Strength of Cement Bonded Steel Connections in Glue Laminated Timber

Type of content
Publisher's DOI/URI
Thesis discipline
Degree name
Master of Engineering
Publisher
University of Canterbury. Civil Engineering
Journal Title
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Language
Date
1999
Authors
Eistetter, Sabine
Abstract

The use of epoxy bonded steel connections is gaining increasing acceptance not only in New Zealand but worldwide, due to ongoing research and development. Of concern is the fire resistance, as it has been observed that heat affects the strength of epoxy and consequently the pull out strength of the connection. This report presents an investigation of the use of cement grout for bonded steel connections in glue laminated timber. It is intended to make cement grout a possible adhesive alternative to epoxy for bonded steel connections, with regard to better fire resistance. Small sized tests of wood and cement were carried out. In the study, ten various designs of the connection with variables of embedment length, hole geometry and reinforcement were tested in tension to find out their effect on the pull out strength of the connection. The results show that the bond between timber and cement is the main problem due to the fact that cement does not bond to timber. To prevent the steel-cement block from pulling out, tests were carried out using additional screws and bolts, which increased the strength significantly, compared to connections with straight holes. A minor increase of load capacity was achieved in connections with a distinct key between the cement and the wood. An equation was developed to predict the strength of connections using screws or bolts as reinforcement.

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Ngā upoko tukutuku/Māori subject headings
ANZSRC fields of research
Fields of Research::40 - Engineering::4005 - Civil engineering::400504 - Construction engineering
Field of Research::09 - Engineering::0905 - Civil Engineering::090599 - Civil Engineering not elsewhere classified
Rights
Copyright Sabine Eistetter