Push-Off Tests in the Study of Cyclic Behavior of Interfaces between Concretes Cast at Different Times
Publication: Journal of Structural Engineering
Volume 142, Issue 1
Abstract
The knowledge about the cyclic behavior and effects of fatigue on interfaces between concrete cast at different times, subjected to shear stress, is still very limited. This aspect is particularly relevant in structures subjected to important cyclic loads, such as railway bridges. In this context, first, a brief state of the art on the monotonic and cyclic behavior of interfaces between concretes cast at different times is presented. Then, the test campaign, which was aimed at obtaining experimental support for modeling the behavior of such interfaces, subjected to a high number of load cycles, is described, and the corresponding results are discussed and analyzed in terms of slip and crack opening, stress variations in the monotonic tests, failure mode, and number of resisting load cycles. It was further observed that the number of resisting load cycles increases as the maximum load level decreases. On the basis of this evidence, an experimental curve was set for this type of interface.
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Acknowledgments
The authors acknowledge the financial support of the Portuguese Science and Technology Foundation (FCT) through the Laboratory for the Concrete Technology and Structural Behavior (LABEST) and the Ph.D. Grant SFRH/BD/65111/2009. This work has also been funded by Agência de Inovação, S. A., and Mota-Engil Engenharia e Construção, through the research project Innovative Precast Solutions for High Speed Rail Tracks (SIPAV). Acknowledgments are extended to the Tribology, Vibrations and Industrial Management Unit (CETRIB), and Dr. Ramiro Martins for their material support.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 1 • January 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Oct 10, 2014
Accepted: Jun 2, 2015
Published online: Jul 14, 2015
Discussion open until: Dec 14, 2015
Published in print: Jan 1, 2016
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