Techno Press


Steel and Composite Structures   Volume 23, Number 2, February10 2017, pages 239-250
DOI: http://dx.doi.org/10.12989/scs.2017.23.2.239
 
Deterioration in strength of studs based on two-parameter fatigue failure criterion
Bing Wang, Qiao Huang and Xiaoling Liu

 
Abstract     [Full Text]
    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.
 
Key Words
    steel-concrete composite bridge; stud connector; fatigue; residual strength; two-parameter fatigue failure criterion
 
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