Steel and Composite Structures

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Deterioration in strength of studs based on two-parameter fatigue failure criterion

  • Wang, Bing (School of Transportation, Southeast University) ;
  • Huang, Qiao (School of Transportation, Southeast University) ;
  • Liu, Xiaoling (School of Transportation, Southeast University)
  • Received : 2016.07.07
  • Accepted : 2016.12.26
  • Published : 2017.02.10
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Abstract

In the concept of two-parameter fatigue failure criterion, the material fatigue failure is determined by the damage degree and the current stress level. Based on this viewpoint, a residual strength degradation model for stud shear connectors under fatigue loads is proposed in this study. First, existing residual strength degradation models and test data are summarized. Next, three series of 11 push-out specimen tests according to the standard push-out test method in Eurocode-4 are performed: the static strength test, the fatigue endurance test and the residual strength test. By introducing the "two-parameter fatigue failure criterion," a residual strength calculation model after cyclic loading is derived, considering the nonlinear fatigue damage and the current stress condition. The parameters are achieved by fitting the data from this study and some literature data. Finally, through verification using several literature reports, the results show that the model can better describe the strength degradation law of stud connectors.

Keywords

Acknowledgement

Supported by : Natural Science Foundation

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