Steel and Composite Structures

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Behaviors of UHPC-filled Q960 high strength steel tubes under low-temperature compression

  • Yan, Jia-Bao (Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University) ;
  • Hu, Shunnian (School of Civil Engineering, Tianjin University) ;
  • Luo, Yan-Li (Architectural Engineering Institute IV, Automotive Engineering Corporation) ;
  • Lin, Xuchuan (Architectural Engineering Institute IV, Automotive Engineering Corporation) ;
  • Luo, Yun-Biao (Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University) ;
  • Zhang, Lingxin (Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, CEA)
  • Received : 2021.10.20
  • Accepted : 2022.04.12
  • Published : 2022.04.25
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Abstract

This paper firstly proposed high performance composite columns for cold-region infrastructures using ultra-high performance concrete (UHPC) and ultra-high strength steel (UHSS) Q960E. Then, 24 square UHPC-filled UHSS tubes (UHSTCs) at low temperatures of -80, -60, -30, and 30℃ were performed under axial loads. The key influencing parameters on axial compression performance of UHSS were studied, i.e., temperature level and UHSS-tube wall thickness (t). In addition, mechanical properties of Q960E at low temperatures were also studied. Test results revealed low temperatures improved the yield/ultimate strength of Q960E. Axial compression tests on UHSTCs revealed that the dropping environmental temperature increased the compression strength and stiffness, but compromised the ductility of UHSTCs; increasing t significantly increased the strength, stiffness, and ductility of UHSTCs. This study developed numerical and theoretical models to reproduce axial compression performances of UHSTCs at low temperatures. Validations against 24 tests proved that both two methods provided reasonable simulations on axial compression performance of UHSTCs. Finally, simplified theoretical models (STMs) and modified prediction equations in AISC 360, ACI 318, and Eurocode 4 were developed to estimate the axial load capacity of UHSTCs at low temperatures.

Keywords

Acknowledgement

The authors would like to acknowledge National Natural Science Foundation of China (Grant No. 52178494) and Natural Science Foundation of Heilongjiang Province (Grant No. JQ2021E006). The authors gratefully express their gratitude for the financial supports.

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