Experimental Behavior of Bridge Beams Retrofitted with Postinstalled Shear Connectors
Publication: Journal of Bridge Engineering
Volume 16, Issue 4
Abstract
A number of older bridges were constructed with floor systems consisting of a noncomposite concrete slab over steel girders. A potentially economical means of strengthening these floor systems is to connect the existing concrete slab and steel girders with postinstalled shear connectors to permit the development of composite action. This paper presents the results of an experimental investigation of this concept. Five large-scale noncomposite beams were constructed, and four of these were retrofitted with postinstalled shear connectors and tested under static load. The retrofitted composite beams were designed as partially composite with a 30% shear connection ratio. A noncomposite beam was also tested as a baseline specimen. Test results showed that the strength and stiffness of existing noncomposite bridge girders can be increased significantly. Further, excellent ductility of the strengthened partially composite girders was achieved by placing the postinstalled shear connectors near zero-moment regions to reduce slip demand on the connectors. The test results also showed that current simplified design approaches commonly used for partially composite beams in buildings provide good predictions of the strength and stiffness of partially composite bridge girders strengthened using postinstalled shear connectors.
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Acknowledgments
The authors gratefully acknowledge the financial support provided for this study by the Texas Department of TransportationTXDOT. The authors extend a special thanks to Jon Kilgore, Clara Carbajal, and Joseph Rohmer of the Texas Department of Transportation for their support, assistance, and advice throughout the entire course of this project. The authors also gratefully acknowledge the contributions of Brad Schaap, Brent Hungerford, Hulya Kayir, and Young Kyu Ju in the earlier phases of this research study. The experiments described here were conducted at the Phil M. Ferguson Structural Engineering Laboratory of the University of Texas at Austin.
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© 2011 American Society of Civil Engineers.
History
Received: Mar 1, 2010
Accepted: Sep 23, 2010
Published online: Sep 27, 2010
Published in print: Jul 1, 2011
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