Steel and Composite Structures

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Behaviors of RPC-filled double skin steel tubular stub columns under axial compression loading

  • Hao, Wenming (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Xie, Qifang (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Zhang, Yun (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Xu, Dunfeng (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Zhang, Zhitian (Hengsheng Electric Power Development Co., Ltd.)
  • Received : 2020.03.04
  • Accepted : 2021.07.28
  • Published : 2021.09.25
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Abstract

This paper presents the compressive behaviors of RPC-filled double skin steel tubular (RFDST) stub columns. Six RFDST stub column specimens, with different hollow ratios and constraint coefficients, were tested under axial compression loading. The compressive behaviors, such as failure mode, strength and ductility, were analyzed. It is found that the failure mode of RPC filled steel tube (RFST) stub column is shear failure, while RFDST stub columns are waist drum failure. The load deformation curves of RFDST specimens with different hollow ratio and constraint coefficient show different characteristics. RFDST specimens exhibit high bearing capacity and good ductility. Based on the test results of existing RFDST stub columns, a design formula for predicting the ultimate bearing capacity is given. A finite element model is also presented to analyze the compressive behaviors, and good agreement is obtained. The influences of hollow ratio and constraint coefficient on the ultimate bearing capacity are discussed.

Keywords

Acknowledgement

The authors of this paper gratefully acknowledge the funding support received from the National Natural Science Foundation of China (Grant No. 51878550), the Shaanxi Natural Science Basic Research Program (No. 2021JC-44), the Project of State Key Laboratory of western green building (No. LSZZ202116). Gratitude is also extended to all members of the State Key Laboratory of Green Building in Western China of XAUAT.

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