UBC Theses and Dissertations
Glulam connections using epoxy glued-in rebars Wiktor, Robert
This thesis is a part of the research aimed at developing a reliable moment resisting connection method for timber structures based on gluing the reinforcing bars to the wood. The aims of this thesis are: to investigate the influence of atmospheric factors (such as moisture and temperature) on the performance of the glued-in rebar joints, to examine the possibility of increasing the bearing resistance of the glulam (compression per pendicular to the grain) by gluing the rebars perpendicularly to the grain, to implement the glued-in rebar technique in creating a moment resisting joint of a statically indeterminate glulam frame for a multi-storey building, to provide the designers of timber buildings with information on how to design the glued-in rebar joints, to verify the possible savings derived from the use ofthe moment resistingjoints in glulam frames. The findings of this research are: the glued-in rebar connection may be considered reliable in the temperature and moisture conditions which can occur in the building; the connection was found to be influenced by those conditions to a lesser degree than the glulam structure itself, the gluing of the rebars under the bearing plates can increase the compressive resistance of the glulam in the direction perpendicular to the grain by 100%, the rebars glued perpendicularly to the grain have an additional effect of increasing the shear capacity of the glulam members, full size beam-to-columnjoints using the glued-in rebar idea were tested; the connection proved to have bending and shear resistance equal or greater than the resistance of the glulam members which were joined, a ductile behaviour of the beam-to-column connections was observed prior to the failures, a set ofguidelines was developed to facilitate the design ofglued-in rebar joints in the multi-storey timber frames, by using moment resisting glued-in rebar connections it is possible to save 15% of the glulam volume versus the traditional hinged frame design.
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