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Brandon, Rossi

University of British Columbia

Mass timber structures are becoming a major structural system throughout Canada, and globally. Glulam braced frames are one of these mass timber structural systems that can be used in high seismic zones. Currently, the National Building Code of Canada (NBCC) provides ductility and overstrength factors for glulam braced frames and directs designers to Canadian Standards Association (CSA) O86, to design glulam braces to achieve adequate levels of ductility and overstrength. However, CSA O86 lacks the detailed design requirements, therefore limited applications have been used. Bolted connections are a topic that has already been studied, but in traditional testing methods a single critical connection is tested with another overdesigned connection, so the behaviour of only one connection is studied. In glulam braces, identical connections are typically used at each end of the brace. Therefore, the total behaviour of both connections is unknown when one connection fails before the other, due to material variability. The failed connection will undergo significant plastic deformations, while the second connection may not experience the same level of damage. In this thesis, two bolted end-plate connections in glulam braces are studied under cyclic axial loads to gain an in-depth understanding of the structural properties and failure mechanisms. A total of forty-five specimens were tested consisting of fifteen sets with five varying parameters, including the number of bolts, diameter of the bolts, bolt spacing and end distance, and wood density. For every specimen, the hysteresis loops were analyzed to develop the following properties: envelope curves, maximum, ultimate, and yield points, overstrength, elastic stiffness, and ductility.

Text

2024-04-23

Attribution-NoDerivatives 4.0 International

http://hdl.handle.net/2429/87934

Civil Engineering

University of British Columbia

UBCV

http://creativecommons.org/licenses/by-nd/4.0/