Thesis
Investigation into the effects of variable row spacing in bolted timber connections subjected to reverse cyclic loading
Washington State University
Master of Science (MS), Washington State University
2006
Handle:
https://hdl.handle.net/2376/102173
Abstract
The effects of variable row spacing in single-shear bolted timber connections subjected to reverse cyclic loading have been determined through this experimental research. A variety of performance characteristics including 5% offset yield strength, capacity and ductility have been examined for tested connections as row spacing varied; their results are addressed herein. Statistical analyses were conducted to determine whether inferences could be made regarding mean values for the ductility ratio, 5% offset yield strength and capacity of tested multiple-bolt connections, as row spacing was increased from 2D to 3D. Bolted connections utilizing three different bolt diameters, four unique connection geometries, and variable row spacing within each connection geometry, were subjected to a displacement controlled loading protocol. The protocol used, which was developed by the CUREE-Caltech Wood frame Project is representative of natural hazard loading. Connections were fabricated in order to achieve specific yield modes based on predictions of the Yield Limit Model in order to determine the validity of this model as row spacing was varied. The primary conclusion drawn from the results of this research addresses the current design recommendation for row spacing in bolted timber connections. The 2001 NDS (AF&PA, 2001) states within the provisions of the Geometry factor (C ) that the minimum row spacing in bolted connections shall be 1.5D. This provision should first, be modified to require minimum row spacing for full design value of 3D. Additionally, a linear reduction should be applied in the same manner as current NDS reductions for end distance and bolt spacing, with minimum row spacing for reduced design value of 1.5D. The predictions provided by the Yield Model were, in many cases, inaccurate. Several factors unaccounted for in the model including end fixity caused by the nut and washer, sliding friction between the members, and bolt tensioning, greatly influence connection yield behavior. The derivation of the model should be expanded to include these factors
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Details
- Title
- Investigation into the effects of variable row spacing in bolted timber connections subjected to reverse cyclic loading
- Creators
- Caleb Jesse Knudson
- Contributors
- J. Daniel Dolan (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; Pullman, Wash. :
- Identifiers
- 99900525004701842
- Language
- English
- Resource Type
- Thesis