Steel and Composite Structures

  • 제27권4호
  • /
  • Pages.509-523
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  • 2018
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Residual bond behavior of high strength concrete-filled square steel tube after elevated temperatures

  • Chen, Zongping (College of Civil Engineering and Architecture, Guangxi University) ;
  • Liu, Xiang (College of Civil Engineering and Architecture, Guangxi University) ;
  • Zhou, Wenxiang (College of Civil Engineering and Architecture, Guangxi University)
  • 투고 : 2017.01.16
  • 심사 : 2018.03.24
  • 발행 : 2018.05.25
⟨ 이전 논문 다음 논문 ⟩

초록

This paper presents experimental results on the residual bond-slip behavior of high strength concrete-filled square steel tube (HSCFST) after elevated temperatures. Three parameters were considered in this test: (a) temperature (i.e., $20^{\circ}C$, $200^{\circ}C$, $400^{\circ}C$, $600^{\circ}C$, $800^{\circ}C$); (b) concrete strength (i.e., C60, C70, C80); (c) anchorage length (i.e., 250 mm, 400 mm). A total of 17 HSCFST specimens were designed for push-out test after elevated temperatures. The load-slip curves at the loading end and free end were obtained, in addition, the distribution of steel tube strain and the bond stress along the anchorage length were analyzed. Test results show that the shape of load-slip curves at loading ends and free ends are similar. With the temperature constantly increasing, the bond strength of HSCFST increases first and then decreases; furthermore, the bond strength of HSCFCT proportionally increases with the anchoring length growing. Additionally, the higher the temperature is, the smaller and lower the bond damage develops. The energy dissipation capacity enhances with the concrete strength rasing, while, decreases with the temperature growing. What is more, the strain and stress of steel tubes are exponentially distributed, and decrease from the free end to loading end. According to experimental findings, constitutive formula of the bond slip of HSCFST experienced elevated temperatures is proposed, which fills well with test data.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

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피인용 문헌

  1. Residual Bond Behavior of Steel Reinforced Recycled Aggregate Concrete After Exposure to Elevated Temperatures vol.7, pp.None, 2018, https://doi.org/10.3389/fmats.2020.00142
  2. Residual Properties and Axial Bearing Capacity of Steel Reinforced Recycled Aggregate Concrete Column Exposed to Elevated Temperatures vol.7, pp.None, 2018, https://doi.org/10.3389/fmats.2020.00187
  3. Experimental and numerical investigation on post-earthquake fire behaviour of the circular concrete-filled steel tube columns vol.38, pp.1, 2018, https://doi.org/10.12989/scs.2021.38.1.017