Shear Behavior of Precast Concrete Segmental Beams with External Tendons
Publication: Journal of Bridge Engineering
Volume 23, Issue 8
Abstract
Precast concrete segmental beams (PCSBs) with external tendons have become more and more popular all over the world for achieving the advantage of rapid construction. This paper focuses on the effects of shear span-depth ratios, joint types (monolithic, dry, and epoxy), joint number, and joint location on the shear behavior of PCSBs with external tendons. A total of 14 specimens with external tendons were fabricated and tested, which included three monolithic specimens, six segmental specimens with dry joints, and five segmental specimens with epoxy joints. The crack propagation, failure mode, deflection, and stresses of prestressing strands were recorded. It was found that joint location plays an important role in the shear strength of PCSBs with dry joints when compared with monolithic specimens. The failure processes and failure modes of PCSBs were independent of joint types. The experimental results also revealed that the joint number had an effect on the deflection and stress of external tendons. Specifically, the shear behavior of PCSBs with dry joints had no evident difference from that with epoxy joints. The strength of beams with external tendons was predicted using the strut-and-tie model. AASHTO and Chinese codes conservatively predicted the shear strength of PCSBs with external tendons when the shear span-depth ratio was less than 2.5. The actual prestressing force in external tendons can accurately predict the ultimate strength of beams with external tendons at different shear span ratios.
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Acknowledgments
The research presented was sponsored by the Science and Technology grant scheme of the Natural Science Foundation of Guangdong Province in China (2016A030313699); the Science and Technology Planning Project of Guangdong Province (201613050501004); and the Science Foundation of State Key Lab of Subtropical Building Science, South China University of Technology (2016KA03). Visits to Guangdong University of Technology, China, by the fourth author were made possible by the Department of Civil and Environmental Engineering of the University of Tennessee, Knoxville, Tennessee.
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Published In
Journal of Bridge Engineering
Volume 23 • Issue 8 • August 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Jul 19, 2017
Accepted: Dec 28, 2017
Published online: May 17, 2018
Published in print: Aug 1, 2018
Discussion open until: Oct 17, 2018
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