Experimental and Analytical Investigations of a Timber–Concrete Composite Beam Using a Hardwood Interface Layer
Publication: Journal of Structural Engineering
Volume 145, Issue 7
Abstract
This paper presents a study that examined the use of a new connection system in a prefabricated timber–concrete composite (TCC) beam in which a hardwood layer was glued to the top of a timber web to reinforce a dowel-type connection. Embedment tests highlighted the mechanical advantages associated with the use of Eucalyptus sideroxylon, which had a mean density of . The slip modulus of the proposed connection determined from double shear tests outperformed a prefabricated connection involving dowel connectors and no hardwood layer by 75%. Full-scale testing was undertaken on six beams, with two configurations of shear connectors studied. For each beam, the load-deflection behavior, relative slip between the concrete and timber at each connector, and strain profile at the midspan were measured. A simulation model was developed from which a parametric analysis was undertaken. Composite action of 81.9% was achieved when the minimum spacing was used. Using the -method as a design guideline is recommended. This connection system avoided the additional labor associated with using notches or adhesive at the interface and was easily fabricated.
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Acknowledgments
Sincere gratitude is expressed to Mr. Mark Byrami and Mr. Ross Reichardt from the materials laboratory, The University of Auckland, for their help in fabricating and testing the full-scale beams. The authors would like to thank The University of Auckland undergraduate students who did the shear test as their final-year project. In addition, the authors are grateful to Nelson Pine Industries Limited for supplying the LVL material at reduced cost and Momentive Specialty Chemicals Limited for donating the adhesive.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 7 • July 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Feb 19, 2018
Accepted: Nov 15, 2018
Published online: Apr 26, 2019
Published in print: Jul 1, 2019
Discussion open until: Sep 26, 2019
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