Mechanical behavior of self‐stressing steel slag aggregate concrete filled steel tubular stub columns

Yu, Feng; Fang, Yuan; Zhang, Yang; Xu, Lin; Bai, Rui

doi:10.1002/suco.201900363

Cited by 24 publications

(22 citation statements)

References 38 publications

(70 reference statements)

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“…This is because the composite action between the steel tube and infilled concrete can be theoretically derived once these parameters are obtained. However, existing studies [5,[34][35][36][37][38][39] assume that the von Mises yield criterion can be employed to define the ultimate state of the steel tube in composite columns:…”

Section: Composite Action Model Of Lacfcst Stub Columnsmentioning

confidence: 99%

Analytical Modelling of LACFCST Stub Columns Subjected to Axial Compression

Lyu

Ding

et al. 2021

Mathematics

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This paper presents a numerical investigation of lightweight aggregate concrete-filled circular steel tubular (LACFCST) stub columns under axial compression. A finite 3D solid element model of the LACFCST stub column was established by adopting a plastic-damage constitutive model of lightweight aggregate concrete (LAC). The finite element model (FEM) analysis results revealed that the confinement effect of the steel tube on the infilled LAC was weaker than that on the infilled conventional concrete. A parametric study making use of 95 full-scale FEMs was conducted to investigate the influences of various design parameters of LACFCST stub columns on their ultimate axial bearing capacity and the composite actions. Moreover, a numerical model of the axial and transverse stress of steel tubes at the ultimate state of LACFCST columns was proposed using the regression method. Based on the equilibrium conditions and the proposed model, a practical design formula making use of an enhancement factor was derived to estimate the ultimate bearing capacity of LACFCST stub columns by using the superposition method. The validity of the proposed formula was verified against the experimental data of 49 LACFCST stub column specimens under the axial loading available in the literature. Meanwhile, the accuracy and conciseness of the proposed formula were evaluated by comparison with the formulas suggested by the existing design codes.

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Section: Composite Action Model Of Lacfcst Stub Columnsmentioning

confidence: 99%

Analytical Modelling of LACFCST Stub Columns Subjected to Axial Compression

Lyu

Ding

et al. 2021

Mathematics

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“…3 shows the influences of two parameters, i.e., Ex and D/t , on the ultimate load capacity of the axially loaded SSSCFST short columns. The incremental range of load capacity (Nu/N0) [17] of the axially loaded columns was plotted in Fig. 3(a).…”

Section: Ultimate Load Capacity Analysismentioning

confidence: 99%

Performance and Capacity Calculation Methods of Self-Stressing Steel Slag Concrete Filled Steel Tubular Short Columns Subjected to Axial Load

2021

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This paper experimentally investigates the mechanical performance of the self-stressing steel slag concrete filled steel tubular (SSSCFST) columns. Six short columns subjected to axial load are tested and the accuracy of different prescriptive methods is evaluated. The effect of the studied parameters, such as the expansion rate of steel slag concrete (SSC) (Ex) and diameter-thickness ratio of steel tube (D/t), is considered. The failure modes are observed and the load-displacement curves of the specimens are obtained. The SSSCFST short columns with the low confinement effect coefficient under axial load are damaged by shear deformation, while the outward local buckling dominates the failure of the axially loaded SSSCFST short columns with the high confinement effect coefficient. It is observed that the incremental range of the load capacity can be raised by enhancing the expansion rate of SSC. The ultimate load capacity and displacement of the columns decrease as the diameter-thickness ratio increases. Compared with the experimental results, the Hong Kong Code CoPHK (2011) and Australian Standard AS5100-2017 (2017) underestimate the ultimate load capacity of the axially loaded SSSCFST short columns. While, better predictions on the column strength can be achieved by the British Standard BS EN1994-2 ( 2005) and Chinese Specification DBJ/T13- 51-2010 (2010). Additionally, a validated finite element (FE) model for the SSSCFST short columns is adopted to perform parametric studies to broaden the available experimental results about their behaviors.

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“…While in structural design, the concrete strength is often described with the nominal cube test strength f cu . With referring to Reference 4, the relation between the axial strength f c versus f cu can be expressed with Equation (7).…”

Section: Shear Stress Of the Core Concretementioning

confidence: 99%

“…The CFST columns are commonly applied to bear high axial loads due to the high strength capacities. The majority researches on CFST columns are also around the capacity and strength calculations under axial compression, [5][6][7][8][9] or eccentric compression conditions. 10 In recent decades, the CFST members are also applied into bridge girders or inclined columns that bear considerable bending loads.…”

Section: Introductionmentioning

confidence: 99%

Composite action of rectangular concrete‐filled steel tube columns under lateral shear force

Ding

Chen

et al. 2020

Structural Concrete

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The rectangular concrete-filled steel tube (RCFST) has been widely applied into many engineering fields like buildings and bridges. However, the shear mechanisms and the universal design methods under lateral shear forces still remain to be fully understood. In this paper, the composite action of RCFST columns under lateral shear forces was systematically investigated with improved 3-dimensional finite element simulations. The models adopted the improved material constitutive models and detailed contact interactions between the encased steel tube and core concrete. On the basis of available test data and numerical results of parametric studies, the critical shear span ratio and its variation range were determined. The composite effect and interactions between the encased steel tube and core concrete under different configurational dimensions and loading conditions were investigated. Calculation formulas of the shear stiffness and capacity were proposed based on identified features. The cooperative working mechanism and the constraining effect of steel tube were considered. The proposed calculations were then compared to available design regulations in different countries, and yielded more accurate predictions than the others.

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Mechanical behavior of self‐stressing steel slag aggregate concrete filled steel tubular stub columns

Cited by 24 publications

References 38 publications

Analytical Modelling of LACFCST Stub Columns Subjected to Axial Compression

Analytical Modelling of LACFCST Stub Columns Subjected to Axial Compression

Performance and Capacity Calculation Methods of Self-Stressing Steel Slag Concrete Filled Steel Tubular Short Columns Subjected to Axial Load

Composite action of rectangular concrete‐filled steel tube columns under lateral shear force

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