Characteristics of bonded-in steel and carbonfibre- reinforced polymer (cfrp) plates into timber

Adhesives can be used to form load-bearing joints in timber structures,both in repair and in new-build applications. one of the methods of making joints is to use rods or dowels orplates,bonded into pre-drilled holes in timber elements using structural adhesive for transferring structuralloads between such elements. an adhesive is expected to hold materials together and transfer designloads from one adherend to another within a given service environment for the life of the structure. thebehaviour of the joints depends on many parameters such as glue-line thickness,types of rods and types ofadherends. this paper reports the behaviour of bonded-in joint by varying the plate (steel and carbon-fibrereinforcedpolymer (cfrp) plates and timber (keruing and kempas) types. to characterise the performanceof the bonded-in joints,a series of test were conducted,namely,pull-out and block shear tests. as strengthproperties of the joint were greatly affected by the adhesive,mechanical properties of the adhesives werealso determined by conducting flexural and tensile as well as contact angle tests in order to determine theadhesion characteristics. results showed that the shear strength of bonded-in joint using cfrp plate washigher than that using steel plate. © forest research institute malaysia.