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Behaviour of recycled aggregate concrete filled stainless steel stub columns

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Abstract

Past research indicates that recycled aggregate concrete (RAC) could be successfully used in concrete-filled steel tubular (CFST) columns. Their yielded performance is almost as good as that of the traditional CFST columns. In addition, as a comparatively new construction material, stainless steel can be used to replace carbon steel for enhancing the durability and ductility of CFST columns. With an aim to combine the advantages of both RAC and stainless steel, RAC is proposed in this paper to be used as a filling material for stainless steel tubes. A test program is introduced in this paper to investigate the behaviour of RAC-filled stainless steel stub columns. For comparison purposes, reference specimens with carbon steel tubes are also tested. In the end, finite element analysis is conducted to simulate the current test results and those reported in the literature.

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Abbreviations

A c :

Cross-sectional area of concrete (mm2)

A s :

Cross-sectional area of steel (mm2)

B :

Width of the square or rectangular steel tube (mm)

D :

Diameter of the circular steel tube or depth of the rectangular steel tube (mm)

E c :

Elastic modulus of concrete (N/mm2)

E sc :

Initial elastic modulus of the composite column (N/mm2)

\( f^{\prime}_{\text{c}} \) :

Cylinder compressive strength of concrete (N/mm2)

f ck :

Characteristic concrete strength (=0.67f cu for normal strength of concrete, N/mm2)

f cu :

Compressive cube strength of concrete (N/mm2)

f y :

Yield strength of steel (N/mm2)

L :

Specimen length (mm)

N :

Axial load (kN)

N EC4 :

Predicted ultimate strength using Eurocode 4 (kN)

N uc :

FE predicted ultimate strength (kN)

N ue :

Ultimate strength of the column (kN)

γ :

Recycled aggregate replacement ratio (−)

SI :

Ratio of the compressive strength of a RACFST column to that of its reference normal CFST column (−)

t :

Wall thickness of the steel tube (mm)

ε :

Strain (10−6)

ε ue :

Axial strain at the peak load (10−6)

σ :

Stress (N/mm2)

ξ :

Confinement factor (−)

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Acknowledgments

This work is supported by the Australian Research Council (ARC) under its Future Fellowships scheme (Project No: FT0991433) and National Natural Science Foundation of China (NSFC) Research Fund for International Young Scientists (Project No: 51250110074). The financial support is gratefully acknowledged.

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Tam, V.W.Y., Wang, ZB. & Tao, Z. Behaviour of recycled aggregate concrete filled stainless steel stub columns. Mater Struct 47, 293–310 (2014). https://doi.org/10.1617/s11527-013-0061-1

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