DOI QR코드

DOI QR Code

Ultra-low cycle fatigue tests of Class 1 H-shaped steel beams under cyclic pure bending

  • Zhao, Xianzhong (Deparment of Structural Engineering, Tongji University) ;
  • Tian, Yafeng (Deparment of Structural Engineering, Tongji University) ;
  • Jia, Liang-Jiu (Research Institute of Structural Engineering and Disaster Reduction, Tongji University) ;
  • Zhang, Tao (Deparment of Structural Engineering, Tongji University)
  • 투고 : 2017.09.09
  • 심사 : 2017.12.05
  • 발행 : 2018.02.25

초록

This paper presents experimental and numerical study on buckling behaviors and hysteretic performance of Class 1 H-shaped steel beam subjected to cyclic pure bending within the scope of ultra-low cycle fatigue (ULCF). A loading device was designed to achieve the pure bending loading condition and 4 H-shaped specimens with a small width-to-thickness ratio were tested under 4 different loading histories. The emphasis of this work is on the impacts induced by local buckling and subsequent ductile fracture. The experimental and numerical results indicate that the specimen failure is mainly induced by elasto-plastic local buckling, and is closely correlated with the plastic straining history. Compared with monotonic loading, the elasto-plastic local buckling can occur at a much smaller displacement amplitude due to a number of preceding plastic reversals with relative small strain amplitudes, which is mainly correlated with decreasing tangent modulus of the material under cyclic straining. Ductile fracture is found to be a secondary factor leading to deterioration of the load-carrying capacity. In addition, a new ULCF life evaluation method is proposed for the specimens using the concept of energy decomposition, where the cumulative plastic energy is classified into two categories as isotropic hardening and kinematic hardening correlated. A linear correlation between the two energies is found and formulated, which compares well with the experimental results.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

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