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Numerical Analysis and Axial Bearing Capacity of Composite Columns with Recycled Aggregate Concrete-Filled Steel Tube and Profile Steel

  • Research Article - Civil Engineering
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Abstract

The axial compressive behavior of composite columns with recycled aggregate concrete (RAC)-filled steel tube and profile steel was examined through numerical investigations. The constitutive models of the RAC material, profile steel, and steel tube were assigned to respective elements in the columns. The experimental results were used to verify the finite element (FE) model. Results indicated that the FE model accurately predicts the deformation, stress, and load–strain curves of the columns. Then, the effects of RAC strength, steel tube strength, profile steel strength, profile steel ratio, and diameter-to-thickness ratio on the axial compressive behavior of the columns were evaluated through a parametric study. The increase in RAC strength, steel tube strength, and profile steel strength significantly affected the axial bearing capacities of the columns. However, deformation ability and ductility decreased gradually as the RAC strength and steel strength increased. The increase in the diameter-to-thickness ratio had a negative effect on the axial bearing capacities of the long columns. Based on the experimental research, FE analysis, and ultimate analysis method, a formula for the axial bearing capacity of the composite columns was proposed. The validity of the proposed formula was verified through the comparison of the results. The research conclusions can provide a reference for the design of composite columns.

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Abbreviations

RAC:

Recycled aggregate concrete

RCA:

Recycled coarse aggregate

FE:

Finite element

SRRC:

Steel-reinforced recycled concrete

r :

RCA replacement percentage

H :

Column height

t :

Wall thickness

D/t :

Diameter thickness ratio

ρ :

Profile steel ratio

f rc :

Uniaxial compressive strength

E rc :

Elastic modulus of recycled concrete

E s :

Elastic modulus of steel products

N n :

Calculated value of axial bearing capacity of the columns

N t :

Test value of axial bearing capacity of the columns

f p :

Proportional limits of the elastic stage of steel

f y :

Yield strength of steel

f u :

Ultimate tensile strength of steel

σ s :

Stress of steel

E s :

Elastic modulus of steel

ε :

Strain of steel or RAC

A, B, C :

Coefficients on steel material

ε 0 :

Peak strain

f c :

Axial compressive strength of the RAC material

a, b :

Corresponding parameters on RAC material

σ t1 :

Longitudinal stress of the steel tube

σ t2 :

Circumferential stress of the steel tube

p :

Lateral pressure between the steel tube and RAC

f ty :

Yield strength of the steel tube

d :

Inner diameter of the steel tube

f sy :

Yield strength of the profile steel

f *rc :

Compressive strength of RAC under a three-way stress state

σ rc :

Compressive stress of RAC under three-way stress state

θ :

Confining factor

ζ :

Profile steel index

A t :

Area of steel tube

A s :

Area of profile steel

A c :

Area of RAC

η :

Reduction factor of the axial bearing capacity of the RCA replacement percentage

φ :

Reduction coefficient of the axial bearing capacity of slenderness ratio

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Acknowledgements

The research was mainly financially supported by the National Natural Science Foundation of China P.R. (No. 51408485), China Postdoctoral Science Foundation Funded Project (No. 2015M572584), the Plan Projects of the Department of Housing and Urban–Rural Development of Shaanxi Province (No. 2015-K129), the Funded Project of Youth Science and Technology New Star of Xi’an University of Technology, Scientific Research Project of Xi’an University of Technology (2016CX028), which is gratefully acknowledged.

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Authors and Affiliations

  1. School of Civil Engineering and Architecture, Xi’an University of Technology, Xi’an, China

    Jing Dong, Hui Ma, Yunhe Liu & Tingting Guo

  2. State Key Laboratory of Eco-hydraulic Engineering in Arid Area, Xi’an University of Technology, Xi’an, China

    Hui Ma & Yunhe Liu

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  1. Jing Dong
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  2. Hui Ma
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Correspondence to Jing Dong.

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Dong, J., Ma, H., Liu, Y. et al. Numerical Analysis and Axial Bearing Capacity of Composite Columns with Recycled Aggregate Concrete-Filled Steel Tube and Profile Steel. Arab J Sci Eng 45, 3581–3598 (2020). https://doi.org/10.1007/s13369-019-04169-y

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