Longitudinal Joints with Accelerated Construction Features in Decked Bulb-Tee Girder Bridges: Strut-and-Tie Model and Design Guidelines
Publication: Journal of Bridge Engineering
Volume 18, Issue 5
Abstract
This paper focuses on the development of a strut-and-tie model (STM) that can be used in the design of previously developed longitudinal joints with accelerated construction features. Four joint specimens reinforced with tight bend diameter U-bars and previously tested under bending are summarized here to validate the STM. The validated STM is proposed to calculate the ultimate moments of the joints, which is capable of identifying the most critical parameters and yields safe and consistent predictions. It shows that the joint capacity increases with increasing of the concrete strength and overlap length, and the capacity reaches the maximum value when the U-bar spacing is twice the overlap length. Design recommendations to U-bar spacing, overlap length, diameter of lacer bars, as well as concrete strength of the closure pour material are developed for full-strength joints.
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Acknowledgments
The research reported in this paper has been performed under the National Cooperative Highway Research Program (NCHRP) under the 10-71 project, “Cast-in-Place Reinforced Concrete Connections for Precast Deck Systems.” The authors would like to acknowledge Ken Thomas and Larry Roberts of the Department of Civil and Environmental Engineering at the University of Tennessee at Knoxville (UTK) for their assistance with the laboratory testing. The authors would also like to acknowledge the Scientific Research Foundation of Graduate School of Southeast University (Grant No. YBJJ0921), Jiangsu Civil Engineering Graduate Center for Innovation and Academic Communication Foundation, Scholarship Award for Excellent Doctoral Student of Ministry of Education of China, and the Department of Civil and Environmental Engineering at UTK for sponsoring Z.-Q.H.’s doctoral study.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 18 • Issue 5 • May 2013
Pages: 372 - 379
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Mar 2, 2011
Accepted: Jan 27, 2012
Published online: Jan 31, 2012
Published in print: May 1, 2013
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