Structural Engineering and Mechanics

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Experimental and numerical investigation on the behavior of concrete-filled rectangular steel tubes under bending

  • Zhang, Tao (School of Civil Architecture, Zhengzhou University of Aeronautics) ;
  • Gong, Yong-zhi (School of Civil Engineering, Central South University) ;
  • Ding, Fa-xing (School of Civil Engineering, Central South University) ;
  • Liu, Xue-mei (Department of Infrastructure Engineering, University of Melbourne) ;
  • Yu, Zhi-wu (School of Civil Engineering, Central South University)
  • Received : 2020.06.23
  • Accepted : 2021.02.19
  • Published : 2021.05.10
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Abstract

Pure bending loading conditions are not frequently occurred in practical engineering, but the flexural researches are important since it's the basis of mechanical property researches under complex loading. Hence, the objective of this paper is to investigate the flexural behavior of concrete-filled rectangular steel tube (CFRT) through combined experimental and numerical studies. Flexural tests were conducted to investigate the mechanical performance of CFRT under bending. The load vs. deflection curves during the loading process was analyzed in detail. All the specimens behaved in a very ductile manner. Besides, based on the experimental result, the composite action between the steel tube and core concrete was studies and examined. Furthermore, the feasibility and accuracy of the numerical method was verified by comparing the computed results with experimental observations. The full curves analysis on the moment vs. curvature curves was further conducted, where the development of the stress and strain redistribution in the steel tube and core concrete was clarified comprehensively. It should be noted that there existed bond slip between the core concrete and steel tube during the loading process. And then, an extensive parametric study, including the steel strength, concrete strength, steel ratio and aspect ratio, was performed. Finally, design formula to calculate the ultimate moment and flexural stiffness of CFRTs were presented. The predicted results showed satisfactory agreement with the experimental and FE results. Additionally, the difference between the experimental/FE and predicted results using the related design codes were illustrated.

Keywords

Acknowledgement

This research work is financially supported by the Key scientific research projects of colleges and universities in Henan Province (Grant No. 21a560015), National Natural Science Foundation of China (Grant No. 51978664 and 51708514), and National Key Research program of China (Grant No.2017YFC0703404). The experiments are conducted in National Engineering Laboratory for High Speed Railway Construction at Central South University. The support is gratefully acknowledged.

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