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Seismic performance and damage evaluation of concrete-encased CFST composite columns subjected to different loading systems

  • Xiaojun Ke (College of Civil Engineering and Architecture, Guangxi University) ;
  • Haibin Wei (College of Civil Engineering and Architecture, Guangxi University) ;
  • Linjie Yang (College of Civil Engineering and Architecture, Guangxi University) ;
  • Jin An (College of Civil Engineering and Architecture, Guangxi University)
  • Received : 2022.02.15
  • Accepted : 2023.03.06
  • Published : 2023.04.10

Abstract

This paper tested 11 concrete-encased concrete-filled steel tube (CFST) composite columns and one reinforced concrete column under combined axial compression and lateral loads. The primary parameters, including the loading system, axial compression ratio, volume stirrup ratio, diameter-to-thickness ratio of the steel tube, and stirrup form, were varied. The influence of the parameters on the failure mode, strength, ductility, energy dissipation, strength degradation, and damage evolution of the composite columns were revealed. Moreover, a two-parameter nonlinear seismic damage model for composite columns was established, which can reflect the degree and development process of the seismic damage. In addition, the relationships among the inter-story drift ratio, damage index and seismic performance level of composite columns were established to provide a theoretical basis for seismic performance design and damage assessments.

Keywords

Acknowledgement

This work is supported by the National Natural Science Foundation of China (Project No. 51508112 and 51668007), and the Natural Science Foundation of Guangxi (Project No. 2018GXNSFAA050007). The financial support is gratefully acknowledged.

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