Glued-in joints have several advantages with respect to the traditional mechanical connections generally
used in beam design, such as higher stiffness, more uniform stress distribution, less bar corrosion problems and better
appearance. Systematic studies have been performed to predict the pull-out capacity of the bars in the last years. The
experimental tests presented in the paper were focused on the role of the steel strength and of the bar diameter to
determine a ductile collapse instead of a fragile splitting failure. The data showed the importance of the bond level
requested to yield the bars, which can remain under limit values, performed by timber elements, only for mild yield
steel and correlated bar diameters, especially in case of reduced edge distances, as it is necessary to respect in glulam
beams joints. Extensive experimental investigations with different strength steels, different bar diameters and different
edge distances were carried out on specimens with one, two or three threaded rods.
