Tensile Performance Research of Self-tapping Screw Cluster Connection Joints
About the author:
1. College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China;2. Department of Civil Engineering, Tsinghua University, Beijing 100084, China
Abstract:
In order to investigate the tensile performance of self-tapping screw cluster connection joint inprefabricated concrete sandwich shear wall, 16 self-tapping screw cluster tensile connection componentswere designed and fabricated. The study examined the effects of screw arrangement, tensile reinforcementarea, self-tapping screw quantity and shear-to-tension ratio on their tensile performance. The researchshows that the tensile performance of the self-tapping screw cluster connection joint is not significantlyaffected by the layout of the screws. For the failure mode dominated by tensile reinforcement fracture, a33% augmentation in reinforcement area elevates the mean tensile capacity of screw cluster joints by47%. In contrast, under screw-dominated failure mechanisms, a 100% increment in screw quantityprovides a 30% capacity gain. Increasing the area of tensile reinforcement and the number of self-tappingscrews can both effectively enhance the stiffness during the mid-to-late stages. When the self-tappingscrew cluster connection joint adopts dense and fine self-tapping screw clusters, the tensile load-bearingcapacity exhibits a slight improvement. The finite element software ABAQUS was used to establish ananalytical model and to conduct parametric analysis. The self-tapping crew cluster connection joints entera critical failure state when the shear-to-tensile ratio ranges between 0.51 and 0.76.
