碳纤维增强胶合木钢填板螺栓连接节点横纹受力性能研究

Bolted glulam connections with slotted-in steel plates are prone to brittle failure under loading. In order to study the bearing capacity, deformation performance and failure modes of the bolted glulam connections with slotted-in steel plates reinforced by carbon fiber, considering the laying position and number of layers, the dowel bearing strength test was carried out. Then, taking the bolt end distance, middle distance, number, arrangement and reinforce mode as parameters, tension test of the connections perpendicular to grain and finite element analysis were carried out. Test results show that the dowel bearing strength can be increased by 171% and the dispersion coefficient can be reduced by 84% when reinforced by two or four layers carbon fiber in two or four sides. The failure mode of the CFRP reinforced joint is changed from brittle fracture to ductile failure after fiber reinforcing, the ultimate load and displacement ductility factor increase by 181% and 625% maximumly. The edge and middle distance of the bolted joint can be appropriately reduced after reinforcement. The formulas of the dowel bearing strength after CFRP reinforcing and the bearing capacity of CFRP reinforced bolted glulam connections with slotted-in steel plates are given, which can provide reference for engineering design.