Orthogonal Experimental Study of Wood Shear Performance of End U-shaped CFRP

In order to promote the application of CFRP in timber structure repair and reinforcement, this paper proposes an end U-type CFRP and conducts an orthogonal experimental study of shear performance under orthogonal experimental design conditions, which mainly takes into account the effects of shear length, shear surface height, angle of notched corners, width of specimen, shear thickness and number of CFRP layers. It was found that the U-shaped CFRP at the end could better retard the shear fracture characteristics of wood, and caused the shear load-displacement curve to show an obvious fracture failure transition phase. In addition, based on the orthogonal parametric analysis, the effects of each factor on the shear performance were obtained. The results show that each factor has a significant effect on the shear performance, and the number of CFRP layers and the angle of notched corners are the most significant, in which the shear performance increases with the number of CFRP layers and the angle of notched corners and tends to be relatively stable. It is recommended to pay special attention to the number of CFRP bonding layers and the bonding direction in the actual engineering application, so as to obtain a good performance and less consumable repair and reinforcement methods.