Shear Behavior of Dry Joints with Castellated Keys in Precast Concrete Segmental Bridges
Publication: Journal of Bridge Engineering
Volume 20, Issue 2
Abstract
Precast concrete segmental bridges with dry joints have the advantages of rapid construction speed and low cost. The shear strength and shear behavior of dry joints with castellated keys in precast concrete segmental bridges are still debatable. In this paper, full-scale dry joints with castellated keys were tested under different confining stress levels. The main parameters for tests were the number of keys, the confining stress, the depth in key geometry, and the distance between two keys. For comparison purposes, flat joints, monolithic joints, and joints with steel fibers were also tested. The shear behavior, shear capacity, and crack pattern of the joints were investigated as well. Two crack modes for the single-keyed joints are explicitly proposed. The phenomenon of sequential failure of multikeyed dry joints from the inferior key to the superior one was observed in the tests and verified by finite-element simulation. The experimental results obtained in these tests were compared with the design provisions. A shear failure mechanism of sequential failure for multikeyed dry joints is presented to explain the differences between the test results and the formula used. Based on the new explanation and test results, a reduced coefficient of 0.7 is recommended for the shear strength of three-keyed dry joints. Pending more test data, this conclusion could be extended to the shear strength of multikeyed dry joints to improve the formula.
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Acknowledgments
The research presented was sponsored by a science and technology grant scheme of the Guangdong Provincial Department of Highway and Transportation of China (2011-02-46) and the Guangdong Natural Science Foundation (S2012010009615). Visits to the Guangdong University of Technology, China by the third 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 20 • Issue 2 • February 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Sep 5, 2013
Accepted: May 5, 2014
Published online: May 27, 2014
Published in print: Feb 1, 2015
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