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Numerical Study on Stress Intensity Factors for Stud Connectors of Steel–Concrete Connection
Da Wang,Benkun Tan,Lei Wang,Fanghuai Chen,Shengtao Xiang 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.5
The fatigue fracture of the stud connector is the main failure mode of the steel–concrete composite structure. Fatigue assessment of cracked stud connectors with weld details is conducted in this study by using the linear elastic fracture mechanics approach. The mixed-mode stress intensity factor is calculated by the M -integral method, and the relative crack position h c is considered. First, a 3D fi nite element model of the push-out test with stud welding details is proposed in this study, and the load–slip curve and stress distribution of the stud connector were analyzed. Then, the mixed-mode stress intensity factor was calculated by defi ning the sub-model with cracks, and the infl uence coeffi cient of the mixed-mode stress intensity factor was investigated. The important infl uencing parameters, which include the crack aspect ratio, relative crack height, stud diameter, and stud height, are combined for calculation. The mixed-mode stress intensity factor of the stud is dominated by mode I (open). The infl uence of the stud height is not observed. However, the stress intensity factor of the crack tip gradually increases with the stud diameter. The study also found the infl uence of the crack shape under various conditions. The results of this study can be used by researchers to evaluate the fatigue fracture conditions of stud connectors.
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