Evaluation of a Four-Point Bending-Test Method for Interface Shear Transfer in Concrete Members
Publication: Practice Periodical on Structural Design and Construction
Volume 22, Issue 4
Abstract
Interface shear transfer (IST) is critical for achieving composite behavior in many concrete structures, such as between precast girders and cast-in-place decks. IST capacity has traditionally been tested using a push-off test method, in which direct shear is induced through compression loads placed at the ends of notched test specimens. In this study, a four-point bending test method as proposed by Iosipescu in 1967 was investigated for application to IST. The four-point bending test creates direct shear by strategically placing supports and loads on a beam. Its advantage is that the test specimens are easy to fabricate. In addition, it produces a more uniform stress state at the interface than the interface stress distribution of the push-off test, making the four-point bending test a better representation of the stress state at cast-in-place deck and bridge girder connections. In this study, these two test methods are compared and contrasted through an experimental program and analytical modeling. The conditions under which the proposed test method are similar and distinct from the push-off method are identified.
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Acknowledgments
The authors thank Dr. Thomas Cousins and Glenn Department of Civil Engineering staff members Daniel Metz, Samuel Biemann, and Scott Black for their assistance during the test program. Clemson University graduate students Luay Abo-Alarab, Indika Mapa, Sachin Sreedhara, and Mikayla Bladow are also acknowledged for their assistance with the experimental program.
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Published In
Practice Periodical on Structural Design and Construction
Volume 22 • Issue 4 • November 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Nov 7, 2016
Accepted: Feb 23, 2017
Published online: May 24, 2017
Discussion open until: Oct 24, 2017
Published in print: Nov 1, 2017
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