Steel and Composite Structures

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A numerical study on shear response of concrete-filled stainless steel tubes

  • Sina Kazemzadeh Azad (School of Civil Engineering, The University of Sydney) ;
  • Brian Uy (School of Civil Engineering, The University of Sydney)
  • Received : 2021.07.31
  • Accepted : 2023.07.04
  • Published : 2023.09.10
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Abstract

The number of studies investigating the response of concrete-filled tubes (CFTs) under shear has been very limited in the literature. This lack of research has been traditionally reflected in international design standards as rather conservative shear strength predictions for CFTs. The dearth of research on the shear response is even more pronounced for the case of concrete-filled stainless steel tubes (CFSSTs). In line with this, the present study investigates the shear response of circular and square CFSSTs using advanced finite element (FE) analysis. A thorough review of the previous studies on the shear response of carbon steel CFTs is provided along with a summary of past experimental programmes as well as the developed and codified design methods. A comprehensive numerical study is then conducted considering a wide range of circular and square, austenitic and lean duplex CFSSTs with different concrete infills and shear span-to-depth ratios. The effect of the tail length on the shear response is investigated and the minimum required tail length for achieving full shear capacity is established. The simulations are also used to highlight the importance of the dilation of the concrete core in the shear response of concrete-filled tubes and its relationship with the utilised boundary conditions. Furthermore, the numerical results are compared in detail with the predictions of design approaches developed previously for carbon steel CFTs and their accuracy and applicability to the stainless steel counterpart are demonstrated and recommendations are made accordingly.

Keywords

Acknowledgement

The study was supported by the Australian Research Council (ARC) through projects DP180100418 and LP160101484. The authors also acknowledge the technical support of the Sydney Informatics Hub (SIH) in facilitating access to Artemis, the high performance computing cluster of the University of Sydney. The assistance of Dr Yuchen Song in translating parts of the Chinese design codes and papers is also gratefully acknowledged.

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