High strength steel square and rectangular tubular stub columns infilled with concrete

Cai, Yancheng; Su, Meini; Chen, Xuerui; Young, Ben

doi:10.1016/j.jcsr.2021.106536

Cited by 37 publications

(11 citation statements)

References 32 publications

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“…Lai [19] collected 124 sets of axial compression test data of HSCFSTs and compared them with the design method provided by the American Institute of Steel Construction (AISC) specification. Cai and Young [20] experimentally analyzed 26 square CFST stub columns (concrete strength: 34.9 MPa ≤ f c ≤ 112.7 MPa, steel strength: 629 MPa ≤ f s ≤ 1022 MPa) and conducted extensive numerical analyses on the confinement effect, material, geometry, and contact method. They also evaluated the applicability of the design codes for the compressive strengths of square and rectangular stub columns based on the test results and numerical calculation results.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of the Mechanical Properties of Axially Compressed Square High-Strength Concrete-Filled Steel Tube Stub Columns Based on a Constitutive Model for High-Strength Materials

Ding

et al. 2022

Materials

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With the development of new concrete technology, high-strength concrete has been used worldwide. In particular, more economic benefits can be achieved by applying high-strength concrete-filled steel tube (HSCFST) columns in the concrete core walls of super high-rise buildings. A constitutive relation with high applicability for high-strength materials with different strength grades is proposed. Based on this constitutive model, a brick element model of 181 sets of axially compressed square HSCFST members is established and experimentally verified. The effects of the concrete strength, diameter-to-thickness ratio, and steel yield strength on the axial compressive capacities of these members were investigated based on finite element calculation results. The results showed that with an increase in the concrete strength, the ultimate bearing capacities of CS-CC, HS-HC, HS-CC, and CS-HC stub column members increased by 60%, 24%, 44%, and 21% at most, respectively. Additionally, as the steel yield strength increased, the ultimate bearing capacities of CS-CC, HS-HC, HS-CC, and CS-HC stub column members increased by 8.8%, 5.1%, 8.5%, and 5.2%, respectively, Hence, material strength has the greatest impact on CS-CC and HS-CC. The confinement effect of the square steel tube on the concrete weakens as the strength grade of steel or concrete increases. Notably, the confinement effect of steel tube on the concrete is strongest in CS-CC and weakest in the CS-HC. In addition, the confinement coefficients of square HSCFST stub columns with different combinations of concrete and steel strengths were analyzed. Based on the superposition principle in the ultimate state, a practical axial compressive capacity calculation formula for three types of square HSCFSTs is established. Compared with existing major design code formulas, the proposed formula is more accurate and concise and has a clear physical meaning.

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Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of the Mechanical Properties of Axially Compressed Square High-Strength Concrete-Filled Steel Tube Stub Columns Based on a Constitutive Model for High-Strength Materials

Ding

et al. 2022

Materials

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“…However, as shown in Table 1 , during the study, scholars [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ] also found that when high-strength steel is applied to building structures, the existing standards cannot accurately predict the mechanical performance of this type of specimen. Besides, design approaches from standards, including AISC360-16 [ 40 ], EN1994-1-1: 2004 [ 41 ], and JGJ138-2016 [ 42 ], are based on the related research results of ordinary steel; therefore, the scope of application needs to be verified.…”

Section: Introductionmentioning

confidence: 99%

The Investigation on Mechanical Performances of High-Strength Steel Reinforced Concrete Composite Short Columns under Axial Load

Wang

Duan

et al. 2022

Materials

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At present, the existing standards (AISC360-16, EN1994-1-1:2004, and JGJ138-2016) lack relevant provisions for steel-reinforced concrete (SRC) composite columns with high-strength steel. To investigate the axial compressive mechanical performance of short high-strength steel-reinforced concrete (HSSRC) columns, the axial load test was conducted on 12 short composite columns with high-strength steel and ordinary steel. The influences of steel strength, steel ratio, and the section form of steel on the failure modes, bearing capacity, and ductility of the specimens were studied. Afterward, the experimental data were compared with the existing calculation results. The results show: compared with the specimens with Q235 steel, the bearing capacity of the specimens with Q460 steel increases by 7.8–15.3%, the bearing capacity of the specimens with Q690 steel increases by 13.2–24.1%, but the ductility coefficient increases by 15.2–202.4%; with the increase of steel ratio, the bearing capacity and ductility of specimens are significantly improved. A change of the steel cross-section could influence the ductility of SRC columns more than their bearing capacity. Moreover, the calculation results show that present standards could not predict the bearing capacity of HSSRC columns. Therefore, a modified method for determining the effective strength of steel equipped in HSSRC columns was proposed. The results of the ABAQUS simulation also showed that the addition of steel fibers could significantly improve the bearing capacity of Q690 HSSRC columns. The research results provide a reference for engineering practices.

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“…They also pointed out that EC4 provisions reasonably estimate the strength of CFST columns if the confinement effect was considered. Other noticeable experimental investigations on CFST with ultra-high strength steel and concrete have been conducted by Khan et al [15,16], Chen et al [17], Huang et al [18], Nguyen et al [19], and Cai et al [20].…”

Section: Introductionmentioning

confidence: 99%

“…Figure 5. Stress-strain relation of confined concrete The tensile strength of concrete can be calculated based on the compressive strength of unconfined concrete based on the suggestion of ACI 224.2 R92 [39] as(20) …”

mentioning

confidence: 99%

Finite element modelling of rectangular concrete-filled steel tube stub columns incorporating high strength and ultra-high strength materials under concentric axial compression

Thai

Ngo-Huu

Thuat

2021

STCE

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This study presents a unified approach to simulate the behavior of rectangular concrete-filled steel stub columns incorporating high strength and ultra-high strength materials subjected to concentric axial compression. The finite element model is developed based on Abaqus software, which is capable of accounting for geometrical nonlinearity, material plasticity, and interaction between multi-physics. The proposed model incorporates the influences of residual stress for welded-box steel sections and initial imperfection. A novel stress-strain relation of confined concrete is proposed to account for the composite action, which might increase the strength and ductility of infilled concrete under multi-axial compressive conditions. Various verification examples are conducted with wide ranges of geometrical and material properties. The simulation results show that the proposed model can accurately predict the ultimate strength, load-deformation relations, and failure mode of the experimental specimens.

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High strength steel square and rectangular tubular stub columns infilled with concrete

Cited by 37 publications

References 32 publications

Finite Element Analysis of the Mechanical Properties of Axially Compressed Square High-Strength Concrete-Filled Steel Tube Stub Columns Based on a Constitutive Model for High-Strength Materials

Finite Element Analysis of the Mechanical Properties of Axially Compressed Square High-Strength Concrete-Filled Steel Tube Stub Columns Based on a Constitutive Model for High-Strength Materials

The Investigation on Mechanical Performances of High-Strength Steel Reinforced Concrete Composite Short Columns under Axial Load

Finite element modelling of rectangular concrete-filled steel tube stub columns incorporating high strength and ultra-high strength materials under concentric axial compression

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