Review on Shear Performance of Anchor Bolt in Post-anchoring Technology

Post-anchoring technology is the key means of building structure reinforcement and reconstruction, and the shear performance of anchor bolt directly affects the structural safety. This paper systematically reviews the research results on the shear performance of anchor bolts at home and abroad, and focuses on the shear mechanism and test findings of planting bars, chemical anchor bolts, embedded parts and direct shear anchor bolts. The domestic research reveals the influence of connection mode and thread shape on the cooperative force of group anchors through comparative tests. It shows that the shear performance of the anchorage nut fixation method is better, and the stiffness of the direct shear anchor bolt is more than 3 times that of the ordinary anchor bolt. The foreign research established the standard system earlier, and put forward the concrete cone failure model and the multi-stage stress theory. At the same time, the key influencing factors such as anchor bolt diameter, embedded depth and edge distance are summarized, and the differences between Chinese and foreign standard calculation methods are compared. The shortcomings of current research in complex environmental adaptability and group anchor coordination mechanism are pointed out, and the future research direction is prospected. This paper provides a reference for the engineering application and academic research of post-anchoring technology.