Steel and Composite Structures

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Buckling resistance behavior of WGJ420 fire-resistant weathering steel columns under fire

  • Yiran Wu (Department of Civil Engineering, Tsinghua University) ;
  • Xianglin Yu (Department of Civil Engineering, Tsinghua University) ;
  • Yongjiu Shi (Department of Civil Engineering, Tsinghua University) ;
  • Yonglei Xu (Department of Civil Engineering, Tsinghua University) ;
  • Huiyong Ban (Department of Civil Engineering, Tsinghua University)
  • Received : 2022.01.01
  • Accepted : 2023.03.29
  • Published : 2023.04.25
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Abstract

The WGJ420 fire-resistant weathering (FRW) steel is developed and manufactured with standard yield strength of 420 MPa at room temperature, which is expected to significantly enhance the performance of steel structures with excellent fire and corrosion resistances, strong seismic capacity, high strength and ductility, good resilience and robustness. In this paper, the mechanical properties of FRW steel plates and buckling behavior of columns are investigated through tests at elevated temperatures. The stress-strain curves, mechanical properties of FRW steel such as modulus of elasticity, proof strength, tensile strength, as well as corresponding reduction factors are obtained and discussed. The recommended constitutive model based on the Ramberg-Osgood relationship, as well as the relevant formulas for mechanical properties are proposed, which provide fundamental mechanical parameters and references. A total of 12 FRW steel welded I-section columns with different slenderness ratios and buckling load ratios are tested under standard fire to understand the global buckling behavior in-depth. The influences of boundary conditions on the buckling failure modes as well as the critical temperatures are also investigated. In addition, the temperature distributions at different sections/locations of the columns are obtained. It is found that the buckling deformation curve can be divided into four stages: initial expansion stage, stable stage, compression stage and failure stage. The fire test results concluded that the residual buckling capacities of FRW steel columns are substantially higher than the conventional steel columns at elevated temperatures. Furthermore, the numerical results show good agreement with the fire test results in terms of the critical temperature and maximum axial elongation. Finally, the critical temperatures between the numerical results and various code/standard curves (GB 51249, Eurocode 3, AS 4100, BS 5950 and AISC) are compared and verified both in the buckling resistance domain and in the temperature domain. It is demonstrated that the FRW steel columns have sufficient safety redundancy for fire resistance when they are designed according to current codes or standards.

Keywords

Acknowledgement

The authors sincerely acknowledge the financial support of the National Natural Science Foundation of China (Grant No. 52078276 and 51890903). Special gratitude is also extended to the pertinent technicians and experts from the Civil Engineering Laboratory of Huaqiao University for providing essential assistance during the column fire tests. The authors also highly appreciate Wuhan Iron and Steel Company for their great efforts in manufacturing the fire-resistant steels and processing the test specimens. Any opinions, discoveries and conclusions or recommendations in this paper are those of the authors and do not necessarily represent the viewpoints of the National Natural Science Foundation.

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