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Development of a novel light-frame wood panelized roof system
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- Author / Creator
- Islam, Md Saiful
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Panelized fabrication of light-frame wood buildings has higher productivity than the traditional stick-built method. However, the roof production process is inefficient due to the structural system and construction method. This research proposes a novel roof system to improve the productivity of the panelized construction process for light-frame wood residential building fabrication. The system includes several roof components, such as ceiling frames, roof panels and support walls designed to comply with structural requirements, manufacturing efficiency, and on-site installation factors. A case study of the gable roof of a two-story building demonstrates the implementation of this system. Ceiling frames can be fabricated using three options in the current offsite setting. Meanwhile, roof panels can be produced in the wall line without altering existing processes. The design requirements for the roof panels were determined based on nail connection tests and finite element analysis. The most critical factor for successfully implementing this panelized roof system is efficient connections. Therefore, self-tapping screws were explored to connect the roof assembly components. An experimental study on timber screw connections was conducted to determine the short-term mechanical performance of five different connection configurations. This data was used to develop a numerical model of the novel roof assembly. The study also invented a novel apex connection to facilitate a folding mechanism in the panelized light-frame wood roof system. Proof of concept of the proposed connection assembly was presented by a 3D printout of the developed connection. Following the steel design and timber codes, the initial estimation of different parameters, such as the pinhole diameter and number of screws, was established. A detailed finite element analysis was performed to determine the connection strength requirement for different load case scenarios. The analysis and 3D printout demonstrated that the proposed connection could provide the required folding mechanism before roof installation and withstand the load in the unfolding state at service. Finally, a three-dimensional finite-element analysis of the proposed light-frame wood panelized gable roof was performed. Macro elements representing the major roof components were developed using analytical models of the diaphragm and shear wall. The most critical load response of the panelized roof was obtained by considering the governing load cases, including the partial load case for snow load. The load path analysis revealed that the panelized roof had a two-way load distribution due to the deep beam action of the support wall. The study also revealed the replicability of this holistic approach to other offsite facilities. A feasibility study shows that this roof system could be a potential solution to building homes offsite for remote locations such as Northern Canada.
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- Graduation date
- Fall 2023
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- Type of Item
- Thesis
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- Degree
- Doctor of Philosophy
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- License
- This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.