Interface Shear Analysis of UHPC‐NC with U‐Shaped Shear Stud

The composite structure composed of ultra‐high performance concrete (UHPC) and normal concrete (NC) has been widely applied to engineering structures. U‐shaped shear studs play an important role in the combination of the UHPC‐NC interface. To investigate the interface shear characteristics of UHPC‐NC with U‐shaped shear studs, the numerical model with 14 various parameters is calculated based on the interface push tests. The influences of diameter, stud number, NC elastic modulus, NC compressive strength on the shear characteristics of the UHPC‐NC interface are analyzed. The results show that the load‐slip curves of the UHPC‐NC interface with a U‐shaped shear stud have three stages: elastic stage, elastoplastic stage and descending stage. The fitting formula with the power function as the basic function can well express the influence law of diameter on the interface shear capacity. The interface shear capacity is not sensitive to the elastic modulus and compressive strength of NC, and it does not increase or decrease with the increase of stud number, the shear strength of a single stud tends to be constant.