of steel tubes [11,21] and the stress–strain relationship model of concrete [22,23]. However, to the best knowledge of the authors, the numerical and experimental studies on the responses of short square and rectangular CFST columns exposed to fire have been rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Axial Compression Performance of Square Thin Walled Concrete-Filled Steel Tube Stub Columns with Reinforcement Stiffener under Constant High-Temperature

Lyu

et al. 2019

Materials

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This study investigated the axial compressive performance of six thin-walled concrete-filled steel tube (CFST) square column specimens with steel bar stiffeners and two non-stiffened specimens at constant temperatures of 20 °C, 100 °C, 200 °C, 400 °C, 600 °C and 800 °C. The mechanical properties of the specimens at different temperatures were analyzed in terms of the ultimate bearing capacity, failure mode, and load–displacement curve. The experiment results show that at high temperature, even though the mechanical properties of the specimens declined, leading to a decrease of the ultimate bearing capacity, the ductility and deformation capacity of the specimens improved inversely. Based on finite element software ABAQUS, numerical models were developed to calculate both temperature and mechanical fields, the results of which were in good agreement with experimental results. Then, the stress mechanism of eight specimens was analyzed using established numerical models. The analysis results show that with the increase of temperature, the longitudinal stress gradient of the concrete in the specimen column increases while the stress value decreases. The lateral restraint of the stiffeners is capable of restraining the steel outer buckling and enhancing the restraint effect on the concrete.

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Section: Introductionmentioning

confidence: 99%

Axial Compression Performance of Square Thin Walled Concrete-Filled Steel Tube Stub Columns with Reinforcement Stiffener under Constant High-Temperature

Lyu

et al. 2019

Materials

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“…To avoid instability and offset of the column during the loading, a lateral support is connected to the upper-end of the column. e bearing capacity of each concrete-filled steel tubular column can be calculated per the literature [16][17][18]. e constant vertical load, which depends on the axial compressive ratio, was applied on the top of the column by a hydraulic jack with bearing capacity of 1,000 kN.…”

Section: Materials Propertiesmentioning

confidence: 99%

Seismic Performance of Exterior Steel Ring-Stiffener Joint

Zhao-qiang

Yao

et al. 2019

Advances in Civil Engineering

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We study the seismic performance of the exterior steel ring-stiffener (ESRS) joint, a member that is used to connect a steel beam to a square steel tubular column filled with steel fibre recycled concrete for seismic resistance. To this end, the influence of seismic factors such as axial compression ratio and beam-column linear stiffness ratio on seven specimens is studied. A physical test is conducted on the specimens with a series of cyclic loadings. The testing and analysis of hysteretic loops and skeleton curves of the ESRS joints revealed the seismic performance characteristics including failure mode, rigidity, ductility, bearing-capacity degradation, and energy dissipation capacity. The results reveal (a) damage to the specimens at the beam-end near the joint, (b) no failure at the joints’ core area and column, (c) appearance of a plastic hinge at the beam-end near the joint, and (d) plump spindle-shaped hysteretic loops and normal rigidity degradation curves in the specimens. The specimens are then simulated with the finite element method (FEM) and the results are compared with those of the physical test.

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“…Under these conditions of local buckling of a steel tube and a loss of constraint of CCC, the strength of long columns decreases sharply [5]. erefore, it is necessary to conduct an in-depth analysis of the instability modes of RCFST to explore the influence of c and λ on RCFST [6]. Further, the plane static instability modes of the RCFST long column should be analyzed emphatically [7].…”

Section: Introductionmentioning

confidence: 99%

Coupling Effect of Eccentricity and Slenderness Ratios on RCFST Column Instability Modes

Guo

2021

Mathematical Problems in Engineering

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The instability damage modes of rectangle concrete-filled steel tube (RCFST) columns that are subjected to eccentric compression can be divided into two types based on the modified Jezek analytical procedure, namely, the eccentricity ratio (γ) and the slenderness ratio (λ) coupling effect. The RCFST columns have unilateral compression yield failure mode when γ is small. However, it has compressive and tensile mode on both sides when the value of γ is large. In this work, parametric analyses were performed to test 32 RCFST long columns by varying γ with different λ combinations. From the analysis, it was found that the results of the theoretical analysis of the load-tension strain (P-ε) responses and the instability modes of the RCFST long columns are similar to the experimental results. Further, the proposed analytical method aids in better understanding the effects of γ and λ coupling on the stability behavior of the RCFST columns.

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Uniaxial compression performance of rectangular CFST columns with different internal construction characteristics

Cited by 45 publications

References 25 publications

Axial Compression Performance of Square Thin Walled Concrete-Filled Steel Tube Stub Columns with Reinforcement Stiffener under Constant High-Temperature

Axial Compression Performance of Square Thin Walled Concrete-Filled Steel Tube Stub Columns with Reinforcement Stiffener under Constant High-Temperature

Seismic Performance of Exterior Steel Ring-Stiffener Joint

Coupling Effect of Eccentricity and Slenderness Ratios on RCFST Column Instability Modes

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