混凝土模块结构水平缝螺栓连接锚固侧节点受拉性能试验研究OA

To enhance the construction efficiency and connection reliability of precast concrete modular structures,a experimental study was conducted on the tensile performance of anchor-side horizontal bolted joints in a fully assembled modular concrete structural system using through-bolts(FAMC-RC).Two groups 12 specimens with embedded threaded sleeves were designed and tested,considering key influencing factors including sleeve embedment depth,component thickness,concrete strength,and the presence of U-shaped reinforcing bars.The results show that the failure modes include concrete cone failure,sleeve pull-out failure and combined failure.Increasing the sleeve embedment depth significantly enlarges the concrete failure cone and lead to an accelerated increase in peak load capacity.Greater component thickness effectively improves both load capacity and initial stiffness while influencing the failure mode.The use of high-strength concrete,such as UHPC,considerably enhances the joint's peak load and ductility,shifting the failure mode from combined failure to sleeve pullout failure.Pre-embedded U-shaped bars notably increase load capacity and stiffness in thin-wall specimens,whereas in thick foundations they primarily serve for detailing and crack control.The research can be used for optimizing joint design and application in modular precast concrete structures.