ABSTRACT
A welded-bolted hybrid demountable shear connector was proposed for use in steel-concrete composite buildings and bridges. According to Eurocode 4, four standard push-out static tests and four high-cycle fatigue tests were carried out to assess the structural performance of the hybrid connector, respectively. The experimental results show that the initial stiffness, shear resistance, and slip capacity of the proposed connector are higher than those of traditional welded studs. The hybrid connector can be regarded as a ductile connector with a slip capacity higher than 6 mm. Moreover, the primary fatigue failure mode observed was stud fracture at the base. The presence of grout inside the tube significantly increased the WDSC’s fatigue life by 5.4 times. The study also analyzed stiffness degradation and relative slip evolution during fatigue cycles. All the findings from present investigation may provide reference for the application of proposed demountable shear connector in sustainable steel-concrete structures.
