Punching Shear Behavior of Externally Prestressed Concrete Slabs
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Volume 137, Issue 1
Abstract
The use of externally post-tensioned fiber-reinforced concrete decks in highway bridge structures is seen as a viable option in the move toward the design and construction of high-performance structures. However, with the thin unreinforced deck slabs that may result, punching shear is a potential concern. An experimental program is described in which the punching shear behavior of externally prestressed slabs is investigated, both with plain and fiber-reinforced concrete specimens. Results indicate that significant improvements in strength, ductility, energy absorption and nonbrittleness of failure can be achieved with fiber reinforcement. Nonlinear finite-element analysis procedures are used to model the specimens, and reasonably accurate simulations of behavior are obtained. Design code procedures are found to be unconservative in estimating the punching shear strength of these elements, whereas a commonly used analytical model is found to be overly conservative.
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Acknowledgments
The writers gratefully acknowledge the financial support of the Cement Association of Canada and the Natural Sciences and Engineering Research Council of Canada. Specimen P-2a was constructed and tested by Mr. Jamie McIntyre as part of his Master’s thesis.
References
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© 2011 ASCE.
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Received: May 31, 2010
Accepted: Jul 10, 2010
Published online: Dec 15, 2010
Published in print: Jan 2011
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