Abstract
This paper presents an experimental evaluation for comparison of the behaviors of stud and Perfobond shear connectors under static and fatigue loading based on 20 push-out tests. The push-out tests for each type of shear connectors including three series: static tests, fatigue endurance tests and residual mechanical properties test, respectively. In static tests, the failure modes of two types of connectors are different. The elastic stiffness and ultimate slip in the load-slip curves of the Perfobond are larger than that of stud. In fatigue endurance tests, the fatigue life of the studs is 2.68 million, while the Perfobond specimens do not fail after 3.0 million numbers of cycles under the same test conditions as studs’. Compared with the stud, the relative-slip of Perfobond increased sharply in the early period. In residual mechanical properties tests, the residual bearing capacity, shear stiffness and ductility are presented and discussed. The variation rules of these three indexes for two types of connectors are the same, while the indexes of Perfobond are much larger than stud’s throughout the process. The results indicate that Perfobond connector has good ductility, better fatigue resistance and higher safety reliability. However, the economy of Perfobond connectors is not as good as studs’.
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