Study on bond-slip law of glulam connection with glued-in rebar with consideration of location function

Glued-in rebar technology is a new type of timber connecting technology characterized by high load-carrying capacity, high stiffness, improved aesthetic appearance and good fire resistance, which has been successfully used in the construction of timber buildings and bridges. Glued-in rebar in timber is similar to the post-installed rebar in concrete, in which three types of materials and two interfaces were involved. Bond behavior between glued-in rebar and timber is an issue of bond among several mediums. For good structural performance, material properties of glued-in rebar timber connection should be guaranteed. Furthermore, good bond performance at different interfaces is required. In this paper, based on the tri-linear bond-slip model, the closed-form solutions of axial stress of glued-in rebar, interfacial bond stress and relative slip were obtained by theoretical derivation and were then compared with the experimental results. The results showed that theoretical values fit the experimental data well. Distribution of bond stress and relative slip along the anchorage length were analyzed using the strains of glued-in rebar and the relative slip at the loaded end recorded during the testing. Finally, the bond-slip relationship for glued-in rebar glulam connection related to location function was established.