Fatigue Behaviour Study of the Shear Stud Using Crack Box Technology and M Integral Method

Steel and concrete composite structures can give full play to mechanical advantages of the two materials, so it is widely used all over the world. As the key components to ensure the compatibility deformation of two materials, the importance of shear studs to the security of structures is self-evident. However, fatigue research on shear studs is still lagging behind, and there is a potential safety hazard. Thus, based on crack box technique, the M integral and the maximum tangential stress criterion, this paper presents a simulation method for fatigue crack propagation of studs in three-dimensional mixed fracture mode. The crack propagation of Type A fracture in studs is simulated under fatigue load of constant slip between steel and concrete. Results show that the crack deflection angle of stud increases with slip effect. In crack propagation process, the stress intensity factor KI is the highest and KIII is the smallest, whose effect on the deflection angle during crack propagation can be reasonably ignored. The crack surface inclines slightly to the bottom of welding collar while the crack expands in the stud.