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UBC Theses and Dissertations
Spring-pins as a timber connector in parallel strand lumber Robertson, Mark
Abstract
The spring pin timber connection was developed by Structurecraft Builders Inc. to meet an architectural need for a high profile project involving a large glass timber facade. Traditionally, bolts would be used for such connections, however these were not acceptable from an architectural standpoint due to the aesthetic statement of the nut and bolt. The spring pin is an "off the shelf" fastener with a compressible diameter so that it fits tightly in the connection hole eliminating the need for highly visible nuts and bolts. Aside from its architectural benefits, the tight-fitting nature of the spring-pin connection has suitable stiffness performance characteristics required for a glass facade. Bolts would have been insufficient because the bolthole tolerance involved would allow for too much slop in the connection posing a hazard to the glazing system. Furthermore, current research has indicated that there is a potential for a strength advantage of tight-fitting pins over bolts with required bolthole tolerances. This thesis examines the strength and stiffness characteristics of these tightfitting pins with ramifications for all tight-fitting pins. A simple Monte-Carlo simulation is presented that provides insight into the effect of bolthole tolerances. The research includes a discussion of the physical testing of the spring-pin connection, and determines the statistical implications of testing twin ended wood connections in which only one end fails. The physical testing is used as tool to determine the fastener stiffness and bearing strength both perpendicular to grain and parallel to grain. Testing is conducted on multiple pin connections, and ultimately on moment connections to reflect the load demands predicted in the structural model. It was found that the spring-pin connection is stiff and strong enough to be used in the facade structural system as a light-duty moment connection. Although the stiffness of the connection is greatly enhanced over tradition bolts, the effect of removing bolthole tolerances on the axial strength of a wood connection is not found to be significant for the connection of interest. The influence of the hole-tolerance is likely to be more profound with brittle connections and diminishes with increased slenderness/ductility of the timber fastener.
Item Metadata
Title |
Spring-pins as a timber connector in parallel strand lumber
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2006
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Description |
The spring pin timber connection was developed by Structurecraft Builders Inc. to meet an architectural need for a high profile project involving a large glass timber facade. Traditionally, bolts would be used for such connections, however these were not acceptable from an architectural standpoint due to the aesthetic statement of the nut and bolt. The spring pin is an "off the shelf" fastener with a compressible diameter so that it fits tightly in the connection hole eliminating the need for highly visible nuts and bolts. Aside from its architectural benefits, the tight-fitting nature of the spring-pin connection has suitable stiffness performance characteristics required for a glass facade. Bolts would have been insufficient because the bolthole tolerance involved would allow for too much slop in the connection posing a hazard to the glazing system. Furthermore, current research has indicated that there is a potential for a strength advantage of tight-fitting pins over bolts with required bolthole tolerances. This thesis examines the strength and stiffness characteristics of these tightfitting pins with ramifications for all tight-fitting pins. A simple Monte-Carlo simulation is presented that provides insight into the effect of bolthole tolerances. The research includes a discussion of the physical testing of the spring-pin connection, and determines the statistical implications of testing twin ended wood connections in which only one end fails. The physical testing is used as tool to determine the fastener stiffness and bearing strength both perpendicular to grain and parallel to grain. Testing is conducted on multiple pin connections, and ultimately on moment connections to reflect the load demands predicted in the structural model. It was found that the spring-pin connection is stiff and strong enough to be used in the facade structural system as a light-duty moment connection. Although the stiffness of the connection is greatly enhanced over tradition bolts, the effect of removing bolthole tolerances on the axial strength of a wood connection is not found to be significant for the connection of interest. The influence of the hole-tolerance is likely to be more profound with brittle connections and diminishes with increased slenderness/ductility of the timber fastener.
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Genre | |
Type | |
Language |
eng
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Date Available |
2010-01-13
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0063280
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2006-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.