Glued Composite Timber-Concrete Beams. I: Interlayer Connection Specimen Tests
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Volume 136, Issue 10
Abstract
The composite interaction in timber-concrete beams is usually achieved with mechanical devices, such as shear connectors or plates driven into the materials. However, this connecting system shows some inherent inconveniences, such as the need for drillings and the limited mechanical improvement owing to interface slip. Using adhesives instead of mechanical connectors might attenuate these drawbacks. However, engineers are hesitant to apply adhesives for structural purposes, mostly because of the different thermohygrometric behavior of the adhesive and the connected material(s). This is particularly concerning timber because its hysteretic response to moisture may cause interface delamination. Therefore, as a preliminary stage for the test of composite beams, an extensive experimental campaign on small-size specimens was performed. The study focused on the shear strength at the interface and the role of some factors. Several series were considered by changing those parameters, and the results were compared. Both prefabricated and cast-on-site concrete specimens were considered. The results show that this system looks suitable for structural application, at least under steady dry conditions.
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Acknowledgments
The writers wish to thank the Portuguese Foundation for Science and Technology (FCT) and the Science and Innovation Operational Program (Grant No. UNSPECIFIEDPOCI 2010), co-financed by the European Union Fund FEDER, for the support provided through the Research Project No. UNSPECIFIEDPOCI/ECM/60089/2004.
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© 2010 ASCE.
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Received: Jul 28, 2009
Accepted: Apr 5, 2010
Published online: Apr 9, 2010
Published in print: Oct 2010
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