Structural Engineering and Mechanics

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Bond behavior between circular steel tube and high-strength concrete after elevated temperatures

  • Ji, Zhou (College of Civil Engineering and Architecture, Guangxi University) ;
  • Zongping, Chen (College of Civil Engineering and Architecture, Guangxi University) ;
  • Maogen, Ban (College of Civil Engineering and Architecture, Guangxi University) ;
  • Yunsheng, Pang (College of Civil Engineering and Architecture, Guangxi University)
  • Received : 2022.09.03
  • Accepted : 2022.10.28
  • Published : 2022.12.10
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Abstract

In this paper, bond-slip behavior of high strength concrete filled circular steel tube (HSCFCST) after elevated temperatures treatment was studied. 17 specimens were designed for push-out test. The influence was discussed as following parameters: (a) concrete strength, (b) constant temperature, and (c) bond length. The results showed that (1) after elevated temperatures treatment, the bond strength of the HSCFCST specimens increased first and then decreased with temperature rising; (2) the bond strength increased with the increase of concrete strength at room temperature, while the influence subsided after elevated temperatures treatment; (3) the strain of the circular steel tube was distributed exponentially along its length, the stress changed from exponential distribution to uniform distribution with the increase of load; (4) the bond damage process was postponed with the increase of constant temperature; and (5) the energy consumption capacity of the bonding interface increased with the rise of concrete strength and constant temperature. Moreover, computational formulas of ultimate and residual bond strength were obtained by regression, and the bond-slip constitutive models of HSCFCSTs after elevated temperatures was established.

Keywords

Acknowledgement

The research described in this paper was financially supported by the National Natural Science Foundation of China (Nos. 51578163 and 52220105005), Bagui Scholars Special Funding Project ((2019) No.79), Guangxi Science and Techonology Base and Talent Special Project (AD21075031), Projects Funded by the Central Government to Guide Local Scientific and Technological Development (ZY21195010), Guangxi Key R & D Plan (AB21220012), Major Projects of Nanning Scientific Research and Technological Development Plan (20223024) and Innovation Project of Guangxi Graduate Education (YCBZ2021020).

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