Steel and Composite Structures

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Flexural performance of double skin composite beams at the Arctic low temperature

  • Yan, Jia-Bao (School of Civil Engineering / Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University) ;
  • Dong, Xin (School of Civil Engineering / Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University) ;
  • Wang, Tao (Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics)
  • Received : 2019.11.09
  • Accepted : 2020.11.09
  • Published : 2020.11.25
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Abstract

This paper presents the flexural performance of double skin composite beams (DSCBs) at different Arctic low temperatures. 12 DSCBs were prepared and tested under two-point loading at different Arctic low temperatures of 20, -30, -50, and -70℃. The studied parameters include low-temperature level (T), steel-faceplate thickness (t), shear span ratio (λ), and spacing of headed studs (S). The experimental investigations under two-point loading tests showed that flexural failure occurred to all DSCBs, even including the specimen designed with the small λ ratio of 2.9. The ultimate strength behaviours of DSCBs were improved due to the improved mechanical properties of constructional materials and the confinement on shear connectors. The DSCB subjected to two-point loading and low temperatures exhibits a five-stage working mechanism. The stiffness and strength indexes of DSCBs increase linearly with temperature and t value increasing, while decreasing as shear span ratio boosts. In the contrast, the change of S value from 150 to 200 mm has little effect on the ultimate strength behavior of DSCB.

Keywords

Acknowledgement

The authors would like to acknowledge Peiyang Scholar Foundation (grant no. 2019XRX-0026) under Reserved Academic Program from Tianjin University for the works reported herein. The authors gratefully express their gratitude for the financial supports.

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