Computers and Concrete

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Composite effects of circular concrete-filled steel tube columns under lateral shear load

  • Faxing Ding (School of Civil Engineering, Central South University) ;
  • Changbin Liao (School of Civil Engineering, Central South University) ;
  • Chang He (School of Civil Engineering, Central South University) ;
  • Wei Gao (School of Civil Engineering, Central South University) ;
  • Liping Wang (School of Civil Engineering, Central South University) ;
  • Fei Lyu (School of Civil Engineering, Central South University) ;
  • Yuanguang Qiu (China Railway Urban Construction Group Co., Ltd.) ;
  • Jianjun Yang (China Railway Urban Construction Group Co., Ltd.)
  • Received : 2022.01.06
  • Accepted : 2022.12.06
  • Published : 2023.02.25
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Abstract

To fully understand shear mechanisms and composite effects of circular concrete-filled steel tube (CFST) columns, systematic numerical investigations were conducted in this paper by improved finite element models. The triaxial plastic-damage constitutive model of the concrete and the interactions between the concrete and steel tube were considered. Afterwards, the critical and upper bound shear span ratios of the circular CFST column under lateral shear loading were determined. The composite effects between the two materials were analyzed by comparing the shear resistance with plain concrete column and hollow steel tube. In addition, a method that predicts the shear bearing capacity of a circular CFST column was proposed. The confining effects on the concrete core and the restraining effects on the steel tube were considered in this method. The proposed formula can predict more accurate results than the methods in different codes and references.

Keywords

Acknowledgement

This study was financially supported by the National Natural Science Foundation of China (Grant No. 51978664) and the Science Fund for Distinguished Young Scholars of Hunan (Grant No. 2019JJ20029). Both grants are greatly appreciated.

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