Steel and Composite Structures

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A numerical investigation of the tensile behavior of the thread-fixed one-side bolted T-stubs at high temperature

  • You, Yang (School of Transportation and Civil Engineering, Shandong Jiaotong University) ;
  • Liu, Le (School of Civil Engineering, Shandong University) ;
  • Jin, Xiao (School of Civil Engineering, Shandong University) ;
  • Wang, Peijun (School of Civil Engineering, Shandong University) ;
  • Liu, Fangzhou (School of Civil Engineering, Shandong University)
  • Received : 2020.12.08
  • Accepted : 2022.11.15
  • Published : 2022.11.25
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Abstract

The tensile behavior of the Thread-fixed One-side Bolt (TOB) at high temperatures was studied using the Finite Element Modeling (FEM) to explore the structural responses that could not be measured in tests. The accuracy of the FEM was verified using the test results from the failure mode, load-displacement curve as well as yielding load. Three typical failure modes of TOB connected T-stubs were observed, which were the Flange Yielding (FY), the Bolt Failure (BF) and the Coupling Failure mode (CF). The influence of the flange thickness tb and the temperature θ on the tensile behavior of the T-stub were discussed. The initial stiffness and the yielding load decreased with the increase of the temperature. The T-stubs almost lost their resistance when the temperature exceeded 700℃. The failure modes of T-stubs were mainly decided by the flange thickness, which relates to the anchorage of the hole threads and the bending resistance of flange. The failure mode could also be changed by the high temperature. Design equations in EN 1993-1-8 were modified and verified by the FEM results. The results showed that these equations could predict the failure mode and the yielding load at different temperatures with satisfactory accuracy.

Keywords

Acknowledgement

The authors wish to acknowledge supports from the National Natural Science Foundation of China (51578322).

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